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Journal articles on the topic '3-dimethylpentane'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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1

Dokolas, Peter, Steven M. Loer, and David H. Solomon. "Reaction of Acyclic Hydrocarbons Towards t-Butoxy Radicals. A Study of Hydrogen Atom Abstraction by Using the Radical Trapping Technique." Australian Journal of Chemistry 51, no. 12 (1998): 1113. http://dx.doi.org/10.1071/c98055.

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The reaction of 3-methylpentane and 2,4-dimethylpentane toward t-butoxy radicals has been investigated, in neat and benzene solutions, by using the radical trapping technique. Abstraction occurs principally from the tertiary and secondary C-H reaction sites of 3-methylpentane and the tertiary position of 2,4-dimethylpentane. The tertiary and in particular secondary C-H reaction sites of 2,4-dimethylpentane are shown to be considerably less susceptible towards t-butoxy radical facilitated abstraction compared with the equivalent reaction sites of 3-methylpentane. As a result, the latter is three times as reactive as 2,4-dimethylpentane as a neat hydrocarbon solution and seven times as reactive in a diluted mixture of benzene. Diferences in selectivity and rate of hydrogen abstraction, between the substrates, are interpreted in terms of non-bonding interactions retarding t-butoxy radicals from approaching sterically demanding C-H reaction sites. The selectivity from 3-methylpentane is solvent-insensitive whereas abstraction from 2,4-dimethylpentane is modified in benzene. Further, the rate of hydrogen abstraction, from either substrate, to t-butoxy radical β-scission is considerably smaller in benzene. Both observations are interpreted in terms of t-butoxy radical solvation by the aromatic solvent.

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2

Svoboda, Václav, Vladimı́r Hynek, and Bohumı́r Koutek. "Enthalpies of vaporization, and the cohesive and internal energies of 2,2-dimethylpentane, 2,4-dimethylpentane, 2,2,3-trimethylpentane, 2,3,3-trimethylpentane, and 3-ethylpentane." Journal of Chemical Thermodynamics 30, no. 11 (November 1998): 1411–17. http://dx.doi.org/10.1006/jcht.1998.0414.

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3

NAGUMO, Shinji, Takayuki ARAI, and Hiroyuki AKITA. "Enzymatic Hydrolysis of meso(syn-syn)-1,3,5-Triacetoxy-2,4-dimethylpentane and Acetylation of meso(syn-syn)-3-Benzyloxy-2,4-dimethylpentane-1,5-diol by Lipase." CHEMICAL & PHARMACEUTICAL BULLETIN 44, no. 7 (1996): 1391–94. http://dx.doi.org/10.1248/cpb.44.1391.

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4

NAGUMO, S., T. ARAI, and H. AKITA. "ChemInform Abstract: Enzymatic Hydrolysis of meso(syn-syn)-1,3,5-Triacetoxy-2,4- dimethylpentane and Acetylation of meso(syn-syn)-3-Benzyloxy-2,4- dimethylpentane-1,5-diol by Lipase." ChemInform 28, no. 1 (August 4, 2010): no. http://dx.doi.org/10.1002/chin.199701051.

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5

Solano-Serena, Floriane, Rémy Marchal, Serge Casarégola, Christelle Vasnier, Jean-Michel Lebeault, and Jean-Paul Vandecasteele. "A Mycobacterium Strain with Extended Capacities for Degradation of Gasoline Hydrocarbons." Applied and Environmental Microbiology 66, no. 6 (June 1, 2000): 2392–99. http://dx.doi.org/10.1128/aem.66.6.2392-2399.2000.

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ABSTRACT A bacterial strain (strain IFP 2173) was selected from a gasoline-polluted aquifer on the basis of its capacity to use 2,2,4-trimethylpentane (isooctane) as a sole carbon and energy source. This isolate, the first isolate with this capacity to be characterized, was identified by 16S ribosomal DNA analysis, and 100% sequence identity with a reference strain of Mycobacterium austroafricanum was found. Mycobacterium sp. strain IFP 2173 used an unusually wide spectrum of hydrocarbons as growth substrates, including n-alkanes and multimethyl-substituted isoalkanes with chains ranging from 5 to 16 carbon atoms long, as well as substituted monoaromatic hydrocarbons. It also attacked ethers, such as methyl t-butyl ether. During growth on gasoline, it degraded 86% of the substrate. Our results indicated that strain IFP 2173 was capable of degrading 3-methyl groups, possibly by a carboxylation and deacetylation mechanism. Evidence that it attacked the quaternary carbon atom structure by an as-yet-undefined mechanism during growth on 2,2,4-trimethylpentane and 2,2-dimethylpentane was also obtained.

