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Letteratura scientifica selezionata sul tema "Cycloalkanes"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 6 settembre 2023

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Articoli di riviste sul tema "Cycloalkanes"

1

Herman, David C., Phillip M. Fedorak e J. William Costerton. "Biodegradation of cycloalkane carboxylic acids in oil sand tailings". Canadian Journal of Microbiology 39, n. 6 (1 giugno 1993): 576–80. http://dx.doi.org/10.1139/m93-083.

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The biodegradation of both an n-alkane and several carboxylated cycloalkanes was examined within tailings produced by the extraction of bitumen from the Athabasca oil sands. The carboxylated cycloalkanes examined were structurally similar to naphthenic acids that have been associated with the acute toxicity of oil sand tailings. The biodegradation potential of naphthenic acids was estimated by determining the biodegradation of both the carboxylated cycloalkanes and hexadecane in oil sand tailings. Carboxylated cycloalkanes were biodegraded within oil sand tailings, although compounds with methyl substitutions on the cycloalkane ring were more resistant to microbial degradation. Microbial activity against hexadecane and certain carboxylated cycloalkanes was found to be nitrogen and phosphorus limited.Key words: biodegradation, carboxylated cycloalkanes, oil sand tailings.

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2

Chen, Yubin, Bin Yuan, Chaomin Wang, Sihang Wang, Xianjun He, Caihong Wu, Xin Song et al. "Online measurements of cycloalkanes based on NO⁺ chemical ionization in proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS)". Atmospheric Measurement Techniques 15, n. 23 (2 dicembre 2022): 6935–47. http://dx.doi.org/10.5194/amt-15-6935-2022.

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Abstract. Cycloalkanes are important trace hydrocarbons existing in the atmosphere, and they are considered a major class of intermediate volatile organic compounds (IVOCs). Laboratory experiments showed that the yields of secondary organic aerosols (SOAs) from oxidation of cycloalkanes are higher than acyclic alkanes with the same carbon number. However, measurements of cycloalkanes in the atmosphere are still challenging at present. In this study, we show that online measurements of cycloalkanes can be achieved using proton transfer reaction time-of-flight mass spectrometry with NO+ chemical ionization (NO+ PTR-ToF-MS). Cyclic and bicyclic alkanes are ionized with NO+ via hydride ion transfer, leading to major product ions of CnH2n-1+ and CnH2n-3+, respectively. As isomers of cycloalkanes, alkenes undergo association reactions with major product ions of CnH2n ⚫ (NO)+, and concentrations of 1-alkenes and trans-2-alkenes in the atmosphere are usually significantly lower than cycloalkanes (about 25 % and <5 %, respectively), as a result inducing little interference with cycloalkane detection in the atmosphere. Calibrations of various cycloalkanes show similar sensitivities associated with small humidity dependence. Applying this method, cycloalkanes were successfully measured at an urban site in southern China and during a chassis dynamometer study of vehicular emissions. Concentrations of both cyclic and bicyclic alkanes are significant in urban air and vehicular emissions, with comparable cyclic alkanes / acyclic alkanes ratios between urban air and gasoline vehicles. These results demonstrate that NO+ PTR-ToF-MS provides a new complementary approach for the fast characterization of cycloalkanes in both ambient air and emission sources, which can be helpful to fill the gap in understanding the importance of cycloalkanes in the atmosphere.

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3

Wang, Jian, He Liu, Shiguang Fan, Shuai Wang, Guanjun Xu, Aijun Guo e Zongxian Wang. "Dehydrogenation of Cycloalkanes over N-Doped Carbon-Supported Catalysts: The Effects of Active Component and Molecular Structure of the Substrate". Nanomaterials 11, n. 11 (26 ottobre 2021): 2846. http://dx.doi.org/10.3390/nano11112846.

