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Littérature scientifique sur le sujet « Cyclohexane »

Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 1 juin 2024

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Articles de revues sur le sujet "Cyclohexane"

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Guo, Jia Neng, Jin Zhi Lin, Xin Liu, Qi Wei Wang, Ge Gao, Xiang Zhang, Xin Ge Shi, Bei Yang et Hai Bo Jin. « The Progress of Catalyst for Cyclohexane Dehydrogenation Processes ». Advanced Materials Research 953-954 (juin 2014) : 1261–68. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.1261.

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Cyclohexane dehydrogenation is an important process in the petrochemical industry, chemical raw material such as cyclohexanol, cyclohexanone,benzene and cyclohexene can be produced from which.Divided cyclohexane dehydrogenation into catalytic dehydrogenation or oxidative dehydrogenation, homogeneous or heterogeneous reaction. Summarized vary catalysts, active constituent and process conditions in dehydrogenation process.
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Kurganova, E. A., A. S. Frolov, S. A. Kanaev, G. N. Koshel, A. A. Petukhov, G. V. Rybina, V. V. Plakhtinskii, V. S. Kabanova et A. A. Smurova. « Epoxidation of cyclohexene with cyclohexyl hydroperoxide ». Fine Chemical Technologies 18, no 6 (18 janvier 2024) : 505–16. http://dx.doi.org/10.32362/2410-6593-2023-18-6-505-516.

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Objectives. To investigate the regularities of the process of joint production of epoxycyclohexane, cyclohexanol, and cyclohexanone using the cyclohexene epoxidation reaction with cyclohexyl hydroperoxide in the presence of an ammonium paramolybdate catalyst, representing an alternative to the method of cyclohexanol and cyclohexanone synthesis by alkaline catalytic decomposition of cyclohexyl hydroperoxide.Methods. The qualitative and quantitative analysis of the obtained intermediate and target compounds was determined using modern physicochemical research methods: gas–liquid chromatography using the Chromatec-Crystal 5000.2 hardware and software complex with a flame ionization detector and infrared spectroscopy on an RX-1 infrared Fourier spectrometer. The content of hydroperoxide in the oxidation products was determined using iodometric titration, while the carboxylic acid content was determined by the titrimetric method based on the neutralization reaction.Results. The presented method for obtaining cyclohexanol and cyclohexanone together with epoxycyclohexane by the reaction of cyclohexene epoxidation with cyclohexyl hydroperoxide containing cyclohexane in the products of high-temperature liquid-phase oxidation is experimentally substantiated. The influence of various technological parameters on the process of liquid-phase oxidation of cyclohexane to hydroperoxide is described. The conditions for carrying out this reaction are determined to ensure the achievement of a content of cyclohexyl hydroperoxide of 1.5 wt % in the products of oxidation. The regularities of the epoxidation reaction of the synthesized cyclohexyl hydroperoxide with cyclohexene in the presence of an ammonium paramolybdate catalyst are analyzed.Conclusions. Epoxidation of cyclohexene with cyclohexyl hydroperoxide produced epoxycyclohexane at a yield of 80–90% and a conversion of cyclohexane hydroperoxide of 85%.
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Frolov, A. S., E. A. Kurganova, E. M. Yarkina, N. V. Lebedeva, G. N. Koshel et A. S. Kalenova. « INTENSIFICATION OF THE CYCLOHEXANE LIQUID PHASE OXIDATION PROCESS ». Fine Chemical Technologies 13, no 4 (28 août 2018) : 50–57. http://dx.doi.org/10.32362/2410-6593-2018-13-4-50-57.

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Liquid-phase oxidation of cyclohexane to cyclohexanol and cyclohexanone was studied in the absence of solvents under an air pressure of 0.5-5 MPa, in the temperature range 115-150 °C, catalyzed by N-hydroxyphthalimide (N-HPI). It was established for the first time that the use of N-HPI as a catalyst in place of the conventionally used metal salts of variable valence allowed a 2-3-fold increase in the conversion of the initial hydrocarbon and selectivity from 70-75 to 90%. The combined use of N-HPI with cobalt(II) acetate results in an additional increase in the conversion of cyclohexane by 30-40%, the selectivity of cyclohexanol and cyclohexanone formation to 94-97%, which seems to be due to the synergistic effect between the two components of the catalyst. The mechanism of catalytic oxidation of cyclohexane to cyclohexanol and cyclohexanone is discussed. It has been suggested that N-HPI plays a dual role in the oxidation of cyclohexane: it catalyzes the conversion of cyclohexane to cyclohexanol and cyclohexanone and, on the other hand, promotes the conversion of cyclohexanol to cyclohexanone, thereby substantially reducing the formation of adipic acid and its esters, by-products of the reaction, and increases selectivity of oxidation. This also explains the unusually high (1.3-1.5 : 1) ketone: alcohol ratio in the oxidation products of cyclohexane in the presence of N-HPI. The high selectivity of the formation of the desired products, the conversion of cyclohexane, the moderate temperature, the available catalyst, suggest that this method of oxidizing cyclohexane to cyclohexanol and cyclohexanone may be of interest for further practical use.
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Wang, Lei, Ming Qiao Zhu, Jian Gang Lu et Hong Ding Hu. « Uncatalyzed Oxidation of Cyclohexane in the Microchannels ». Key Engineering Materials 562-565 (juillet 2013) : 1542–47. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.1542.