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6

Schuler, Robert H., and Laszlo Wojnarovits. "Radical Yields in the Radiolysis of Branched Hydrocarbons: Tertiary C−H Bond Rupture in 2,3-Dimethylbutane, 2,4-Dimethylpentane, and 3-Ethylpentane." Journal of Physical Chemistry A 107, no. 43 (October 2003): 9240–47. http://dx.doi.org/10.1021/jp030658+.

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7

Bouzas, Alberto, M. Cruz Burguet, Juan B. Montón, and Rosa Muñoz. "Densities, Viscosities, and Refractive Indices of the Binary Systems Methyltert-Butyl Ether + 2-Methylpentane, + 3-Methylpentane, + 2,3-Dimethylpentane, and + 2,2,4-Trimethylpentane at 298.15 K." Journal of Chemical & Engineering Data 45, no. 2 (March 2000): 331–33. http://dx.doi.org/10.1021/je9902793.

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8

Guerrero-Zárate, David, Gustavo A. Iglesias-Silva, and Alejandro Estrada-Baltazar. "P–ρ–T Data and Derivative Properties of 3-Methylpentane, 2,4-Dimethylpentane, and 2,3,4-Trimethylpentane from 283.15 to 363.15 K at Pressures up to 65 MPa." Journal of Chemical & Engineering Data 64, no. 12 (December 3, 2019): 6020–30. http://dx.doi.org/10.1021/acs.jced.9b00846.

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9

Akai, Yuto, Laure Konnert, Takeshi Yamamoto, and Michinori Suginome. "Asymmetric Suzuki–Miyaura cross-coupling of 1-bromo-2-naphthoates using the helically chiral polymer ligand PQXphos." Chemical Communications 51, no. 33 (2015): 7211–14. http://dx.doi.org/10.1039/c5cc01074h.

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Axially chiral 1,1′-biaryl-2-carboxylates were synthesized via Suzuki–Miyaura cross-coupling of 2,4-dimethylpentan-3-yl 1-halo-2-naphthoates with arylboronic acids with single-handed helical polymer ligands PQXphos.

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10

Collins, DJ, and HA Jacobs. "Steric and Stereoelectronic Effects in the Hydrogenolysis and Birch Reduction of Some Hindered Tertiary-Benzylic Carbinols." Australian Journal of Chemistry 40, no. 12 (1987): 1989. http://dx.doi.org/10.1071/ch9871989.

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3-(4'-Methoxyphenyllpentan-3-ol (3a) and 3-(4'-methoxypheny1)-2,4-dimethylpentan-3-ol (3b) underwent catalytic hydrogenolysis over 10% palladium/charcoal at moderate temperatures and pressures. The more hindered tertiary-benzylic carbinols 3-(4'-methoxypheny1)-2,2,4-trimethylpentan-3-ol (6), 3-(4'-methoxyphenyl)-2,2,4,4-tetramethylpentan-3-ol (3c), 1-(4'- methoxyphenyl )-2,2,6,6-tetramethylcyclohexan-l-ol (8) and 1-(1',1'-dimethylethy1)-6-methoxy- 2,2-dimethyl-l,2,3,4-tetrahydronaphthalen-1-ol (10) were completely resistant to hydrogenolysis, even under vigorous conditions. While the hindered tertiary-benzylic carbinols (6),(8) and (10) readily underwent Birch reduction, the analogous di-t-butyl anisyl carbinol (3c) was unchanged. The failure of (3c) to undergo Birch reduction is probably due to a hitherto unrecognized stereoelectronic effect: the C-OH bond of (3c) is constrained to lie more or less in the plane of the benzene ring, and addition of an electron to the benzene ring of the derived oxyanion (31) is inhibited in this conformation.

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11

Wilson, W. C., J. Simon, and J. E. Garst. "The effects of selected bulky substituents on the pulmonary toxicity of 3-furyl ketones in mice." Journal of Animal Science 68, no. 4 (April 1, 1990): 1072–76. http://dx.doi.org/10.2527/1990.6841072x.

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Abstract Preliminary studies examined the toxicity of a series of simple alkyl 3-furyl ketone congeners of perilla ketone, 1-(3-furyl)-4-methylpentan-1-one (1), in mice, but little was known about how aromatic or bulky side chains might affect toxicity. Therefore, 3-furylphenyl ketone (2) 3-furylphenethyl ketone (3) and 1-3-furyl-4, 4-dimethylpentan-1-one (4) were synthesized to examine this problem. The 48-h LD50 (i.p.) in Notre Dame Swiss mice for each analog was greater than that of the parent toxicant, perilla ketone (1, 30 ± 5; 2, 173 ± 4; 3, 150 ± 11; 4, 79 ± 5 µmol/kg). Absorption and distribution of these compounds should be similar based on their lipophilicities. Preliminary evidence suggested that the reduced toxicities of 2, 3 and 4 compared with 1 cannot be explained on the basis of 13C-NMR (electron density) characteristics. Instead, the reduced potency likely is the result of steric hindrance of bioactivation by the bulky side chain substituents and(or) alternative metabolism on the phenyl ring rather than the furan ring of 2 and 3.

