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Journal articles on the topic 'Ethynyl ketone'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Yavari, Issa, Abdolali Alizadeh, and Mohammad Anary-Abbasinejad. "Stable 1,3-Diionic Organophosphorus Compounds Derived from Ethynyl Phenyl Ketone." Phosphorus, Sulfur, and Silicon and the Related Elements 177, no. 1 (January 1, 2002): 81–86. http://dx.doi.org/10.1080/10426500210236.

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2

Sun, Yin-wei, Qin Xu, and Min Shi. "Gold-catalyzed reaction of oxabicyclic alkenes with electron-deficient terminal alkynes to produce acrylate derivatives." Beilstein Journal of Organic Chemistry 9 (October 1, 2013): 1969–76. http://dx.doi.org/10.3762/bjoc.9.233.

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Oxabicyclic alkenes can react with electron-deficient terminal alkynes in the presence of a gold catalyst under mild conditions, affording the corresponding addition products in moderate yields. When using alkynyl esters as substrates, the (Z)-acrylate derivatives are obtained. Using but-3-yn-2-one (ethynyl ketone) as a substrate, the corresponding addition product is obtained with (E)-configuration. The proposed mechanism of these reactions is also discussed.

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3

Wilbur, J. M., and B. A. Bonner. "Synthesis of hydrogen-terminated aliphatic bis(ethynyl ketone)s and aliphatic poly(enamine-ketone)s and poly(enonesulfide)s." Journal of Polymer Science Part A: Polymer Chemistry 28, no. 13 (December 1990): 3747–59. http://dx.doi.org/10.1002/pola.1990.080281318.

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4

TIWARI, R. K., A. K. SAXENA, and P. S. VENKATARAMANI. "ChemInform Abstract: Nucleophilic Addition to Aryl Ethynyl Ketone: Addition of Oxygen Containing Nucleophiles to Terephthaloyl Acetylene." ChemInform 28, no. 13 (August 4, 2010): no. http://dx.doi.org/10.1002/chin.199713065.

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5

Yavari, Issa, Mohammad Anary-Abbasinejad, and Abdolali Alizadeh. "On the Reaction between Alkyl Isocyanides and Ethynyl Phenyl Ketone in the Presence of N,N′-Dimethylbarbituric Acid." Monatshefte f?r Chemie / Chemical Monthly 133, no. 9 (September 1, 2002): 1221–24. http://dx.doi.org/10.1007/s007060200093.

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6

He, QinZheng, JinYan Wang, LiShuai Zong, Rui Liu, and XiGao Jian. "Soluble and crosslinkable poly(phthalazinone ether ketone)s with pendent terminal ethynyl groups: synthesis, characterization and click modification." Polymer International 64, no. 7 (January 12, 2015): 875–83. http://dx.doi.org/10.1002/pi.4860.

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7

Yavari, Issa, Mohammad Anary-Abbasinejad, and Abdolali Alizadeh. "On the Reaction Between Alkyl Isocyanides and Ethynyl Phenyl Ketone in the Presence of N,N′-Dimethylbarbituric Acid." ChemInform 34, no. 1 (January 7, 2003): no. http://dx.doi.org/10.1002/chin.200301154.

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8

Lee, Hyung-Jong, Myung-Hyun Lee, Min-Cheol Oh, Joo-Heon Ahn, and Seon Gyu Han. "Crosslinkable polymers for optical waveguide devices. II. Fluorinated ether ketone oligomers bearing ethynyl group at the chain end." Journal of Polymer Science Part A: Polymer Chemistry 37, no. 14 (July 15, 1999): 2355–61. http://dx.doi.org/10.1002/(sici)1099-0518(19990715)37:14<2355::aid-pola9>3.0.co;2-9.

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9

Mukaiyama, Teruaki, Shigekazu Matsui, Koichi Homma, and Sh\={u} Kobayashi. "Regioselective Condensation of Ethynyl Vinyl Ketone or 2-Propynyl Ether Derivatives with Silyl Enol Ethers Catalyzed by Trityl Perchlorate." Bulletin of the Chemical Society of Japan 63, no. 9 (September 1990): 2687–90. http://dx.doi.org/10.1246/bcsj.63.2687.

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10

MUKAIYAMA, T., S. MATSUI, K. HOMMA, and S. KOBAYASHI. "ChemInform Abstract: Regioselective Condensation of Ethynyl Vinyl Ketone or 2-Propynyl Ether Derivatives with Silyl Enol Ethers Catalyzed by Trityl Perchlorate." ChemInform 22, no. 4 (August 23, 2010): no. http://dx.doi.org/10.1002/chin.199104110.

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11

Giridhar Reddy, P., K. Ramesh, S. Shylaja, K. C. Rajanna, and S. Kandlikar. "Ru (III) Catalyzed Oxidation of Aliphatic Ketones by N-Bromosuccinimide in Aqueous Acetic Acid: A Kinetic Study." Scientific World Journal 2012 (2012): 1–7. http://dx.doi.org/10.1100/2012/456516.

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Kinetics of Ru (III) catalyzed oxidation of aliphatic ketones such as acetone, ethyl methyl ketone, diethyl ketone, iso-butylmethyl ketone by N-bromosuccinimide in the presence of Hg(II) acetate have been studied in aqueous acid medium. The order of [N-bromosuccinimide] was found to be zero both in catalyzed as well as uncatalyzed reactions. However, the order of [ketone] changed from unity to a fractional one in the presence of Ru (III). On the basis of kinetic features, the probable mechanisms are discussed and individual rate parameters evaluated.

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12

Liu, Hsing-Jang, Waiseng Martin Feng, Jeung Bea Kim, and Eric N. C. Browne. "Lewis acid catalyzed Diels–Alder reactions of two useful dienyl phosphate esters." Canadian Journal of Chemistry 72, no. 10 (October 1, 1994): 2163–75. http://dx.doi.org/10.1139/v94-275.