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The oxidation of cyclohexane in the microchannels not only improves the safety of the reaction, but also the performance of the oxidation reaction. Different gas-liquid micro mixers were used for the mixing of gas and liquid before entering into microchannels, and SIMM-V2 performed best of all. Excellent slug/plug flow can be formed in the microchannels after mixing in the gas-liquid micro mixer when the molar ratio of oxygen to cyclohexane is less than 0.5:1. The conversion of cyclohexane increased as the residence time increased, but the selectivity of cyclohexanol and cyclohexanone increased first and then decreased. At the reaction temperature of 200 °C, with the flow rate of the solvent isopropanol being 1 mL/min and the molar ratio of oxygen to cyclohexane being 0.15:1, both the conversion of cyclohexane and selectivity of cyclohexanol and cyclohexanone increased with the increase of pressure. The conversion of cyclohexane and selectivity of cyclohexanol and cyclohexanone reached 10.10% and 66.93% respectively at the pressure of 8 MPa. It is indicated that the new process by use of uncatalyzed cyclohexane oxidation in the microchannels will have very attractive prospects in the improvement of the safety, intensification of the gas-liquid mass transfer and obtaining good reactive performance. Therefore, the technology shows good potential in industrial applications.
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Aghamammadova, S. A. « MECHANISM OF BIOMIMETIC OXIDATION OF CYCLOHEXANE TO CYCLOHEXANONE BY HYDROGEN PEROXIDE ». Azerbaijan Chemical Journal, no 1 (9 avril 2021) : 61–66. http://dx.doi.org/10.32737/0005-2531-2021-1-61-66.

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The process of gas-phase oxidation of cyclohexane was studied in the presence of a heterogeneous biomimetic catalyst (per-FTPhPFe(III)OH/Al2O3), at 130–2500C, in which high yields of cyclohexanone and cyclohexanol were obtained up to 25.2% with a selectivity of ~80% at a cyclohexane conversion of 34%. The mechanism of the conversion of cyclohexane to cyclohexanone has been studied in detail, and the coherently synchronized character of the reaction proceeding is shown
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Zhang, Jiao Jing, Hua Lin Song, Jian Wang et Hua Song. « Experimental Study on Catalytic Oxidation of Cyclohexane Catalyzed by Phosphomolybdic Acid ». Advanced Materials Research 549 (juillet 2012) : 411–14. http://dx.doi.org/10.4028/www.scientific.net/amr.549.411.

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The catalytic oxidation of cyclohexane to cyclohexanone and cyclohexanol using hydrogen peroxide over phosphomolybdic acid were studied. Factors such as the amount of catalyst, amount of the oxidant (H2O2), reaction temperature and reaction time were investigated. The conversion of cyclohexane was 35.35%, the total selectivity to cyclohexanone and cyclohexanol was 97.68% at a reaction temperature of 70 °C, reaction time of 8 h, 10 mL of acetone, 0.01 g of phosphomolybdic acid and 0.5 mL of hydrogen peroxide.
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Henríquez, Adolfo, Victoria Melin, Nataly Moreno, Héctor D. Mansilla et David Contreras. « Optimization of Cyclohexanol and Cyclohexanone Yield in the Photocatalytic Oxofunctionalization of Cyclohexane over Degussa P-25 under Visible Light ». Molecules 24, no 12 (15 juin 2019) : 2244. http://dx.doi.org/10.3390/molecules24122244.

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The sustainable transformation of basic chemicals into organic compounds of industrial interest using mild oxidation processes has proved to be challenging. The production of cyclohexanol and cyclohexanone from cyclohexane is of interest to the nylon manufacturing industry. However, the industrial oxidation of cyclohexane is inefficient. Heterogeneous photocatalysis represents an alternative way to synthesize these products, but the optimization of this process is difficult. In this work, the yields of photocatalytic cyclohexane conversion using Degussa P-25 under visible light were optimized. To improve cyclohexanol production, acetonitrile was used as an inert photocatalytic solvent. Experiments showed that the use of the optimized conditions under solar light radiation did not affect the cyclohexanol/cyclohexanone ratio. In addition, the main radical intermediary produced in the reaction was detected by the electronic paramagnetic resonance technique.
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Alnefaie, Reem S., Mohamed Abboud, Abdullah Alhanash et Mohamed S. Hamdy. « Efficient Oxidation of Cyclohexane over Bulk Nickel Oxide under Mild Conditions ». Molecules 27, no 10 (14 mai 2022) : 3145. http://dx.doi.org/10.3390/molecules27103145.