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Efficient dehydrogenation of cycloalkanes under mild conditions is the key to large-scale application of cycloalkanes as a hydrogen storage medium. In this paper, a series of active metals loaded on nitrogen-doped carbon (M/CN, M = Pt, Pd, Ir, Rh, Au, Ru, Ag, Ni, Cu) were prepared to learn the role of active metals in cycloalkane dehydrogenation with cyclohexane as the model reactant. Only Pt/CN, Pd/CN, Rh/CN and Ir/CN can catalyze the dehydrogenation of cyclohexane under the set conditions. Among them, Pt/CN exhibited the best catalytic activity with the TOF value of 269.32 h−1 at 180 °C, followed by Pd/CN, Rh/CN and Ir/CN successively. More importantly, the difference of catalytic activity between these active metals diminishes with the increase in temperature. This implies that there is a thermodynamic effect of cyclohexane dehydrogenation with the synthetic catalysts, which was evidenced by the study on the activation energy. In addition, the effects of molecular structure on cycloalkane dehydrogenation catalyzed by Pt/CN were studied. The results reveal that cycloalkane dehydrogenation activity and hydrogen production rate can be enhanced by optimizing the type, quantity and position of alkyl substituents on cyclohexane.

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4

Bogdanowicz-Szwed, Krystyna, e Michalina Kozicka. "Phase-Transfer Catalysed Alkylation of Enamines of some Cyclic β-Keto Carbothionic Acid Anilides with 1,2-Dibromoethane. Synthesis of Enamines of 1-Oxo-2-(3-phenyl tetrahydrothiazol-2-ylidene)-cycloalkanes". Zeitschrift für Naturforschung B 42, n. 9 (1 settembre 1987): 1174–80. http://dx.doi.org/10.1515/znb-1987-0919.

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The alkylation of morpholine enam ines of 2-oxo-cycloalkane-1-carbothionic acid anilides (1-3) with 1,2-dibromoethane under phase-transfer catalytic conditions yields enam ines of 1-oxo-2-(3-phenyl-tetrahydrothiazol-2-ylidene)-cycloalkanes (4-6). Compounds 4-6 were hydrolysed to appropriate keto derivatives 8-10. The structure of obtained com pounds was established on the basis of IR. NM R and MS spectral data.

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5

Wang, Wei, Shaoying Sun, Fengan Han, Guangyi Li, Xianzhao Shao e Ning Li. "Synthesis of Diesel and Jet Fuel Range Cycloalkanes with Cyclopentanone and Furfural". Catalysts 9, n. 11 (25 ottobre 2019): 886. http://dx.doi.org/10.3390/catal9110886.

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Diesel and jet fuel range cycloalkanes were obtained in ~84.8% overall carbon yield with cyclopentanone and furfural, which can be produced from hemicellulose. Firstly, 2,5-bis(furan-2-ylmethyl)-cyclopentanone was prepared by the aldol condensation/hydrogenation reaction of cyclopentanone and furfural under solid base and selective hydrogenation catalyst. Over the optimized catalyst (Pd/C-CaO), 98.5% carbon yield of 2,5-bis(furan-2-ylmethyl)-cyclopentanone was acquired at 423 K. Subsequently, the 2,5-bis(furan-2-ylmethyl)-cyclopentanone was further hydrodeoxygenated over the M/H-ZSM-5(Pd, Pt and Ru) catalyst. Overall, 86.1% carbon yield of diesel and jet fuel range cycloalkanes was gained over the Pd/H-ZSM-5 catalyst under solvent-free conditions. The cycloalkane mixture obtained in this work has a high density (0.82 g mL−1) and a low freezing point (241.7 K). Therefore, it can be mixed into diesel and jet fuel to increase their volumetric heat values or payloads.

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6

Staudt, Svenja, Edyta Burda, Carolin Giese, Christina A. Müller, Jan Marienhagen, Ulrich Schwaneberg, Werner Hummel, Karlheinz Drauz e Harald Gröger. "Direct Oxidation of Cycloalkanes to Cycloalkanones with Oxygen in Water". Angewandte Chemie International Edition 52, n. 8 (21 gennaio 2013): 2359–63. http://dx.doi.org/10.1002/anie.201204464.

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7

Shen, Hai M., Xiong Wang, A. Bing Guo, Long Zhang e Yuan B. She. "Catalytic oxidation of cycloalkanes by porphyrin cobalt(II) through efficient utilization of oxidation intermediates". Journal of Porphyrins and Phthalocyanines 24, n. 10 (29 settembre 2020): 1166–73. http://dx.doi.org/10.1142/s1088424620500303.