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The Lewis acid catalyzed Diels–Alder reactions of dienyl phosphate esters 1 and 2 were examined. 2-Diethylphosphoryloxy-1,3-butadiene (1) was found to react with a variety of α,β-unsaturated carbonyl compounds under Lewis acid catalysis with excellent regioselectivity to give synthetically useful cyclohexene derivatives. The adducts were produced in accordance with the normal rules governing the Diels–Alder addition. In the presence of stannic chloride acyclic α,β-unsaturated ketones such as ethyl vinyl ketone and methyl vinyl ketone reacted rapidly with diene phosphate 1 to give exclusively the para-addition products 8 and 9 in excellent yields. When diene 1 was treated with the complex cyclic enone ester 14 in the presence of ferric chloride the single para-rule adduct 15 was obtained in good yield. The stannic chloride catalyzed Diels–Alder reactions of trans-2-diethylphosphoryloxy-1,3-pentadiene (2) were also studied. Diene phosphate 2 reacted efficiently with a number of acyclic α,β-unsaturated ketones such as methyl vinyl ketone, ethyl vinyl ketone, and trans-3-penten-2-one with complete regio- and stereoselectivity to give single cyclohexene derivatives 38, 39, and 40.

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13

Chen, Chan Cheng, Tsung Han Han, Sheng Xiang Hong, and Der Jen Hsu. "Auto-Ignition Temperature Data for Selected Ketones." Advanced Materials Research 560-561 (August 2012): 145–51. http://dx.doi.org/10.4028/www.scientific.net/amr.560-561.145.

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Auto-ignition temperature (AIT) is usually defined as the lowest temperature at which a substance will produce hot-flame ignition in air at atmospheric pressure without the aid of an external energy source such as spark or flame. Its principal applications include: defining the maximum acceptable surface temperature in a particular area, usually for electrical classification purpose, to prevent fire and explosion hazards; determining the possible hazardous consequence associated with leakage of flammable chemicals in risk assessment methods. Although AIT is indispensable for safely handling and operating flammable substance, the AITs data are, however, very much diverse in different data compilations. In present work the AITs of three ketones are measured in compliance with the ASTM E659 test method. The measured AITs are (461.7 ± 9.2) °C, (397.8 ± 8.0) °C and (399.0 ± 8.0) °C for Methyl Ethyl Ketone, Methyl Isoamyl Ketone and 2-Heptanone, respectively. It is found that the AIT compiled in DIPPR 2009 is beyond the experimental reproducibility in Methyl Ethyl Ketone and Methyl Isoamyl Ketone, and the difference is found to be of 54 °C and 207 °C and 6 °C for Methyl Ethyl Ketone Methyl and Isoamyl Ketone, respectively. The AIT reported in The Chemical Database also deviates from that obtained in present work with certain degree, and the difference is found to be of 54 °C, 57 °C and 133 °C for Methyl Ethyl Ketone, Methyl Isoamyl Ketone and 2- Heptanone, respectively.

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14

Stephenson, W. Kirk, and Richard Fuchs. "Enthalpies of interaction of ketones with organic solvents." Canadian Journal of Chemistry 63, no. 2 (February 1, 1985): 336–41. http://dx.doi.org/10.1139/v85-057.

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Enthalpies of solution (ΔHS) of a series of ketones (acetone, 2-butanone, 2-heptanone, 2-nonanone, 5-nonanone, 2,2,4,4-tetramethyl-3-pentanone, cyclohexanone) and alkane model compounds (n-heptane, n-nonane, 2,2,4,4-tetramethylpentane, cyclohexane) have been determined in 17 organic solvents (n-heptane, cyclohexane, CCl4, α,α,α,-trifluorotoluene, 1,2-dichloroethane, triethylamine, butyl ether, ethyl acetate, DMF, DMSO, benzene, toluene, mesitylene, 1-octanol, methanol, t-butyl alcohol, 2,2,2-trifluoroethanol), and combined with heats of vaporization to give enthalpies of transfer from vapor to solvent (ΔH(v → S)). These values have been used to evaluate ketone–solvent polar interactions (ΔΔH(v → S) = ΔH(v → S)(ketone) − ΔH(v → S)(alkane)). The linear relationships between ΔΔH(v → S) and solvent dipolarity-polarizability (Taft-Kamlet π* parameters) are derived. Based on the deviations from these correlations, ketone–CF3CH2OH enthalpies of hydrogen bond formation have been evaluated. The other alcohol solvents show no evidence of exothermic H-bond formation with ketones.

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15

Nakatani, Kazuhiko, Akimitsu Okamoto, Mikito Yamanuki, and Isao Saito. "Highly Efficient Synthesis of 2-Substituted 4H-Chromen-4-ones by means of F--Induced 6-Endo-Digonal Cyclization of o-(Silyloxy)phenyl Ethynyl Ketone Derivatives." Journal of Organic Chemistry 59, no. 16 (August 1994): 4360–61. http://dx.doi.org/10.1021/jo00095a003.

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16

Sivak, Jacob G., Kelley L. Herbert, and Anne L. Baczmanski. "The Use of the Cultured Bovine Lens to Measure the In Vitro Ocular Irritancy of Ketones and Acetates." Alternatives to Laboratory Animals 23, no. 5 (September 1995): 689–98. http://dx.doi.org/10.1177/026119299502300522.

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A novel in vitro alternative to in vivo eye toxicity testing measures the optical response (focal variability) of the cultured bovine lens (obtained from abattoirs) in response to exposure to potentially toxic chemicals. This approach involves measuring the optical quality of the lens by using a scanning laser system consisting of a low power scanning laser, a video camera and a video frame digitiser. This test was used to provide a rank order for the toxicity of four acetates (cellosolve acetate, ethyl acetate, methyl acetate and n-butyl acetate) and four ketones (methyl ethyl ketone, methyl isobutyl ketone, acetone and methyl amyl ketone) based on the time taken to produce a 100% increase in lens focal variability. The results indicate that the cultured lens is very sensitive to chemical damage. In particular, the test provides a much wider range of end values than does the in vivo test, especially at low concentrations.