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12

Sharon, Daniel, Pessia Sharon, Daniel Hirshberg, Michael Salama, Michal Afri, Linda J. W. Shimon, Won-Jin Kwak, Yang-Kook Sun, Aryeh A. Frimer, and Doron Aurbach. "2,4-Dimethoxy-2,4-dimethylpentan-3-one: An Aprotic Solvent Designed for Stability in Li–O2 Cells." Journal of the American Chemical Society 139, no. 34 (August 18, 2017): 11690–93. http://dx.doi.org/10.1021/jacs.7b06414.

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13

Salzmann, Michael, Yuri P. Tsentalovich, and Hanns Fischer. "Photolysis of 2,4-dihydroxy-2,4-dimethylpentan-3-one studied by quantitative time-resolved CIDNP and optical spectroscopy." Journal of the Chemical Society, Perkin Transactions 2, no. 10 (1994): 2119. http://dx.doi.org/10.1039/p29940002119.

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14

Mills, Patrick L., and Ricky L. Fenton. "Vapor pressures, liquid densities, liquid heat capacities, and ideal gas thermodynamic properties for 3-methylhexanal and 3,4-dimethylpentanal." Journal of Chemical & Engineering Data 32, no. 2 (April 1987): 266–73. http://dx.doi.org/10.1021/je00048a035.

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15

Nguyen, Kim, Pascal Sutter, and Philip Kraft. "Search for New Linear Musks Devoid of a 2,2-Dimethyl-1,4-dioxabutane Unit: Synthesis and Olfactory Properties of 5-Substituted (3E)-Hex-3-enoates on the Way to Carba-Helvetolide and Carba-Serenolide." Synthesis 49, no. 11 (March 14, 2017): 2443–60. http://dx.doi.org/10.1055/s-0036-1588740.

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Since the nucleophilic opening of isobutylene oxide competes with the formation of polyethers, the 2,2-dimethyl-1,4-dioxabutane moiety constitutes the most important cost driver in the synthesis of linear musks. Therefore, musk motifs devoid of this structural element would be highly attractive. Based on molecular modeling considerations, 5-methyl-substituted (3E)-configured alk-3-enoic esters accessible by deconjugative Knoevenagel reaction with malonic acid in the presence of piperidinium acetate with citronellal and Florhydral as substrates, were synthesized but showed disappointing olfactory properties, as did inverted ester motifs or dimethyl carbinols. Moving closer to carba-Serenolide structures, isobutyronitrile was added to m-isopropenylcumene. DIBAL-H with subsequent alanate reduction provided 4-(3-isopropylphenyl)-2,2-dimethylpentan-1-ol, which was either directly esterified, or esterified after Birch reduction and full hydrogenation. While these target structures were all odorless, (2E)-4-(3,3-dimethylcyclohexyl)pent-2-en-1-yl cyclopropanecarboxylate turned out to be a decent musk odorant (4.1 ng/L air). This proved the concept of an (E)-configured double bond in the middle of anticipated horseshoe-shaped conformers, but casted doubt on the non-importance of the ether oxygens in Helvetolide and Serenolide. Therefore, carba-Helvetolide and carba-Serenolide were synthesized from 3,3-dimethylcyclohexanone, and indeed turned out to be completely odorless. So polar interactions play a crucial role in the receptor interaction of these linear musks beyond merely favoring horseshoe-shaped conformers.

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16

Wibaut, J. P., and J. Smittenberg. "Comments on a paper by Paul L. Cramer and Verle A. Miller, entitled “The thermal decomposition of the acetate of 2,2-dimethylpentanol-3”)." Recueil des Travaux Chimiques des Pays-Bas 61, no. 5 (September 3, 2010): 348–52. http://dx.doi.org/10.1002/recl.19420610504.

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17

Vakalopoulou, Efthymia, Christine Buchmaier, Andreas Pein, Robert Saf, Roland C. Fischer, Ana Torvisco, Fernando Warchomicka, Thomas Rath, and Gregor Trimmel. "Synthesis and characterization of zinc di(O-2,2-dimethylpentan-3-yl dithiocarbonates) bearing pyridine or tetramethylethylenediamine coligands and investigation of their thermal conversion mechanisms towards nanocrystalline zinc sulfide." Dalton Transactions 49, no. 41 (2020): 14564–75. http://dx.doi.org/10.1039/d0dt03065a.