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The catalytic oxidation of cycloalkanes using molecular oxygen employing porphyrin cobalt(II) as catalyst was enhanced through use of cycloalkyl hydroperoxides, which are the primary intermediates in oxidation of cycloalkanes, as additional oxidants to further oxidize cycloalkanes in the presence of porphyrin copper(II), especially for cyclohexane, for which the selectivity was enhanced from 88.6 to 97.2% to the KA oil; at the same time, the conversion of cyclohexane was enhanced from 3.88 to 4.41%. The enhanced efficiency and selectivity were mainly attributed to the avoided autoxidation of cycloalkanes and efficient utilization of oxidation intermediate cycloalkyl hydroperoxides as additional oxidants instead of conventional thermal decomposition. In addition to cyclohexane, the protocol presented in this research is also very applicable in the oxidation of other cycloalkanes such as cyclooctane, cycloheptane and cyclopentane, and can serve as a applicable and efficient strategy to boost the conversion and selectivity simultaneously in oxidation of alkanes. This work also is a very important reference for the extensive application of metalloporphyrins in catalysis chemistry.

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8

Silva, Letícia B., Felipe S. Stefanello, Sarah C. Feitosa, Clarissa P. Frizzo, Marcos A. P. Martins, Nilo Zanatta, Bernardo A. Iglesias e Helio G. Bonacorso. "Novel 7-(1H-pyrrol-1-yl)spiro[chromeno[4,3-b]quinoline-6,1′-cycloalkanes]: synthesis, cross-coupling reactions, and photophysical properties". New Journal of Chemistry 45, n. 8 (2021): 4061–70. http://dx.doi.org/10.1039/d0nj05740a.

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This paper covers the synthesis of a series of eleven examples of new 7-(1H-pyrrol-1-yl)spiro[chromeno[4,3-b]quinoline-6,1′-cycloalkanes] (3), where cycloalkanes are cyclopentane, cyclohexane, and cycloheptane.

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9

Wackett, Lawrence P. "Cycloalkanes and bacteria". Environmental Microbiology 16, n. 1 (gennaio 2014): 333–34. http://dx.doi.org/10.1111/1462-2920.12336.

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10

Geraghty, Niall W. A., e John J. Hannan. "Functionalisation of cycloalkanes: the photomediated reaction of cycloalkanes with alkynes". Tetrahedron Letters 42, n. 18 (aprile 2001): 3211–13. http://dx.doi.org/10.1016/s0040-4039(01)00390-2.

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Più fonti

Tesi sul tema "Cycloalkanes"

1

Warburton, Elizabeth Jean. "The metabolism of cycloalkanes by different species of Xanthobacter". Thesis, Nottingham Trent University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329184.

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2

Shirley, Neil John. "Synthesis of compounds of natural and unnatural origin by intramolecular alkylations". Title page, contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phs558.pdf.

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3

Parkinson, Nigel Christopher. "Nucleoside and nucleotide analogues containing fluorine". Thesis, Durham University, 1993. http://etheses.dur.ac.uk/5639/.

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The work contained in this thesis is divided into four sections detailing the formation of (diethoxyphosphinyl)difluoromethylene substituted cycloalkanes and alkenes and their chemistry, as well as the syntheses of purine and pyrimidine substituted polyfluoroethers:(i) The methodology for the introduction of the (diethoxyphosphinyl)difluoromethylene group was studied and extended, with specific reference to cyclic systems. The group was successfully introduced into cyclic alkenes with (diethoxyphosphinyl)difluoro- methylene zinc bromide and saturated systems with (diethoxyphosphinyl)difluoromethyl lithium. The organolithium reagent was also shown to be capable of ring opening epoxides to yield alcohols ;(ii) The (diethoxyphosphinyl)difluoromethylene substituted cyclohexene derivative was further functionalised in a four step process to a new class of adenine and guanine based nucleotide analogues. Model studies were carried out on the (diethoxyphosphinyl)- difluoromethylene substituted cyclohexene derivative with a variety of reagents to introduce functionality at the double bond;(iii) The radical addition of (diethoxyphosphinyl)bromodifluoromethane and (diethoxyphosphinyl)difluoroiodomethane to cycloalkenes using ultraviolet photolysis and gamma-ray initiation were successfully carried out, thus opening up a new route into (diethoxyphosphinyl)difluoromethylene substituted cycloalkanes;(iv) The synthesis of purine and pyrimidine nucleoside analogues is described via the coupling of 2-amino-6-chloropurine, 6-chloropurine, silylated 5-fluorouracil and silylated uracil to various α-haloethers. The α-haloethers having previously been synthesised by radical chlorination of both cyclic and acyclic polyfluoroethers.