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17

NAKATANI, K., A. OKAMOTO, M. YAMANUKI, and I. SAITO. "ChemInform Abstract: Highly Efficient Synthesis of 2-Substituted 4H-Chromen-4-ones by Means of F--Induced 6-endo-digonal Cyclization of o-(Silyloxy)phenyl Ethynyl Ketone Derivatives." ChemInform 26, no. 6 (August 18, 2010): no. http://dx.doi.org/10.1002/chin.199506150.

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18

Andraos, J., Y. Chiang, S. J. Eustace, A. J. Kresge, S. W. Paine, V. V. Popik, and K. Sung. "Article." Canadian Journal of Chemistry 77, no. 4 (April 1, 1999): 459–62. http://dx.doi.org/10.1139/v99-058.

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Five ketenes, phenyl(ethyl)ketene, phenyl(methylthio)ketene, diphenylketene, pentafluorophenylketene, and 1-naphthylketene, were generated flash photolytically and solvent isotope effects (H2O vs. D2O) on their hydroxide-ion-catalyzed hydration in aqueous solution were determined. The values obtained are all weakly inverse and closely similar (kHO/kDO = 0.76-0.97), as expected for these fast, hydroxide-ion-consuming reactions, known to proceed by nucleophilic attack of hydroxide on the ketene carbonyl group. The characteristic magnitude of these isotope effects should prove useful in identifying new examples of this reaction.Key words: ketenes, flash photolysis, photo-Wolff reaction, solvent isotope effects on hydroxide ion consumption.

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19

Sommariva, R., J. A. de Gouw, M. Trainer, E. Atlas, P. D. Goldan, W. C. Kuster, C. Warneke, and F. C. Fehsenfeld. "Emissions and photochemistry of oxygenated VOCs in urban plumes in the Northeastern United States." Atmospheric Chemistry and Physics Discussions 8, no. 3 (June 30, 2008): 12371–408. http://dx.doi.org/10.5194/acpd-8-12371-2008.

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Abstract. Photochemical processes inside urban plumes in the Northeast of the United States have been studied using a highly detailed chemical model, based upon the Master Chemical Mechanism (MCM). The model results have been compared to measurements of oxygenated VOCs (acetone, methyl ethyl ketone, acetaldehyde, acetic acid and methanol) obtained during several flights of the NOAA WP-3D aircraft, which sampled plumes from the New York City area during the ICARTT campaign in 2004. The agreement between the model and the measurements was within 40–60% for all species, except acetic acid. The model results have been used to study the formation and photochemical evolution of acetone, methyl ethyl ketone and acetaldehyde. Under the conditions encountered during the ICARTT campaign, acetone is produced from the oxidation of propane (24–28%) and i-propanol (<15%) and from a number of products of i-pentane oxidation. Methyl ethyl ketone (MEK) is mostly produced from the oxidation of n-butane (20–30%) and 3-methylpentane (<40%). Acetaldehyde is formed from several precursors, mostly small alkenes, >C5 alkanes, propanal and MEK. Ethane and ethanol oxidation account, respectively, for 6–23% and 5–25% of acetaldehyde photochemical formation. The results highlight the importance of long-chain alkanes for the photochemical production of ketones and the role of hydroperoxides in sustaining their formation far from the emission sources.

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20

Sommariva, R., J. A. de Gouw, M. Trainer, E. Atlas, P. D. Goldan, W. C. Kuster, C. Warneke, and F. C. Fehsenfeld. "Emissions and photochemistry of oxygenated VOCs in urban plumes in the Northeastern United States." Atmospheric Chemistry and Physics 11, no. 14 (July 21, 2011): 7081–96. http://dx.doi.org/10.5194/acp-11-7081-2011.

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Abstract. Photochemical processes inside urban plumes in the Northeast of the United States have been studied using a highly detailed chemical model, based upon the Master Chemical Mechanism (MCM). The model results have been compared to measurements of oxygenated VOCs (acetone, methyl ethyl ketone, acetaldehyde, acetic acid and methanol) obtained during several flights of the NOAA WP-3D aircraft, which sampled plumes from the New York City area during the ICARTT campaign in 2004. The agreement between the model and the measurements was within 40–60 % for all species, except acetic acid. The model results have been used to study the formation and photochemical evolution of acetone, methyl ethyl ketone and acetaldehyde. Under the conditions encountered during the ICARTT campaign, acetone is produced from the oxidation of propane (24–28 %) and i-propanol (<15 %) and from a number of products of i-pentane oxidation. Methyl ethyl ketone (MEK) is mostly produced from the oxidation of n-butane (20–30 %) and 3-methylpentane (<40 %). Acetaldehyde is formed from several precursors, mostly small alkenes, >C5 alkanes, propanal and MEK. Ethane and ethanol oxidation account, respectively, for 6–23 % and 5–25 % of acetaldehyde photochemical formation. The results highlight the importance of alkanes for the photochemical production of ketones and the role of hydroperoxides in sustaining their formation far from the emission sources.

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21

Park, Hoey Kyung, June-shu Ahn, and Jungho Cho. "Simulation Study of Methyl ethyl ketone-Cyclohexane Azeotrope on the Pressure-Swing Distillation." Journal of the Korea Academia-Industrial cooperation Society 17, no. 3 (March 31, 2016): 708–15. http://dx.doi.org/10.5762/kais.2016.17.3.708.