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Nickel oxide powder was prepared by simple calcination of nickel nitrate hexahydrate at 500 °C for 5 h and used as a catalyst for the oxidation of cyclohexane to produce the cyclohexanone and cyclohexanol—KA oil. Molecular oxygen (O2), hydrogen peroxide (H2O2), t-butyl hydrogen peroxide (TBHP) and meta-chloroperoxybenzoic acid (m-CPBA) were evaluated as oxidizing agents under different conditions. m-CPBA exhibited higher catalytic activity compared to other oxidants. Using 1.5 equivalent of m-CPBA as an oxygen donor agent for 24 h at 70 °C, in acetonitrile as a solvent, NiO powder showed exceptional catalytic activity for the oxidation of cyclohexane to produce KA oil. Compared to different catalytic systems reported in the literature, for the first time, about 85% of cyclohexane was converted to products, with 99% KA oil selectivity, including around 87% and 13% selectivity toward cyclohexanone and cyclohexanol, respectively. The reusability of NiO catalyst was also investigated. During four successive cycles, the conversion of cyclohexane and the selectivity toward cyclohexanone were decreased progressively to 63% and 60%, respectively, while the selectivity toward cyclohexanol was increased gradually to 40%.
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Zhang, Jiao Jing, Bing Bai et Hua Song. « Experimental Study on Cyclohexane by Catalytic Oxidation Using H2O2/Ferrous Sulfate ». Advanced Materials Research 233-235 (mai 2011) : 1288–91. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.1288.

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Catalytic oxidation of cyclohexane to cyclohexanone and cyclohexanol using hydrogen peroxide over ferrous sulfate catalyst at atmospheric condition was studied. Effect of the solvent volume, catalyst amount, hydrogen peroxide volume, reaction temperature, reaction time on reaction was investigated. Results showed that using 10 mL of acetone, 0.02 g of a ferrous sulfate and 0.5 mL of hydrogen peroxide at thereaction temperature of 80 °C for 8 h, the conversion of cyclohexane was 35.35%, the total selectivity of cyclohexanone and cyclohexanol was 94.06%.
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Kirkwood, Kathleen, et S. David Jackson. « Hydrogenation and Hydrodeoxygenation of Oxygen-Substituted Aromatics over Rh/silica : Catechol, Resorcinol and Hydroquinone ». Catalysts 10, no 5 (22 mai 2020) : 584. http://dx.doi.org/10.3390/catal10050584.

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The hydrogenation and hydrodeoxygenation (HDO) of dihydroxybenzene isomers, catechol (1,2-dihydroxybenzene), resorcinol (1,3-dihydroxybenzene) and hydroquinone (1,4-dihydroxybenzene) was studied in the liquid phase over a Rh/silica catalyst at 303–343 K and 3 barg hydrogen pressure. The following order of reactivity, resorcinol > catechol > hydroquinone (meta > ortho > para) was obtained. Kinetic analysis revealed that catechol had a negative order of reaction whereas both hydroquinone and resorcinol gave positive half-order suggesting that catechol is more strongly adsorbed. Activation energies of ~30 kJ·mol−1 were determined for catechol and hydroquinone, while resorcinol gave a value of 41 kJ·mol−1. Resorcinol, and similarly hydroquinone, gave higher yields of the hydrogenolysis products (cyclohexanol, cyclohexanone and cyclohexane) with a cumulative yield of ~40%. In contrast catechol favoured hydrogenation, specifically to cis-1,2-dihydroxycyclohexane. It is proposed that cis-isomers are formed from hydrogenation of dihydroxycyclohexenes and high selectivity to cis-1,2-dihydroxycyclohexane can be explained by the enhanced stability of 1,2-dihydroxycyclohex-1-ene relative to other cyclohexene intermediates of catechol, resorcinol or hydroquinone. Trans-isomers are not formed by isomerisation of the equivalent cis-dihydroxycyclohexane but by direct hydrogenation of 2/3/4-hydroxycyclohexanone. The higher selectivity to HDO for resorcinol and hydroquinone may relate to the reactive surface cyclohexenes that have a C=C double bond β-γ to a hydroxyl group aiding hydrogenolysis. Using deuterium instead of hydrogen revealed that each isomer had a unique kinetic isotope effect and that HDO to cyclohexane was dramatically affected. The delay in the production of cyclohexane suggest that deuterium acted as an inhibitor and may have blocked the specific HDO site that results in cyclohexane formation. Carbon deposition was detected by temperature programmed oxidation (TPO) and revealed three surface species.
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Thèses sur le sujet "Cyclohexane"

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Sutton, Peter William. « Ketene cycloadditions to cyclohexa-3,5-diene-cis-1,2-diol acetals : preparation of polyhydroxylated cyclohexane derivatives ». Thesis, University of Exeter, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294477.