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4

Gray, Gary. "The oxidation of cycloalkanes using dioxygen catalysed by homogeneous and supported metalloporphyrins". Thesis, University of York, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245972.

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5

Budkina, Darya S. "Ultrafast photophysical and photochemical dynamics of polyhalogenated alkanes, cycloalkanes, and transition metal complexes". Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1553686775405944.

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6

Navasero, Neenah. "Synthetic routes to non-symmetric tropones". Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101647.

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The synthesis of substituted non-symmetric tropones has proven to be a considerable synthetic challenge. Particularly, a 3,4,6-tnsubstituted tropone which is required for the total synthesis of CP-225,917 is currently being undertaken by our group.
Two approaches towards the synthesis of substituted tropones are presented. Both utilize linear diene precursors which are closed to 7-membered cycloheptene rings via ring closing metathesis. In the first method, linear precursors are synthesized by addition of nucleophilic substituents to carbonyl groups to form alcohol groups. After forming the cycloheptene ring, the alcohol groups are eliminated to form the tropone. The second method uses an oxidation protocol to form a,(3-unsaturation on either side of a cycloheptenone precursor. An attempt towards the synthesis of the desired tropone required for the CP-225,917 synthesis is also presented.
The methods described here use simple inexpensive starting materials and provide access to tropone substitution not readily available through other means.

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7

McCleary, Michelle Angela, e n/a. "Synthetic and Structural Studies on the Novel Formation of Bicyclo[n.2.0]alkan-1-ols". Griffith University. School of Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040520.143342.

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Reaction of phenyl vinyl sulfoxide with the lithium enolates of simple ketones of varying ring size (cyclopentanone, cycloheptanone and cyclooctanone) under controlled cyclisation conditions followed by subsequent oxidation resulted in the formation of the bicyclo[n.2.0]alkan-1-ols 253-255, 262, 263, 265, 268 and 269 in conjunction with alkylated species 256, 257, 264, 266 and 267. The ratio of bicyclo[n.2.0]alkan-1-ols to alkylated ketone formation observed was dependent on a number of factors including the variation of enolate reactivity between the different ring sizes, conversion of phenyl vinyl sulfoxide, time, temperature and concentration of reaction and the stability and steric strain observed in the final bicyclo[n.2.0]alkan-1-ol product. X-ray crystal structures of 253, 262 and 265 were obtained and a structural study showed that as the overall steric strain in the bicyclo[n.2.0]alkan-1-ol product is decreased there is a corresponding increase in product distribution in favour of bicyclo[n.2.0]alkan-1-ol formation in conjunction with increased yields. Selected substituted and functionalised ketones (2-methylcyclopentanone, 2,6-dimethylcyclohexanone, 2-methylcyclohexanone and 1,4-cyclohexanedione mono-ethylene ketal) also reacted in the cyclisation reaction to give bicyclo[n.2.0]alkan-1-ols 270, 271, 277, 278, 281, 282, 285 and 286 in conjunction with alkylated products 272, 279, 280, 283, 284 and 287. Incorporation of substitution at the bridgehead and C2 position had a role in the preference of the major stereochemical isomer observed for a bicyclo[n.2.0]alkan-1-ol (n = 3, 4). A structural comparison of the X-ray crystal structures of 278, 281 and 286 indicated that the pseudo chair conformation of the six-membered ring influenced ring torsion and bond angles in the bicyclo[4.2.0]octanol ring system. Two model studies were selected to illustrate the potential application of the cyclisation process as methodology towards natural product synthesis or complex ring systems. No bicyclo[n.2.0]alkan-1-ol formation was evident in an intramolecular example using the starting ketone 291 in which the electrophile is tethered to the ketone. 2,6-Dimethyl-2-cyclohexen-1-one 301 considered as a model study towards the synthesis of the antibiotic mellolide, upon reaction with phenyl vinyl sulfoxide and oxidation displayed poor reactivity. The novel bicyclo[2.2.2]octanones 303, 304 and 305 were formed in very low yields. The lack of reactivity of the ketones 2,6-dimethyl-2-cyclohexen-1-one, 1,2-cyclohexanedione and 1,4-cyclohexanedione towards bicyclo[n.2.0]alkan-1-ol formation suggested that conjugation in the enolate prior to reaction with phenyl vinyl sulfoxide was not favourable. The non-reactivity of these ketones and the hindered ketone camphor indicated the potential limitations to the cyclisation methodology. However, conversion of the ketal functionality of 286 to a ketone resulted in the formation of the functionalised bicyclo[4.2.0]octanol 288 providing positive indications for further synthetic applications.