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22

MaGee, David I., Mahesh Ramaseshan, and James D. Leach. "Synthesis of cyclic and acyclic imides, sulfonimides, and N-carbobenzyloxyamides by ketene trapping." Canadian Journal of Chemistry 73, no. 12 (December 1, 1995): 2111–18. http://dx.doi.org/10.1139/v95-260.

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A convenient and general method for the synthesis of cyclic and acyclic imides, sulfonimides, and N-benzyloxycarbonyl amides via the inter-and intramolecular trapping of ketenes has been developed. Heating the corresponding amido, sulfonamido, and carbamamido ethyl ethynyl ethers at 150 °C for 3 h produced the desired compounds in good to excellent yields. Keywords: ketenes, imides, sulfonimides, N-benzyloxycarbonyl amides.

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23

Chun, Stephanie W., and Alison R. H. Narayan. "Biocatalytic Synthesis of α-Amino Ketones." Synlett 30, no. 11 (March 19, 2019): 1269–74. http://dx.doi.org/10.1055/s-0037-1611755.

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Stereospecific generation of α-amino ketones from common α-amino acids is difficult to achieve, often employing superstoichiometric alkylating reagents and requiring multiple protecting group manipulations. In contrast, the α-oxoamine synthase protein family performs this transformation stereospecifically in a single step without the need for protecting groups. Herein, we detail the characterization of the 8-amino-7-oxononanoate synthase (AONS) domain of the four-domain polyketide-like synthase SxtA, which natively mediates the formation of the ethyl ketone derivative of arginine. The function of each of the four domains is elucidated, leading to a revised proposal for the initiation of saxitoxin biosynthesis, a potent neurotoxin. We also demonstrate the synthetic potential of SxtA AONS, which is applied to the synthesis of a panel of novel α-amino ketones.1 Introduction2 Native SxtA Module Activity3 New Reactions with SxtA AONS4 Conclusions and Outlook

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24

Kam, Sang-Kyu, Jin-Woo Jeon, and Min-Gyu Lee. "Effect of Methyl Ethyl Ketone and Ethyl Acetate Vapor on Photocatalytic Decomposition of n-Pentane Vapor." Journal of Environmental Science International 23, no. 6 (June 30, 2014): 1151–56. http://dx.doi.org/10.5322/jesi.2014.23.6.1151.

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25

Al-Auda, Zahraa, Hayder Al-Atabi, and Keith Hohn. "Metals on ZrO2: Catalysts for the Aldol Condensation of Methyl Ethyl Ketone (MEK) to C8 Ketones." Catalysts 8, no. 12 (December 5, 2018): 622. http://dx.doi.org/10.3390/catal8120622.

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Methyl ethyl ketone (MEK) was converted to heavier ketones in one step, using a multi-functional catalyst having both aldol condensation (aldolization and dehydration) and hydrogenation properties. 15% Cu supported zirconia (ZrO2) was investigated in the catalytic gas phase reaction of MEK in a fixed bed reactor. The results showed that the main product was 5-methyl-3-heptanone (C8 ketone), with side products including 5-methyl-3-heptanol, 2-butanol, and other heavy products (C12 and up). The effects of various reaction parameters, like temperature and molar ratio of reactants (H2/MEK), on the overall product selectivity were studied. It was found that with increasing the temperature of the reaction, the selectivity to the C8 ketone increased, while selectivity to the 2-butanol decreased. Also, hydrogen pressure played a significant role in the selectivity of the products. It was observed that with increasing the H2/MEK molar ratio, the 2-butanol selectivity increased because of the hydrogenation reaction, while decreasing this ratio led to increasing the aldol condensation products. In addition, it was noted that both the conversion and selectivity to the main product increased using a low loading percentage of copper, 1% Cu–ZrO2. The highest selectivity of 5-methyl-3-heptanone reached ~64%, and was obtained at a temperature of around 180 °C and a molar ratio of H2/MEK equal to 2. Other metals (Ni, Pd, and Pt) that were supported on ZrO2 also produced 5-methyl-3-heptanone as the main product, with slight differences in selectivity, suggesting that a hydrogenation catalyst is important for producing the C8 ketone, but that the exact identity of the metal is less important.

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26

Penner, Glenn H. "Conformational preference and internal rotation about the C1—Cα bond in phenylacetaldehyde and some benzyl alkyl ketones from 1H nuclear magnetic resonance and abinitio molecular orbital calculations." Canadian Journal of Chemistry 65, no. 3 (March 1, 1987): 538–40. http://dx.doi.org/10.1139/v87-094.

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Analysis of the 1H nuclear magnetic resonance spectra of the benzyl moieties in phenylacetaldehyde, benzyl methyl ketone, benzyl ethyl ketone, benzyl isopropyl ketone, and 3,5-dichlorobenzyl tert-butyl ketone yields the long-range couplings between ring and α protons. These stereospecific couplings change very little upon replacement of the aldehydic hydrogen by various alkyl groups. The couplings for all the molecules studied fall within the ranges 4J(CH2, Ho) = −0.566 ± 0.008 Hz, 5J(CH2, Hm) = 0.278 ± 0.002 Hz, and 6J(CH2, Hp) = −0.409 ± 0.010 Hz, suggesting that in the ketones the alkyl group prefers to be trans to the phenyl ring and does not interfere with rotation about the C1—Cα bond. The long-range couplings are consistent with a potential function V(θ) = 8.4 ± 1.2 sin2 θ for two-fold rotation about the C1—Cα bond; θ is the angle between the carbonyl and benzene ring plane. Abinitio molecular orbital calculations on phenylacetaldehyde at the STO-3G level with the C=O bond cis to the phenyl group yield a potential of V(θ) = (8.65 ± 0.73) sin2 θ + (1.27 ± 0.80) sin2 2θ, rather close to the experimental potential but with a small fourfold component. The spin–spin coupling constant between the aldehydic and α protons displays a solvent dependence consistent with previously reported values. The insensitivity of 4J(CH2, Ho), 5J(CH2, Hm), and 6J(CH2, Hp) to solvent suggests that [Formula: see text] is very weakly dependent on the rotation of the aldehyde group.