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Lima, Liliane Schier de. « Oxidação aerobica de cicloexano e cicloexeno usando carvão ativado como catalisador ». [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249522.

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Orientador: Ulf Friedrich Schuchardt
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica
Made available in DSpace on 2018-08-06T15:18:09Z (GMT). No. of bitstreams: 1 Lima_LilianeSchierde_M.pdf: 699085 bytes, checksum: 864f8f983b1935cceb9fe8d839e3fcf4 (MD5) Previous issue date: 2006
Resumo: O interesse nas reações de oxidação do cicloexano e cicloexeno tem sido foco de muitas pesquisas nos últimos anos, objetivando a busca de reações com maiores rendimentos e seletividades. A rota sintética comercialmente utilizada oxida o cicloexano a cicloexanol e cicloexanona com rendimentos muito baixos (em torno de 4 %), fomentando ainda mais a busca por rotas alternativas de oxidação. O presente trabalho estudou a oxidação direta de cicloexano e cicloexeno a 140ºC e pressões de até 50 bar usando carvões ativados de origem mineral e vegetal como catalisadores. O carvão ativado, por se tratar de um material com uma alta área superficial e de característica hidrofóbica, é compatível com reações de hidrocarbonetos e, então, foi utilizado como catalisador para estas oxidações. As oxidações diretas do cicloexano, nas condições em que foram realizadas, apresentaram resultados de conversão abaixo de 1% e, em alguns casos, com resultados irreprodutíveis. Para as reações de oxidação do cicloexeno, além de algumas mudanças nas condições das reações, foram utilizados como catalisadores carvão ativado impregnados com Pd. As reações apresentaram boas conversões, que variaram de 5 a 90%. Os carvões minerais previamente tratados com ácido clorídrico conduziram a melhores resultados nas oxidações catalíticas do cicloexeno, porém um comportamento inverso foi observado para os carvões vegetais. O Pd impregnado favoreceu a formação da bifenila, alcançando 100% de seletividade para este produto quando usou-se um carvão comercial contendo 5% de Pd.
Abstract: The concerning about cyclohexane and cyclohexene oxidation reactions has been subject of many researches lately, in order to find yielder and more selective reactions. The more common synthetic path at the industry, oxidate the cyclohexane to cyclohexanol and cyclohexanone with very low yield (almost 4%), what stimulates the researches looking for alternatives oxidations paths. The present work has studied the straight oxidation from the cyclohexane and cyclohexene in a temperature of 140°C and pressures until 50 bars using activated carbon, mineral and vegetal origins, as a catalyser. Due the activated carbon is a material with very high surface area and it has also hydrophobic characteristics, it is compatible with hydrocarbons reactions, and then it has been used here as catalyser to this oxidations. The straight cyclohexane oxidations, in that conditions, has showed conversion results lower than 1% and, in some cases, with non reproducible results. To the cyclohexene oxidation reactions, besides some changes in the reactions conditions, it has been used as a catalyser, activated carbon impregnated with Pd. Those reactions showed better conversions, between 5% and 90%. The mineral carbons, previously treated with chloride acid, lead to better results in the catalytic oxidation of the cyclohexene, although an inverse behavior has been observed to the vegetal carbons. The Pd impregnation has helped the biphenyl production, reaching 100% selectivity to this product when using a carbon containing 5% of Pd.
Mestrado
Quimica Organica
Mestre em Química
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Mitropetros, Konstantinos. « Shock induced bubble explosions in liquid cyclohexane ». [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974965936.

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Graham, Isla Patricia. « Chemoenzymatic approches to cyclohexane based natural products ». Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485199.