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8

McCleary, Michelle Angela. "Synthetic and Structural Studies on the Novel Formation of Bicyclo[n.2.0]alkan-1-ols". Thesis, Griffith University, 2004. http://hdl.handle.net/10072/366615.

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Abstract (sommario):

Reaction of phenyl vinyl sulfoxide with the lithium enolates of simple ketones of varying ring size (cyclopentanone, cycloheptanone and cyclooctanone) under controlled cyclisation conditions followed by subsequent oxidation resulted in the formation of the bicyclo[n.2.0]alkan-1-ols 253-255, 262, 263, 265, 268 and 269 in conjunction with alkylated species 256, 257, 264, 266 and 267. The ratio of bicyclo[n.2.0]alkan-1-ols to alkylated ketone formation observed was dependent on a number of factors including the variation of enolate reactivity between the different ring sizes, conversion of phenyl vinyl sulfoxide, time, temperature and concentration of reaction and the stability and steric strain observed in the final bicyclo[n.2.0]alkan-1-ol product. X-ray crystal structures of 253, 262 and 265 were obtained and a structural study showed that as the overall steric strain in the bicyclo[n.2.0]alkan-1-ol product is decreased there is a corresponding increase in product distribution in favour of bicyclo[n.2.0]alkan-1-ol formation in conjunction with increased yields. Selected substituted and functionalised ketones (2-methylcyclopentanone, 2,6-dimethylcyclohexanone, 2-methylcyclohexanone and 1,4-cyclohexanedione mono-ethylene ketal) also reacted in the cyclisation reaction to give bicyclo[n.2.0]alkan-1-ols 270, 271, 277, 278, 281, 282, 285 and 286 in conjunction with alkylated products 272, 279, 280, 283, 284 and 287. Incorporation of substitution at the bridgehead and C2 position had a role in the preference of the major stereochemical isomer observed for a bicyclo[n.2.0]alkan-1-ol (n = 3, 4). A structural comparison of the X-ray crystal structures of 278, 281 and 286 indicated that the pseudo chair conformation of the six-membered ring influenced ring torsion and bond angles in the bicyclo[4.2.0]octanol ring system. Two model studies were selected to illustrate the potential application of the cyclisation process as methodology towards natural product synthesis or complex ring systems. No bicyclo[n.2.0]alkan-1-ol formation was evident in an intramolecular example using the starting ketone 291 in which the electrophile is tethered to the ketone. 2,6-Dimethyl-2-cyclohexen-1-one 301 considered as a model study towards the synthesis of the antibiotic mellolide, upon reaction with phenyl vinyl sulfoxide and oxidation displayed poor reactivity. The novel bicyclo[2.2.2]octanones 303, 304 and 305 were formed in very low yields. The lack of reactivity of the ketones 2,6-dimethyl-2-cyclohexen-1-one, 1,2-cyclohexanedione and 1,4-cyclohexanedione towards bicyclo[n.2.0]alkan-1-ol formation suggested that conjugation in the enolate prior to reaction with phenyl vinyl sulfoxide was not favourable. The non-reactivity of these ketones and the hindered ketone camphor indicated the potential limitations to the cyclisation methodology. However, conversion of the ketal functionality of 286 to a ketone resulted in the formation of the functionalised bicyclo[4.2.0]octanol 288 providing positive indications for further synthetic applications.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Science
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9

Rogers, Bruce. "Approaches to cyclobutane containing cage compounds". Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299584.

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10

Skibiński, Maciej. "Effect of gem-difluorination on the conformation of selected hydrocarbon systems". Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/7058.