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27

Suggs, J. William, and Chul-Ho Jun. "Metal-catalysed alkyl ketone to ethyl ketone conversions in chelating ketones via carbon–carbon bond cleavage." J. Chem. Soc., Chem. Commun., no. 2 (1985): 92–93. http://dx.doi.org/10.1039/c39850000092.

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28

Yamabe, Shinichi, Guixiang Zeng, Wei Guan, and Shigeyoshi Sakaki. "Substrate dependent reaction channels of the Wolff–Kishner reduction reaction: A theoretical study." Beilstein Journal of Organic Chemistry 10 (January 23, 2014): 259–70. http://dx.doi.org/10.3762/bjoc.10.21.

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Wolff–Kishner reduction reactions were investigated by DFT calculations for the first time. B3LYP/6-311+G(d,p) SCRF=(PCM, solvent = 1,2-ethanediol) optimizations were carried out. To investigate the role of the base catalyst, the base-free reaction was examined by the use of acetone, hydrazine (H2N–NH2) and (H2O)8. A ready reaction channel of acetone → acetone hydrazine (Me2C=N–NH2) was obtained. The channel involves two likely proton-transfer routes. However, it was found that the base-free reaction was unlikely at the N2 extrusion step from the isopropyl diimine intermediate (Me2C(H)–N=N–H). Two base-catalyzed reactions were investigated by models of the ketone, H2N–NH2 and OH−(H2O)7. Here, ketones are acetone and acetophenone. While routes of the ketone → hydrazone → diimine are similar, those from the diimines are different. From the isopropyl diimine, the N2 extrusion and the C–H bond formation takes place concomitantly. The concomitance leads to the propane product concertedly. From the (1-phenyl)ethyl substituted diimine, a carbanion intermediate is formed. The para carbon of the phenyl ring of the anion is subject to the protonation, which leads to a 3-ethylidene-1,4-cyclohexadiene intermediate. Its [1,5]-hydrogen migration gives the ethylbenzene product. For both ketone substrates, the diimines undergoing E2 reactions were found to be key intermediates.

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29

L. Morgan, Sandra M. Ward, Ralph E., Daniel. "INHALATION TOXICITY STUDIES OF THE α,β-UNSATURATED KETONES: Ethyl Vinyl Ketone." Inhalation Toxicology 13, no. 8 (January 2001): 633–58. http://dx.doi.org/10.1080/08958370126864.

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30

Morgan, Daniel L., Sandra M. Ward, Ralph E. Wilson, Herman C. Price, Robert W. O'Connor, John C. Seely, and Michael L. Cunningham. "INHALATION TOXICITY STUDIES OF THE α,β-UNSATURATED KETONES: Ethyl Vinyl Ketone." Inhalation Toxicology 13, no. 8 (August 1, 2001): 633–58. http://dx.doi.org/10.1080/08958370152409883.

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31

Šindelář, Karel, Jiří Holubek, Oluše Matoušová, Emil Svátek, Martin Valchář, Antonín Dlabač, Nataša Dlohožková, Marta Hrubantová, and Miroslav Protiva. "Aminoalkylidene and aminoalkyl derivatives of 6,11-dihydrodibenzo[b,e]thiepin-2- and -9-carbonitrile and 4,10-dihydrothieno[2,3-c]-1-benzothiepin-6-carbonitrile; Antidepressants with a new activity profile." Collection of Czechoslovak Chemical Communications 53, no. 2 (1988): 340–60. http://dx.doi.org/10.1135/cccc19880340.

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Starting from the bromo ketones VIIc, XIII, and XXIV and proceeding via the alcohols VIIIc, IXc, XIV, XVII, and XXVI, the olefinic compounds IIc (+ VI), Xc (+XI), XVc and XIXc(+XXc), and the saturated compound XVIc were prepared. The pairs of geometrical isomers were separated by crystallization of salts and the individual compounds Iic, Xc, XVc, XVIc, XIXc, and XXc were transformed by treatment with cuprous cyanide in hexamethylphosphoric triamide to the corresponding cyano compounds IIb, Xb, XVb, XVIb, XIXb, and XXb. Compound IIb was synthesized also from the ketone VIIc via the cyano ketone VIIb and the cyano carbinol VIIIb. The secondary amine IIIb was prepared from IIc by partial demethylation with ethyl chloroformate, the following hydrolysis to IIIc, protection of NH group with butyrolactone, the following treatment with cuprous cyanide, and deprotection by mild hydrolysis. The title compounds, which are the cyano analogues of antidepressants of the prothiadene series, showed in pharmacological and biochemical tests properties of potential antidepressants and more or less selective inhibitors of the 5-hydroxytryptamine uptake in the rat brain; at the same time they are rather strong central cholinolytics.

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32

Bonilla-Landa, Israel, Emizael López-Hernández, Felipe Barrera-Méndez, Nadia C. Salas, and José L. Olivares-Romero. "Hafnium(IV) Chloride Catalyzes Highly Efficient Acetalization of Carbonyl Compounds." Current Organic Synthesis 16, no. 6 (November 26, 2019): 913–20. http://dx.doi.org/10.2174/1570179416666190715100505.