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Chapter 1 provides an overview of cis-dihydrodiols. The biological aspects of enzymatic hydroxylation are discussed, followed by the important stereochemical aspects of cis-diol metabolites. A selection of chemoenzymatic approaches to important natural products from cis-dihydrodiols is given. Chapter 2 introduces the Amaryllidaceae and Sceletium alkaloids, giving an insight into their biological sigIJificance. Previous approaches to important members of both alkaloid classes are given. Synthesis of a ke~ intermediate for the synthesis of mesembranol is described. The development of successful conditions to effect a Suzuki reaction of cis-dihydrodiols forms a key component of the synthetic strategy. Following on from this, Diels-Alder reactions of substrates derived from cisdihydrodiols, studies towards a resolving agent and biotransformation studies are discussed. Chapter 3 is devoted to synthesis of cis-3a-aryloctahydroindole nuclei, common to many Amaryllidaceae alkaloids. Previous approaches followed by our synthetic endeavours to gain access to this nucleus from cis-dihydrodiols are outlined. Chapter 4 begins with an introduction to 2-deoxystreptamine, an important aminocyclitol. Previous approaches to 2-deoxystreptamine are discussed. An important intermediate in several synthe~es is identified, followed by approaches to it from cis-dihydrodiols. The second half of the chapter is concerned with synthesis of valeinamine. Synthesis of a 3,4-trans-diol from iodobenzene-cis-diol is outlined. Chapter 5 contains full experimental details, including spectral and analytical data, for the compounds synthesised during this work.
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Durie, Alastair J. « Multivicinal fluorine substitution of the cyclohexane ring ». Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/8080.

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Highly polar organic fluorinated motifs are of interest in materials chemistry, for example, in liquid crystal applications. Cyclohexane is an important and widely used structural motif within organic chemistry. Work has been carried out to prepare single stereoisomers of multivicinal fluorinated cyclohexanes, a class of compounds that has not been previously produced. A synthesis of the all-syn-1,2,3,4-tetrafluorocyclohexane, in 9 steps from cyclohexa-1,3-diene will be presented. The ¹⁹F NMR spectra of the all-syn-1,2,3,4-tetrafluorocyclohexane shows interesting dynamic conformational effects. This is a small polar organic molecule, which was crystalline at room temperature. The structure of the compound was confirmed by single crystal X-ray diffraction studies. The synthesis of the all-syn-1,2,4,5-tetrafluorocyclohexane from cyclohexa-1,4-diene is also presented. The synthesis of a single diastereoisomer of 1,2,3,4,5,6-hexafluorocyclohexane, derived from benzene in 5 steps, is presented. As with the tetrafluoro compounds, the ¹⁹F NMR spectra of this compound shows dynamic conformational effects. The structure of the compound was confirmed by single crystal X-ray diffraction studies. The 1,2,4,5-tetrafluorocyclohexane motif was elaborated to contain a phenyl group, producing “rod-like” molecules. This motif was synthesised in view of potential applications for liquid crystalline materials.
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Mpuhlu, Batsho. « Vapour phase dehydrogenation of cyclohexane on microstructured reactors ». Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/8661.

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The work that is described in this thesis forms part of the research and development projects at InnoVenton: NMMU Institute of Chemical Technology in collaboration with Sasol Technologies. The broader view of the project was testing on the so-called “Small Production Platforms” (SPP’s). In particular the main aim of this study was to investigate the effect of micro-structuring on the heterogeneous catalysed, vapour-phase oxidative dehydrogenation of cyclohexane in the presence of air. Ground work studies were done to provide a proper comparison of the micro-structured reactor with a traditional fixed-bed reactor. These included evaluation of a proper vanadium pyrophosphate catalyst for the reaction, testing of reaction parameters for the oxidative dehydrogenation reaction on a fixed-bed reactor and lastly comparing the performance of the micro-structured reactor to that of the fixed-bed reactor Various vanadium pyrophosphate catalysts that were tested for activity included: bulk (VO)2P2O7, bulk (VO)2P2O7 promoted with Fe, (VO)2P2O7 supported on -Al2O3 and Fe promoted (VO)2P2O7 supported on -Al2O3. These catalysts showed significant differences in TOF, however it was not conclusive from the results whether these differences may be traced to increased activity for dehydrogenation for different catalysts since all reactions were run under conditions of oxygen deficiency. It is, however, clear that Fe promotion significantly increase activity, irrespective of the relative degrees of oxidative dehydrogenation and normal dehydrogenation. The Fe promoted catalyst was further tested for long term stability in-view of using it as the catalyst in the micro-structured reactor. These studies showed the catalyst to have a high degree of stability with minimal structural changes under the reaction conditions used. Various response surface models describing the variation in each of the cyclohexane conversion, cyclohexene selectivity, and benzene selectivity, respectively when changing reaction condition, were derived by means of multiple regression. To obtain some idea of the degree and nature of the normal dehydrogenation reaction, the amount of deficit oxygen was estimated from the measured results for cyclohexane conversion and cyclohexene and benzene selectivities. These estimated values were also modelled as described above. The regression models were used to interpret specific trends in the responses for the oxidative dehydrogenation of cyclohexane and account for the oxygen deficit in the system. The performance of a fixed bed tubular reactor (FBR) and micro-structured sandwich reactor (MSSR) were compared over an Fe promoted vanadium pyrophosphate. Reactor performance was evaluated by varying specific reaction conditions (temperature and space velocity). Subsequently the turn-over frequencies, conversion and selectivities from the two reactors were compared. The conversion achieved in the micro-structured reactor was observed to be significantly higher than that achieved in the fixed-bed reactor at all reaction parameters. This is despite the fact that the total amount of catalyst in the micro-structured reactor is approximately 5 times less than that used in the fixed bed reactor. In addition, the contact time (1/MHSV) in the micro-structured reactor is also significantly shorter than in the fixed-bed reactor.
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Morin, Cynthia. « Étude de l'adsorption du cyclohexane et du cyclohexanone sur une surface polycristalline de carbure de molybdène, ß-Mo¦2C ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ49040.pdf.