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18

Camara, Susana, Bruce C. Gilbert, Robert J. Meier, Martin van Duin, and Adrian C. Whitwood. "EPR and modelling studies of hydrogen-abstraction reactions relevant to polyolefin cross-linking and grafting chemistryElectronic supplementary information (ESI) available: computed 3D structures of the transition states of hydrogen abstraction from 2,4-dimethylpentane by tert-butoxyl radical. “1 ry24dmp.pdb”: H-abstraction from the methyl group (to generate a primary radical). “2ry24dmp.pdb”: H-abstraction from the central methylene group (to generate a secondary radical). “3 ry24dmp.pdb”: H-abstraction from the methine group (to generate a tertiary radical). See http://www.rsc.org/suppdata/ob/b2/b212543a/." Organic & Biomolecular Chemistry 1, no. 7 (March 10, 2003): 1181–90. http://dx.doi.org/10.1039/b212543a.

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19

Valeev, R. F., G. R. Sunagatullina, V. V. Loza, and M. S. Miftakhov. "Synthesis of an Acyclic Precursor to Epothilone D Analog. Aldol Condensation of (1R)-1-(1,3-Dithiolan-2-yl)-1-(methoxymethoxy)- 2,2-dimethylpentan-3-one with C6‒C21 and C6‒C9 Aldehyde Segments." Russian Journal of Organic Chemistry 54, no. 10 (October 2018): 1548–52. http://dx.doi.org/10.1134/s1070428018100172.

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20

Khroyan, Taline V., Willma E. Polgar, Gerta Cami-Kobeci, Stephen M. Husbands, Nurulain T. Zaveri, and Lawrence Toll. "The First Universal Opioid Ligand, (2S)-2-[(5R,6R,7R,14S)-N-cyclopropylmethyl-4,5-epoxy-6,14-ethano-3-hydroxy-6-methoxymorphinan-7-yl]-3,3-dimethylpentan-2-ol (BU08028): Characterization of the In Vitro Profile and In Vivo Behavioral Effects in Mouse Models of Acute Pain and Cocaine-Induced Reward." Journal of Pharmacology and Experimental Therapeutics 336, no. 3 (December 21, 2010): 952–61. http://dx.doi.org/10.1124/jpet.110.175620.

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21

Chen, Xiaoyu, Ruquan Liang, Lichun Wu, and Gan Cui. "Non-Equilibrium Molecular Dynamics Study of the Influence of Branching on the Soret Coefficient of Binary Mixtures of Heptane Isomers." Journal of Non-Equilibrium Thermodynamics, May 11, 2021. http://dx.doi.org/10.1515/jnet-2020-0110.

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Abstract Equimolar mixtures composed of isomers were firstly used to investigate the molecular branching effect on thermal diffusion behavior, which was not disturbed by factors of molecular mass and composition in this work. Eight heptane isomers, including n-heptane, 2-methylhexane, 3-methylhexane, 2,2-dimethylpentane, 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethylpentane and 3-ethylpentane, were chosen as the researched mixtures. A non-equilibrium molecular dynamics (NEMD) simulation with enhanced heat exchange (eHEX) algorithm was applied to calculate the Soret coefficient at T = 303.15 T=303.15 K and P = 1.0 atm P=1.0\hspace{0.1667em}\text{atm} . An empirical correlation based on an acentric factor was proposed and its calculation coincides with the simulated results, which showed the validity of the NEMD simulation. It is demonstrated that the isomer with higher acentric factor has a stronger thermophilic property and tends to migrate to the hot region in the heptane isomer mixture, and the extent of thermal diffusion is proportional to the difference between the acentric factors of the isomers.

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22

Biswas, Suparna Mandal. "2-bromo-1-(2-hydroxyphenyI)-3,4-dimethyIpentan-1-one: A New Bromo-Compound with Stimulatory Activity Isolated from the Shed Leaves of Teak, (Tectona grandis L.)." Annals of Tropical Research, April 6, 2012, 65–78. http://dx.doi.org/10.32945/atr3414.2012.

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A new Bromo isotopic compound has been isolated and purified from the Methanol Fraction of Teak leaves (MFTk). Chromatographic and spectral analyses (TLC, UV, MS, NMR, and IR) indicated the compound to be 2-bromo-1-(2-hydroxypheny1)-3, 4-dimethylpentan-1-one, in short, BrHPDMP with molecular weights 285 and 287. The whole leaf leachate of teak showed strong inhibitory activity in bioassay. But when fraction-4 (Methanolic fraction of teak leaf) was isolated and purified, it showed concentration dependent stimulatory activity on rice seeds. At 1000 ppm concentration, it showed 12.820% inhibition in shoot and 15.59% stimulation in root length. Below this concentration, it showed stimulatory effects on both shoot and root length. At 500ppm, it revealed 10.040% stimulation in shootlength and 34.16% stimulation in root length. At a concentration of 31.25ppm, it revealed maximum stimulatory effects i.e. 16.260% stimulation in shoot length and 42.78% stimulation in rootlength.

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