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Background: Hafnium(IV) tetrachloride efficiently catalyzes the protection of a variety of aldehydes and ketones, including benzophenone, acetophenone, and cyclohexanone, to the corresponding dimethyl acetals and 1,3-dioxolanes, under microwave heating. Substrates possessing acid-labile protecting groups (TBDPS and Boc) chemoselectively generated the corresponding acetal/ketal in excellent yields. Aim and Objective: In this study. the selective protection of aldehydes and ketones using a Hafnium(IV) chloride, which is a novel catalyst, under microwave heating was observed. Hence, it is imperative to find suitable conditions to promote the protection reaction in high yields and short reaction times. This study was undertaken not only to find a novel catalyst but also to perform the reaction with substrates bearing acid-labile protecting groups, and study the more challenging ketones as benzophenone. Materials and Methods: Using a microwave synthesis reactor Monowave 400 of Anton Paar, the protection reaction was performed on a raging temperature of 100°C ±1, a pressure of 2.9 bar, and an electric power of 50 W. More than 40 substrates have been screened and protected, not only the aldehydes were protected in high yields but also the more challenging ketones such as benzophenone were protected. All the products were purified by simple flash column chromatography, using silica gel and hexanes/ethyl acetate (90:10) as eluents. Finally, the protected substrates were characterized by NMR 1H, 13C and APCI-HRMS-QTOF. Results: Preliminary screening allowed us to find that 5 mol % of the catalyst is enough to furnish the protected aldehyde or ketone in up to 99% yield. Also it was found that substrates with a variety of substitutions on the aromatic ring (aldehyde or ketone), that include electron-withdrawing and electrondonating group, can be protected using this methodology in high yields. The more challenging cyclic ketones were also protected in up to 86% yield. It was found that trimethyl orthoformate is a very good additive to obtain the protected acetophenone. Finally, the protection of aldehydes with sensitive functional groups was performed. Indeed, it was found that substrates bearing acid labile groups such as Boc and TBDPS, chemoselectively generated the corresponding acetal/ketal compound while keeping the protective groups intact in up to 73% yield. Conclusion: Hafnium(IV) chloride as a catalyst provides a simple, highly efficient, and general chemoselective methodology for the protection of a variety of structurally diverse aldehydes and ketones. The major advantages offered by this method are: high yields, low catalyst loading, air-stability, and non-toxicity.

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33

Zhuchkov, V. I., S. L. Nazansky, O. N. Krupinova, and A. K. Frolkova. "VAPOUR-LIQUID EQUILIBRIUM IN SYSTEMS WITH ISOBUTYL ACETATE, ACETIC ACID AND METHYL ETHYL KETONE." Fine Chemical Technologies 11, no. 2 (April 28, 2016): 38–45. http://dx.doi.org/10.32362/2410-6593-2016-11-2-38-45.

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The experimental temperature dependence of the vapour pressures of isobutyl acetate, acetic acid and methyl ethyl ketone were determined, and isobaric vapour-liquid equilibrium data of binary systems of methyl ethyl ketone + isobutyl acetate and methyl ethyl ketone + acetic acid were obtained. The experimental data were processed using the Antoine and Riedel equations and the NRTL and Wilson local composition equations, respectively. Comparison of the experimental and calculated data confirmed the adequacy of the vapour-liquid equilibrium mathematical simulation.

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34

Dransfield, R. D., R. Brightwell, M. F. Chaudhury, T. K. Golder, and S. A. R. Tarimo. "The use of odour attractants for sampling Glossina pallidipes Austen(Diptera: Glossinidae) at Nguruman, Kenya." Bulletin of Entomological Research 76, no. 4 (December 1986): 607–19. http://dx.doi.org/10.1017/s000748530001511x.

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AbstractVarious ketones and 1-octen-3-ol were used as odour attractants with biconical traps at Nguruman, south-western Kenya, to assess their effects on the catch size and composition of Glossina pallidipes Austen. Acetone, methyl ethyl ketone and 1-octen-3-ol were found to be effective in increasing catch size by up to 2–4×, but the two ketones differed in their dose-response curves. Acetone was more effective for males than females, as was 1-octen-3-ol. The age composition of samples from baited and unbaited traps differed only slightly. The level of variability between traps was reduced by the use of odour. Acetone with cow urine produced increases in catch of 9–25×, and significant differences were found between samples in sex ratio and age composition. The index of increase for cow urine plus acetone, when used with a biconical trap, was correlated with temperature changes during the day. This could only be partially accounted for by variability in dose rates. Cow urine with acetone is considered to be a potentially useful combination of baits for community participation tsetse control schemes.

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35

Glowacz-Czerwonka, Dorota. "Oligoetherols with S-Trazine Ring Based on Hydroxymethyl Derivatives of Methyl Ethyl Ketone." Chemistry & Chemical Technology 11, no. 1 (March 15, 2017): 45–48. http://dx.doi.org/10.23939/chcht11.01.045.

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36

Liu, Baoxiang, Yang Yang, Likun Ren, Zhengbo Su, Xin Bian, Jing Fan, Yuanyuan Wang, Bing Han, and Na Zhang. "HS-GC-IMS and PCA to Characterize the Volatile Flavor Compounds in Three Sweet Cherry Cultivars and Their Wines in China." Molecules 27, no. 24 (December 19, 2022): 9056. http://dx.doi.org/10.3390/molecules27249056.

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The aim of this research was to characterize differences and sources of volatile flavor compounds by using headspace-gas chromatography-ion mobility spectrometry (HS-GC-IMS) and principal component analysis (PCA). Three sweet cherry fruits from different cultivars (cv. Tie, Van, and Lap) and their wines that were produced by the same yeast were detected. The results showed that 27 flavor compounds were identified in cherry fruits, including 10 alcohols, 7 esters, 7 aldehydes, 2 ketones, and 1 organic acid. Twenty-three flavor compounds were identified in cherry wines, including nine esters, eight alcohols, three aldehydes, two organic acids, and one ketone. In cherry fruits, aldehydes, several alcohols, and one ketone were the most prevalent in cv. Tie, and the majority of esters and alcohols in cv. Van. After fermentation, ethanol, butanol, butanal, ethyl propionate, propionaldehyde, 3-hydroxy-2-butanone, and acetic acid increased, whereas 1-hexanol, 3-methyl-3-buten-1-ol, 1-penten-3-ol, ethyl acetate, methyl acetate, (E)-2-hexenal and hexanal decreased. Few differences were detected in the type and content of volatile compounds in cherry wines from cv. Tieton (WT) and cv. Van (WV). Almost all aldehydes are derived from cherry fruits, which cannot be produced during wine-making, and other volatile compounds are almost all produced by saccharomyces cerevisiae. The volatile compounds of cherry wines were determined by row materials and fermentation cultures. Flavor fingerprints were established by HS-GC-IMS and PCA, which provided a theoretical foundation for the evaluation and improvement of flavor quality in cherry wine-making.