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Trower, M. K. « The oxidation of cyclohexane by a Xanthobacter species ». Thesis, Nottingham Trent University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356463.

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Carcenac, Yvan. « Synthèse et étude de dérivés fluorés du cyclohexane ». Versailles-St Quentin en Yvelines, 2005. http://www.theses.fr/2005VERS0042.

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La thèse présentée est une étude des équilibres conformationnels de cyc10hexanes 1,4¬disubstitués de stéréoisomérie cis, porteurs d'un groupement fluoré (CF3, C2Fs, CFH2, CF2H, OCF3 et SCF3) et d'un groupement alkyle ou aryle. Dans une première partie est abordée la synthèse des cyc10hexanes fluorés: Les composés porteurs des substituants trifluorométhyle, entafluoroéthyle et trifluorométhylthio ont été obtenus par utilisation de réactifs perfluorés. Les composés substitués par des groupements fluorométhyle, difluorométhyle et trifluorométhoxy ont été synthétisés par réactions de fluorations. La mise au point des différentes synthèses est décrite. Dans une seconde partie, les équilibres conformationnels de ces composés sont étudiés par RMN 19F à température variable. L'énergie nécessaire au passage des substituants de la position équatoriale à la position axiale nous permet d'évaluer les interactions stériques et électroniques des différents groupements avec leur environnement. Les effets des substituants sur les déplacements chimiques en RMN BC sont également commentés
The aim of this thesis was to study conformational equilibria of cis 1,4-disubstituted cyc1ohexanes, bearing a fluorinated group (CP3, C2Ps, CPH2, CP2H, OCP3 and SCP3) and an aIkyI or aryl group. Ln the first part of this manuscript, the synthe sis of fluorinated cyc10hexanes is described : compounds bearing trifluoromethyIe, pentafluoroethyIe or trifluoromethylthio. Substituents were obtained by the use of perfluorinated reagents, while compounds possessing a fluoromethyIe, difluoromethyle or trifluoromethoxy group were synthesized by fluorination reactions. The deveIopment ofthose various approches is described. Ln a second part, conformational analysis of these compounds was studied by 19p NMR at various temperature. The energy necessary for the passage of the substituents from the equatorial position to the axial position allowed us to evaluate the steric and electronic interactions of the different groups with their environment. The effects of the substituents on the chemical shifts in BC NMR are also commented
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Razafitianamaharavo, Angelina. « Étude structurale du film de cyclohexane physisorbé sur graphite : Étude thermodynamique et structurale du film mixte (krypton-cyclohexane) physisorbe sur graphite ». Nancy 1, 1989. http://www.theses.fr/1989NAN10080.

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La caractérisation structurale du cyclohexane adsorbe sur graphite a été effectuée entre 77**(O)K et 260**(O)K par diffraction de neutrons et de rayons X. Elle a permis de proposer un diagramme de phases 2D rendant compte de trois structures solides qui sont par ordre de densité croissante, commensurable, hexagonale incommensurable et rectangulaire centrée
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Livres sur le sujet "Cyclohexane"

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Canada. Environmental Protection Programs Directorate. Technical Services Branch. et Canada Environmental Protection Service, dir. Cyclohexane. Ottawa : The Service, 1985.

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Bíliková, Anna. Stanovenie cyklohexanolu a cyklohexanónu vo vodách. Bratislava : Výskumný ústav vodného hospodárstva, 1988.

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Canada. Environmental Protection Programs Directorate. Technical Services Branch., dir. Cyclohexane : Environmental and technical information for problem spills. Ottawa, Ont : Environment Canada, Environmental Protection Service, 1985.