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Owing to its unique electronic properties, the CF₂ group has the potential to affect the conformation and polarity of molecules. The Introduction provides an overview of the conformational effects induced by the incorporation of fluorine into hydrocarbons, e.g. gauche effect, 1,3-C,F bond repulsion and angle deviation in organofluorine compounds. A summary of synthetic strategies for the introduction of the gem-difluoride motif into organic molecules is also presented. In order to explore the conformational impact of the CF₂ group in alicyclic hydrocarbon systems, cyclododecane was employed as the molecular framework. In 1,1,4,4- and 1,1,7,7- tetrafluorocyclododecanes, two CF₂ groups replaced CH₂ units within the square [3333] cyclododecane ring where the spacing enables the CF₂ groups to occupy adjacent or opposite corner locations. In the case of 1,1,6,6-tetrafluorocyclododecane, one of the CF₂ groups was forced to the edge position, which changes the ring conformation dramatically. Strategic incorporation of two CF₂ groups is shown to either stabilise or significantly alter the conformation of the cyclododecane framework, a revealing conformational preference of the CF₂ group to locate at the corner rather than the edge position of hydrocarbon rings. The study extends to larger cycloalkanes, rectangular [3434] cyclotetradecanes and square [4444] cyclohexadecanes. The target cycloalkanes bearing two CF₂ units were assembled through a novel synthetic route, employing ring-closing metathesis (RCM) as the key step. X-Ray structure analyses revealed that the CF₂ groups occupy exclusively corner locations of these rings too. The spacing between the CF₂ moieties dictates the overall ring conformations and offers a useful tool for controlling molecular arrangement. An accelerating role of the CF₂ group, relative to the CH₂ group, on the ring-closing metathesis of C5-substituted 1,8-nonadienes has also been studied. Remarkably, the CF₂ group exhibited a similar reaction rate to that observed for nonadienes bearing 1,3-dioxolane or dimethylmalonate groups. This effect was rationalised by the thermodynamic stability of the cycloheptene products, rather than a Thorpe-Ingold effect.

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Più fonti

Libri sul tema "Cycloalkanes"

1

Patai, Saul, e Zvi Rappoport, a cura di. Alkanes and Cycloalkanes (1992). Chichester, UK: John Wiley & Sons, Ltd, 1992. http://dx.doi.org/10.1002/0470034378.

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Saul, Patai, e Rappoport Zvi, a cura di. The Chemistry of alkanes and cycloalkanes. Chichester: Wiley, 1992.

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3

Moosavi, Sayed Mojtaba. Base-catalysed ring opening reactions of cycloalkanols. Manchester: Universityof Manchester, 1996.

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4

Drăguțan, Valerian. Catalytic polymerization of cycloolefins: Ionic, Ziegler-Natta and ring-opening metathesis polymerization. Amsterdam: Elsevier Science, 2000.

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5

Rappoport, Zvi, e Saul Patai. The Chemistry of Alkanes And Cycloalkanes. John Wiley & Sons Inc, 2006.

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6

Dragutan, Ileana, e Valerian Dragutan. Polymers From Cycloolefins. CRC, 2008.

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7

Hoffmann, Reinhard W. Dehydrobenzene and Cycloalkynes. Elsevier Science & Technology Books, 2012.

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8

Wang, Zhandong. Experimental and Kinetic Modeling Study of Cyclohexane and Its Mono-alkylated Derivatives Combustion. Springer, 2018.

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9

Wang, Zhandong. Experimental and Kinetic Modeling Study of Cyclohexane and Its Mono-alkylated Derivatives Combustion. Springer, 2019.

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10

Dragutan, V., e R. Streck. Catalytic Polymerization of Cycloolefins: Ionic, Ziegler-Natta and Ring-Opening Metathesis Polymerization. Elsevier Science & Technology Books, 2000.

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Capitoli di libri sul tema "Cycloalkanes"

1

Vollhardt, Peter, e Neil Schore. "Cycloalkanes". In Organic Chemistry, 218–85. New York: Macmillan Learning, 2014. http://dx.doi.org/10.1007/978-1-319-19197-9_4.

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2

Petrov, Alexander A. "Cycloalkanes (Naphthenes)". In Petroleum Hydrocarbons, 68–137. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71737-6_4.

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3

Ahluwalia, V. K., e Renu Aggarwal. "Conformations of Cycloalkanes". In Alicyclic Chemistry, 63–88. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36068-8_8.

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4

Ahluwalia, V. K., e Renu Aggarwal. "Properties of Cycloalkanes". In Alicyclic Chemistry, 17–25. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36068-8_4.

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5

Ahluwalia, V. K., e Renu Aggarwal. "Nomenclature of Cycloalkanes". In Alicyclic Chemistry, 3–6. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36068-8_2.

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6

Ahluwalia, V. K., e Renu Aggarwal. "Synthesis of Cycloalkanes". In Alicyclic Chemistry, 7–15. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36068-8_3.