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37

Young, Jay A. "Methyl Ethyl Ketone." Journal of Chemical Education 81, no. 5 (May 2004): 630. http://dx.doi.org/10.1021/ed081p630.

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38

Luttrell, William E., and Lauren R. Bellcock. "Methyl ethyl ketone." Journal of Chemical Health and Safety 22, no. 4 (July 2015): 33–36. http://dx.doi.org/10.1016/j.jchas.2015.06.007.

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39

Kurbatova, Marina, Mariya Cherencova, Tat'yana Raskulova, Mihail Fereferov, and Aleksey Ryabcov. "LOW TEMPERATURE DEWAXING OF OILS IN PRESENCE INDIVIDUAL SOLVENT." Bulletin of the Angarsk State Technical University 1, no. 12 (December 18, 2018): 69–72. http://dx.doi.org/10.36629/2686-777x-2018-1-12-69-72.

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40

Raskulova, Tat'yana, Mihail Fereferov, Marina Kurbatova, Mariya Cherencova, and Irina Polyak. "ON THE REPLACE ABILITY OF SOLVENT IN THE PROCESS OF LOW TEMPERATURE DE-WAXING OF OILS." Modern Technologies and Scientific and Technological Progress 2018, no. 1 (March 23, 2020): 38–39. http://dx.doi.org/10.36629/2686-9896-2020-2018-1-38-39.

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41

Alcoberro, Sandra, Alejandro Gómez-Palomino, Ricard Solà, Pedro Romea, Fèlix Urpí, and Mercè Font-Bardia. "Stereoselective Titanium-Mediated Aldol Reactions of a Chiral Lactate-Derived Ethyl Ketone with Ketones." Organic Letters 16, no. 2 (December 27, 2013): 584–87. http://dx.doi.org/10.1021/ol403461b.

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42

Collins, DJ, JD Cullen, and GM Stone. "The Structure and Function of Estrogens .10. Synthesis of 5,5-Dimethyl-Cis-4b,5,6,10b,11,12-Hexahydrochrysene-2,8-Diol - the Estrogenic Activity of This and of Related C-Methylated Hydrochrysenediols." Australian Journal of Chemistry 41, no. 5 (1988): 745. http://dx.doi.org/10.1071/ch9880745.

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Reaction of 6-methoxy-2-(p- methoxyphenyl )-3,4-dihydronaphthalen-1(2H)- one (9) with dimethylketene ethyl trimethylsilyl acetal (10) in the presence of titanium tetrachloride gave ethyl 2-methyl-2-[6?-methoxy- 2?-(p- methoxyphenyl )-3?,4?-dihydronaphthalen-1?-yl] propanoate (11) which upon treatment with methanesulfonic acid afforded the lactone (13). Reduction of (11) with lithium/ammonia yielded mainly 6-methoxy- 2-(p- methoxyphenyl )-1,2,3,4-tetrahydronaphthalene (16), but hydrogenation of (11) over palladium/charcoal gave 61% of ethyl (1?RS,2?RS)-2-methyl-2-[6?-methoxy-2?-(p- methoxyphenyl )-1?,2?,3?,4?- (tetrahydronaphthalen-1?-yl] propanoate (21a). Alternatively, the ester (21a) was prepared in three steps from the ketone (9) by reaction of the derived 1ξ-acetoxy-6-methoxy-2ξ-(p- methoxyphenyl )-1,2,3,4- tetrahydronaphthalene (20b) with the ketene silyl acetal (10) in the presence of zinc iodide. Treatment of the ester (21a) with methanesulfonic acid afforded 72% of 2,8-dimethoxy-5,5-dimethyl-cis-4b, 10b,11,12-tetrahydrochrysen-6(5H)-one (22) which was converted into 2,8-dimethoxy-5,5-dimethyl-cis-4b,5,6,10b,11,12-hexahydrochrysene (23) in 63% yield via the dithiolan (24). Demethylation of (23) gave 5,5- dimethyl-cis-4b,5,6,10b,11,12-hexahydrochrysene-2,8-diol (3a). �� Assays of the oestrogenic activity of compound (3a), and of related hydrochrysenediols are reported.

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43

Tang, Fei-Fei, Wu-Lin Yang, Xingxin Yu, and Wei-Ping Deng. "Cu(OAc)2/FOXAP complex catalyzed construction of 2,5-dihydropyrrole derivatives via asymmetric 1,3-dipolar cycloaddition of azomethine ylides to ethynyl ketones." Catalysis Science & Technology 5, no. 7 (2015): 3568–75. http://dx.doi.org/10.1039/c5cy00422e.

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Cu(OAc)₂/FOXAP catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylides to ethynyl ketones, affording 2,5-dihydropyrroles in good to excellent yields and excellent enantioselectivities.

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44

K. Amin, Bassam. "Comparative Study of Marginal Gap Among Zirconium Dioxide, Poly Ethyl Ethyl Ketone and Porcelain Fused to Metal Implant Supported Crowns." Sulaimani dental journal 6, no. 1 (June 20, 2019): 29–32. http://dx.doi.org/10.17656/sdj.10087.