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S, Fairhurst, Standring P, Cross H et Great Britain. Health and Safety Executive., dir. Cyclohexane, Cumene, Para-dichlorobenzene (p-DCB), Chlorodifluoromethane (CFC 22). London : HMSO, 1991.

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Nesterov, S. V. Dicyclohexanocrown ethers : From synthesis to radiochemical applications. New York : Nova Science Publishers, 2011.

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Wang, Zhandong. Experimental and Kinetic Modeling Study of Cyclohexane and Its Mono-alkylated Derivatives Combustion. Singapore : Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5693-2.

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Laboratory, Occupational Medicine and Hygiene. Rubber fume in air measured as 'total particulates' and 'cyclohexane soluble material' : Laboratory method using filters and gravimetric estimation. Bootle : Health and Safety Executive, 1987.

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Laboratory, Occupational Medicine and Hygiene. Coal tar pitch volatiles : measurement of particulates and cyclohexane soluble materialin air : Laboratory method using filters and gravimetric estimation. Bootle : Health and Safety Executive, 1990.

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Occupational Medicine and Hygiene Laboratory. Newspaper print rooms : measurement of total particulates and cyclohexane soluble material in air : Laboratory method using filters and gravimetric estimation. Bootle : Health and Safety Executive, 1987.

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Staffen, Kent. Metal vapour reduction of cyclohexanone. Sudbury, Ont : Laurentian University, 1994.

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Chapitres de livres sur le sujet "Cyclohexane"

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Bährle-Rapp, Marina. « Cyclohexane ». Dans Springer Lexikon Kosmetik und Körperpflege, 137. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_2590.

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Gooch, Jan W. « Cyclohexane ». Dans Encyclopedic Dictionary of Polymers, 189. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_3239.

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Hallenbeck, William H., et Kathleen M. Cunningham-Burns. « Cyclohexane ». Dans Pesticides and Human Health, 44. New York, NY : Springer New York, 1985. http://dx.doi.org/10.1007/978-1-4612-5054-8_24.

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Grozin, Andrey. « Cyclohexane ». Dans Introduction to Mathematica® for Physicists, 193–208. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00894-3_24.

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Howard, Philip H., Gloria W. Sage, William F. Jarvis et D. Anthony Gray. « Cyclohexane ». Dans Handbook of Environmental Fate and Exposure Data For Organic Chemicals, Volume II, 120–28. Boca Raton : CRC Press, 2023. http://dx.doi.org/10.1201/9781003418863-18.

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Winkelmann, Jochen. « Diffusion coefficient of cyclohexene in cyclohexane ». Dans Diffusion in Gases, Liquids and Electrolytes, 763. Berlin, Heidelberg : Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-540-73735-3_543.

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Gooch, Jan W. « Methyl Cyclohexane ». Dans Encyclopedic Dictionary of Polymers, 457. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7408.

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Wohlfarth, Ch. « Viscosity of cyclohexane ». Dans Supplement to IV/18, 377–80. Berlin, Heidelberg : Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_197.

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Wohlfarth, Christian. « Viscosity of cyclohexane ». Dans Viscosity of Pure Organic Liquids and Binary Liquid Mixtures, 226–27. Berlin, Heidelberg : Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49218-5_203.

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Howard, J. A. « In Cyclohexane Oxidation ». Dans Inorganic Reactions and Methods, 402–4. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145319.ch170.

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Actes de conférences sur le sujet "Cyclohexane"

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Bezborodov, Vladimir, Roman S. Dabrowski, Genadz Sasnouski, V. Lapanik et Jerzy Dziaduszek. « New LC cyclohexene and cyclohexane derivatives : LC compositions on their base ». Dans XIV Conference on Liquid Crystals, Chemistry, Physics, and Applications, sous la direction de Jolanta Rutkowska, Stanislaw J. Klosowicz et Jerzy Zielinski. SPIE, 2002. http://dx.doi.org/10.1117/12.472203.

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Tykarski, W., Jerzy Dziaduszek, Roman S. Dabrowski et Vladimir Bezborodov. « Synthesis and mesogenic properties of compounds with lateral substituted cyclohexane and cyclohexene ring ». Dans Liquid Crystals, sous la direction de Marzena Tykarska, Roman S. Dabrowski et Jerzy Zielinski. SPIE, 1998. http://dx.doi.org/10.1117/12.301314.

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Nagadi, Mahmoud M., et A. A. Naqvi. « Energy resolution measurements of cyclohexane and deuterated-cyclohexane scintillators for monoenergetic γ-rays ». Dans Fifth International Conference on Applications of Nuclear Techniques : Neutrons in Research and Industry, sous la direction de George Vourvopoulos. SPIE, 1997. http://dx.doi.org/10.1117/12.267866.