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7

Bährle-Rapp, Marina. "C9–16 Alkanes/Cycloalkanes". In Springer Lexikon Kosmetik und Körperpflege, 84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_1540.

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8

Bährle-Rapp, Marina. "C11–15 Alkanes/Cycloalkanes". In Springer Lexikon Kosmetik und Körperpflege, 84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_1541.

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9

Rasmussen, Kjeld. "Applications: Alkanes and cycloalkanes". In Lecture Notes in Chemistry, 119–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-45591-9_10.

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10

Davies, A. G. "17.3.2 Radical cations of other cycloalkanes". In Phosphorus-Centered Radicals, Radicals Centered on Other Heteroatoms, Organic Radical Ions. Part 2, 223–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-87641-0_24.

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Atti di convegni sul tema "Cycloalkanes"

1

Otto, Jessica, Evan Davison e Randy Maglinao. "Synthesis of Cycloalkanes from Lignocellulosic Platform". In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/qbeo2379.

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Abstract: Catalytic hydrodeoxygenation of biooil is instrumental in producing sustainable aviation fuels, specifically cycloalkanes, from lignocellulosic materials. Cycloalkanes typically have higher energy densities, lower freeze points and higher flash points than conventional jet fuel. In our study, we compared hydrodeoxygenation of p-cresol using Pd/C and tandem hydrogenation-dehydration using Pd/C for hydrogenation and heteropolyacid on alumina catalyst for dehydration. All of the hydrodeoxygenation and hydrogenation trials were ran at 250°C and 600 psi of hydrogen gas while dehydration to cycloalkenes were conducted at 250°C and 50 psi of argon gas. Hydrodeoxygenation produced less than 20% mol of cyclic hydrocarbons while tandem hydrogenation-dehydration presented an overall yield nearing to 60% mol. Results from the gas chromatography-mass spectroscopy analysis suggested isomerization of cyclohexene to metylcyclopentene occurred in runs utilizing heteropolyacid on alumina catalyst.

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Haoer, R. S., K. A. Atan, A. M. Khalaf e R. Hasni. "Eccentric connectivity index of unicyclic graphs with application to cycloalkanes". In 2015 International Conference on Research and Education in Mathematics (ICREM7). IEEE, 2015. http://dx.doi.org/10.1109/icrem.2015.7357055.

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3

Panaye, A., J. P. Doucet, E. Feuilleaubois e S. Rahali El Azzouzi. "Neuromimetic approach to 13C NMR shifts prediction for methyl substituted cycloalkanes". In The first European conference on computational chemistry (E.C.C.C.1). AIP, 1995. http://dx.doi.org/10.1063/1.47784.

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4

Beteringhe, Adrian, e Ion Sima. "A new chemometric tool to predict the boiling points of some cycloalkanes". In 2016 8th International Conference on Electronics, Computers and Artificial Intelligence (ECAI). IEEE, 2016. http://dx.doi.org/10.1109/ecai.2016.7861154.

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5

"Renewable jet fuel range cycloalkanes from integrated catalytic processes of lignocellulosic biomass". In 2015 ASABE International Meeting. American Society of Agricultural and Biological Engineers, 2015. http://dx.doi.org/10.13031/aim.20152189641.

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6

Bellan, Josette R., e Panayotis Kourdis. "A Unified Reduction of Elementary Kinetic Mechanisms for n-Alkanes, Highly-Branched Alkanes and Cycloalkanes". In 55th AIAA Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-0834.

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7

Matveev, S. S., D. V. Idrisov e A. S. Semenikhin. "LAMINAR BURNING VELOCITY OF INDIVIDUAL HYDROCARBONS AND KEROSENE SURROGATES". In 9TH INTERNATIONAL SYMPOSIUM ON NONEQUILIBRIUM PROCESSES, PLASMA, COMBUSTION, AND ATMOSPHERIC PHENOMENA. TORUS PRESS, 2020. http://dx.doi.org/10.30826/nepcap9a-25.

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Surrogate fuel blends are often used in laboratory experiments and in combustion modeling to reproduce important characteristics of real transportation fuels. Fuel surrogates usually consist of a few class-representative hydrocarbons such as normal and branched alkanes, aromatics, and cycloalkanes. The complexity of a particular blend depends on the number of combustion properties (targets) taken into account. Most often, binary [1] and ternary blends were suggested as kerosene surrogates; yet, in some cases, a single species, n-decane [2], was used to make comparison with kerosene combustion characteristics such as burning velocity and, for example, to determine the emission of polycyclic aromatic hydrocarbons, complex 4-6 component surrogates.