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45

Jörges, Mike, Felix Krischer, and Viktoria H. Gessner. "Transition metal–free ketene formation from carbon monoxide through isolable ketenyl anions." Science 378, no. 6626 (December 23, 2022): 1331–36. http://dx.doi.org/10.1126/science.ade4563.

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The capacity of transition metals to bind and transform carbon monoxide (CO) is critical to its use in many chemical processes as a sustainable, inexpensive C1 building block. By contrast, only few s- and p-block element compounds bind and activate CO, and conversion of CO into useful carbonyl-containing organic compounds in such cases remains elusive. We report that metalated phosphorus ylides provide facile access to ketenyl anions ([RC=C=O] – ) by phosphine displacement with CO. These anions are very stable and storable reagents with a distinctive electronic structure between that of the prototypical ketene (H 2 C=C=O) and that of ethynol (HC≡C–OH). Nonetheless, the ketenyl anions selectively react with a range of electrophiles at the carbon atom, thus offering high-yielding and versatile access to ketenes and related compounds.

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46

Özmen, Dilek. "(Liquid+liquid) equilibria of (water+propionic acid+methyl isoamyl ketone or diisobutyl ketone or ethyl isoamyl keton) at T=298.2K." Fluid Phase Equilibria 250, no. 1-2 (December 2006): 70–75. http://dx.doi.org/10.1016/j.fluid.2006.10.004.

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47

Hou, Jia Qi, Ming Xiao Li, Zi Min Wei, Bei Dou Xi, Xuan Jia, Chao Wei Zhu, and Dong Ming Liu. "Critical Components of Odors and VOCs in Mechanical Biological Treatment Process of MSW." Advanced Materials Research 647 (January 2013): 438–49. http://dx.doi.org/10.4028/www.scientific.net/amr.647.438.

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Mechanical Biological Treatment Process of MSW is a new garbage disposal technology for the main purpose to improve the efficiency of garbage sorting. Malodorous gas, namely provisions to limit emissions of the emitted pollutant discharge standard was collected and analyzed, and 64 major VOCs emissions in the process of MBT were also analyzed by gas chromatography-mass spectrometry (GC-MS). The results showed that, First, odor concentration of the top ten odorous substances of VOCs in MSW were successively toluene, ethyl acetate, methylene chloride, methyl ethyl ketone, xylene, styrene, 1,2- dichloropropane, trichlorethylene, ethylbenzene, trimethylbenzene, Accounted for 93.57% of the volume of total VOCs. Therefore, the above VOCs were key control object during MBT process; Second, at trommel link of Mechanical separation process, ammonia, hydrogen sulfide, carbon disulfide, dimethyl sulfide odor concentration were higher 11.67%, 3.8%, 25.42%, 128.93% compared to artificial selection as background value; Third, during biological treatment processes, NH3, H2S were the main control substances. ketones was detected in the end of the biological treatment, indicating that local anaerobic reactor engendered in the composting process. Therefore, proper ventilating was needed to control VOCs production and release in biological process.

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48

Fockenberg, Christopher. "Product Study of the Photolysis of Ketene and Ethyl Ethynyl Ether at 193.3 nm." Journal of Physical Chemistry A 109, no. 32 (August 2005): 7140–50. http://dx.doi.org/10.1021/jp044092g.

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49

Onaca, Christina, Martin Kieninger, Karl-H. Engesser, and Josef Altenbuchner. "Degradation of Alkyl Methyl Ketones by Pseudomonas veronii MEK700." Journal of Bacteriology 189, no. 10 (March 9, 2007): 3759–67. http://dx.doi.org/10.1128/jb.01279-06.

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ABSTRACT Pseudomonas veronii MEK700 was isolated from a biotrickling filter cleaning 2-butanone-loaded waste air. The strain is able to grow on 2-butanone and 2-hexanol. The genes for degradation of short chain alkyl methyl ketones were identified by transposon mutagenesis using a newly designed transposon, mini-Tn5495, and cloned in Escherichia coli. DNA sequence analysis of a 15-kb fragment revealed three genes involved in methyl ketone degradation. The deduced amino acid sequence of the first gene, mekA, had high similarity to Baeyer-Villiger monooxygenases; the protein of the second gene, mekB, had similarity to homoserine acetyltransferases; the third gene, mekR, encoded a putative transcriptional activator of the AraC/XylS family. The three genes were located between two gene groups: one comprising a putative phosphoenolpyruvate synthase and glycogen synthase, and the other eight genes for the subunits of an ATPase. Inactivation of mekA and mekB by insertion of the mini-transposon abolished growth of P. veronii MEK700 on 2-butanone and 2-hexanol. The involvement of mekR in methyl ketone degradation was observed by heterologous expression of mekA and mekB in Pseudomonas putida. A fragment containing mekA and mekB on a plasmid was not sufficient to allow P. putida KT2440 to grow on 2-butanone. Not until all three genes were assembled in the recombinant P. putida was it able to use 2-butanone as carbon source. The Baeyer-Villiger monooxygenase activity of MekA was clearly demonstrated by incubating a mekB transposon insertion mutant of P. veronii with 2-butanone. Hereby, ethyl acetate was accumulated. To our knowledge, this is the first time that ethyl acetate by gas chromatographic analysis has been definitely demonstrated to be an intermediate of MEK degradation. The mekB-encoded protein was heterologously expressed in E. coli and purified by immobilized metal affinity chromatography. The protein exhibited high esterase activity towards short chain esters like ethyl acetate and 4-nitrophenyl acetate.

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50

Skornyakov, Yu V., N. A. Lozinskaya, M. V. Proskurnina, and N. S. Zefirov. "New Synthesis of Conjugated Ethynyl Vinyl Ketones." Russian Journal of Organic Chemistry 41, no. 4 (April 2005): 617. http://dx.doi.org/10.1007/s11178-005-0213-z.

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