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Anikeenko, Alexey, Alexandra Kim et Nikolai Medvedev. « Delaunay Simplexes in Liquid Cyclohexane ». Dans 2009 Sixth International Symposium on Voronoi Diagrams (ISVD). IEEE, 2009. http://dx.doi.org/10.1109/isvd.2009.10.

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Melker, Alexander I., Dimitri A. Kornilov, Tatiana V. Vorobyeva et Alexander Ivanov. « Conformational transitions in cyclohexane and benzol ». Dans SPIE Proceedings, sous la direction de Alexander I. Melker. SPIE, 2003. http://dx.doi.org/10.1117/12.517945.

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Maloney, Thad C., et Hannu Paulapuro. « Thermoporosimetry of Pulp Fibers ». Dans The Science of Papermaking, sous la direction de C. F. Baker. Fundamental Research Committee (FRC), Manchester, 2001. http://dx.doi.org/10.15376/frc.2001.2.897.

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This paper covers the use of thermoporosimetry to measure the pore size distribution (PSD) of pulp fibers. Thermoporosimetry is based on the melting temperature depression of an absorbate in a porous structure. A discreet or “step” melting procedure, rather than the usual continuous method, is used to melt the absorbate. This method eliminates thermal lag and gives the high temperature accuracy required for measuring large pores. Measurement of water-saturated chemical pulp fibers using this technique, combined with solute exclusion, indicates a bimodal distribution of cell wall pores. The interpretation of data from water-saturated fibers is complicated by several factors: 1) distortion of the cell wall by ice crystal growth; 2) the depression of water’s melting temperature by osmotic pressure; and 3) inadequate range to cover the larges pores. One way to correct these problems is by replacing the water with cyclohexane. The major disadvantage of this approach is that the cell wall contracts in cyclohexane and its pore structure may change in other ways which are not understood. Like water, the cyclohexane analysis shows a bimodal distribution of pores. The smaller pores, “micropores”, are less than about 5 nm in diameter, the “macropores” are about 15–700 nm. It was found that there is a quantity of cyclohexane in the cell wall which does not freeze. Analysis of nonfreezing cyclohexane indicates a surface area of about 400 m2/g for kraft pulp. The cyclohexane method is very suitable for studying beating, which primarily involves the opening of larger pores.
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Jones, Francis, Anand Kuppusamy et Ai-Ping Zheng. « Dehydrogenation of cyclohexane to benzene in microreactors ». Dans Symposium on Micromachining and Microfabrication, sous la direction de Chong H. Ahn et A. Bruno Frazier. SPIE, 1999. http://dx.doi.org/10.1117/12.359333.

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Zdanowski, M. « Static electrification properties of hexane and cyclohexane mixtures ». Dans 2008 IEEE International Conference on Dielectric Liquids (ICDL 2008). IEEE, 2008. http://dx.doi.org/10.1109/icdl.2008.4622521.

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Hestad, O. L., T. Grav, L. E. Lundgaard, S. Ingebrigtsen, M. Unge et O. Hjortstam. « Numerical simulation of positive streamer propagation in cyclohexane ». Dans 2014 IEEE 18th International Conference on Dielectric Liquids (ICDL). IEEE, 2014. http://dx.doi.org/10.1109/icdl.2014.6893124.

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Abbasi, Mehdi, Nadja Slavinskaya et Uwe Riedel. « Kinetic Modeling of Cyclohexane Oxidation Including PAH Formation ». Dans 55th AIAA Aerospace Sciences Meeting. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-0838.

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Rapports d'organisations sur le sujet "Cyclohexane"

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Malinauskas, R. A., et C. H. Byers. Droplet formation phenomena in dc electric fields. [Pendant drops of 2 systems, water-air and water-cyclohexane]. Office of Scientific and Technical Information (OSTI), juillet 1985. http://dx.doi.org/10.2172/5623941.

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Osterheld, T. H., M. D. Allendorf et R. Larson. Gas-phase chemistry during the conversion of cyclohexane to carbon : Flow reactor studies at low and intermediate pressure. Office of Scientific and Technical Information (OSTI), juillet 1995. http://dx.doi.org/10.2172/83841.

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Pesce-Rodriguez, Rose A., et Stephanie M. Piraino. Characterization of Cyclohexanone Inclusions in Class 1 RDX. Fort Belvoir, VA : Defense Technical Information Center, juin 2014. http://dx.doi.org/10.21236/ada602780.

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NIOSH skin notation profile : cyclohexanol. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, octobre 2020. http://dx.doi.org/10.26616/nioshpub2021101.

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NIOSH skin notation profile : cyclohexanone. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, octobre 2020. http://dx.doi.org/10.26616/nioshpub2021103.

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