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8

Carpani, Giovanna, Ilaria Pietrini, Massimiliano Baric, Francesca D'Ambrosi, Carlo Alberto Cova, Jahanzaib Akhtar e Melania Buffagni. "Bioremediation of Cutting Pits by Autochtonous Bacteria-Fungi Consortia". In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207921-ms.

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Abstract The aim of this work is to verify the potential of a consortium of autochthonous bacteria and fungi, isolated from samples of contaminated soils and water collected in a site containing cutting pits muds, in order to evaluate enhancing in biodegradation of hydrocarbons content. This innovative technique would take advantage of the synergistic effect of bacteria and fungi. In addition, this technique would allow to avoid the introduction of commercial allochthonous microflora for soil remediation and the use of chemical products for tool cleaning. Samples retrieved from a production site were used to isolate bacterial and unicellular fungal species able to grow on hydrocarbons were demonstrated to be able to degrade light and "diesel-like" hydrocarbons under laboratory conditions and in liquid cultures in less than a month. The activity of the consortium was also tested on crude oil, showing an overall degradation of the analyzable fraction greater of sixty percent after a 14-day incubation. Low C number linear hydrocarbons were the preferred substrate, but also cycloalkanes and mono- and di-aromatics seemed to be a good growth substrate. Probably, the action of enzymes secreted by fungal strains could enhance the degradation of complex molecules such as polycyclic aromatic hydrocarbons. Lab tests of consortium efficiency on mud samples are ongoing and an on-site pilot test is foreseen, to prove the activity of the consortium under the challenging field conditions. The development of fungal and bacterial consortia for degradation of complex hydrocarbon mixtures will represent an innovative approach that combines the action of enzymes secreted by fungi followed by the bacterial breakdown, a synergistic effect which could potentially increase the rate and effectiveness of hydrocarbons decontamination.

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Dagaut, P., A. Mze´-Ahmed, K. Hadj-Ali e P. Die´vart. "Synthetic Jet Fuel Combustion: Experimental and Kinetic Modeling Study". In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45234.

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Fischer-Tropsch liquid fuels synthesized from syngas, also called synthetic paraffinic jet fuel (SPK), can be used to replace conventional petroleum-derived fuels in jet engines. Whereas currently syngas is mostly produced from coal of natural gas, its production from biomass has been reported. These synthetic liquid fuels contain a very high fraction of iso-alkanes, while conventional jet fuels contain large fractions of n-alkanes, cycloalkanes (naphtenes), and aromatics. In that contest, a jet-stirred reactor (JSR) was used to study the kinetics of oxidation of a 100% SPK and a 50/50 SPK/Jet A-1mixture over a broad range of experimental conditions (10 atm, 560 to 1030K, equivalence ratios of 0.5 to 2, 1000 ppm of fuel). The temperature was varied step-wise, keeping the mean residence time in the JSR constant and equal to 1s. Three combustion regimes were observed over this temperature range: the cool-flame oxidation regime (560–740K), the negative temperature coefficient (NTC) regime (660–740K), and the high-temperature oxidation regime (>740K). More than 15 species were identified and measured by Fourier transform infrared spectrometry (FTIR), gas chromatography/mass spectrometry (CG/MS), flame ionization detection (FID), and thermal conductivity detection (TCD). The results consisting of concentration profiles of reactants, stable intermediates and products as a function of temperature showed similar kinetics of oxidation for the fuels considered, although the 100% SPK was more reactive. A surrogate detailed chemical kinetic reaction mechanism was used to model these experiments and ignition experiments taken from the literature. The kinetic modeling showed reasonable agreement between the data and the computations whereas model improvements could be achieved using more appropriate surrogate model fuels. Kinetic computations involving reaction paths analyses and sensitivity analyses were used to interpret the results.

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Masmui, Neneng Windayani, Ferli Septi Irwansyah e Efa Nur Asyiah. "Making Augmented Reality Learning Media In Conformation of Alkane and Cycloalkane Concepts". In 2019 IEEE 5th International Conference on Wireless and Telematics (ICWT). IEEE, 2019. http://dx.doi.org/10.1109/icwt47785.2019.8978227.

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