Showing papers on "Cyclohexene published in 1972"
71 citations
TL;DR: Perfluoroheptylcopper with 1-heptene and 1-dodecene gives mixtures of 1-(perfluorohexene)cycloalkane whereas cyclopentene yields only the olefin this paper.
35 citations
33 citations
TL;DR: In this paper, the rate of carbon formation during the catalytic decomposition of benzene vapor over nickel plates at temperatures from 600 to 970°C was investigated at temperatures varying from 0 to 600°C.
30 citations
TL;DR: In this article, the authors described the kinetics of homogeneous cyciohexene hydrogenation catalyzed by CoH(CO) 2 [P(n-C 4 H 9 ) 3 ] under 30 atm of hydrogen and at 60°.
26 citations
TL;DR: In this paper, the thermal decomposition of 3-chloro-3-aryldiazirines in various solvents has been investigated over the temperature range 60-100 "C".
Abstract: The thermal decomposition of 3-chloro-3-aryldiazirines in various solvents has been investigated over the temperature range 60-100 "C. The intermediate carbenes have been isolated as norcaranes by the use of cyclohexene. Substituent effects on rates of reaction are small and a Hammett correlation was unsuccessful with either u or u+ constants. Possible mechanisms for the decompositions are discussed. La dt.composition thermique des chloro-3 aryl-3 diazirines dans divers solvants, a ete examinee dans un domaine de temperature de 60 a 100 "C. Les carbenes intermediaires ont ete isolts sous forme de norcaranes en presence de cyclohexene. Les effets des substituants sur les vitesses de reaction sont faibles et une correlation de Hammett est appliqute sans succes que ce soit avec les constantes u ou a+. Les mCcanismes possibles pour ces decompositions sont discutks. [Traduit par le journal]
23 citations
22 citations
TL;DR: The dependence of the initial rate on the catalyst amount has been studied both for the oxidation and the decomposition reactions in liquid phase using manganese dioxide as a catalyst.
22 citations
TL;DR: In this article, the authors show that the activity of characterized PdAu alloy films for deuteration of benzene and hydrogenation of p -xylene falls to zero at median alloy compositions.
18 citations
TL;DR: The first compound gave 7,8-tetramethylene-1,4-,6,9-tetrathia-spiro [4.4] nonane by irradiation with low pressure mercury lamp as mentioned in this paper.
Abstract: Photochemical reactions of 5-phenyl- and 4-,5-diphenyl-3H-1,2-dithiole-3-thiones with olefins gave 2-thiobenzoylmethylene-1,3-dithiolanes. Ethylenetrithiocarbonate, 2H-1,3-dithiole-2-thione or 3H-1,2-dithiole-3-one did not react with cyclohexene under the same condition, but the first compound gave 7,8-tetramethylene-1,4-,6,9-tetrathia-spiro [4.4] nonane by irradiation with low-pressure mercury lamp.
18 citations
TL;DR: The determination based on the formation of cyclohexene under moderate nitrosating conditions proved to be the most precise and sensitive.
Abstract: Gas-liquid chromatographic determinations of cyclohexene and of cyclohexyl nitrite, formed by reaction of cyclamate with nitrous acid under moderate or strong nitrosating conditions, have been evaluated. The determination based on the formation of cyclohexene under moderate nitrosating conditions proved to be the most precise and sensitive. The application of this procedure to the determination of cyclamate in soft drinks (ten orange and ten lemon drinks) gave recoveries of 98 to 101 per cent. at the 1 mg ml–1 level; reaction conditions were evaluated and compared with those used by previous workers.
TL;DR: Bromination of 3-cyclohexene-1-carboxylic acid (1) gives mixtures of the trans-dibromo-derivatives 3 and 4 and cis -3-hydroxy- trans-bromocyclohexane-1 -carboxyl acid lactone as mentioned in this paper.
TL;DR: In this paper, 2,5-Dioxo-1,2,5,6,7,8hexahydroquinoline 2 is formed upon condensation of methyl propiolate with ketone 1 in DMF as solvent.
Abstract: 2,5-Dioxo-1,2,5,6,7,8-hexahydroquinoline 2 is formed upon condensation of methyl propiolate with ketone 1 in DMF as solvent. On the other hand, reaction 1 with propargylic acid led to 1,8-dioxo-perhydroacridine 4b as the sole isolable product.
TL;DR: The pyridone-to-pyridazine rearrangement was observed to a much smaller extent with di- and tri-phenyl-1-amino-2,3-diphenylquinolin-4-one or 5-aminophenanthridin-6-one.
Abstract: Oxidation of 1-amino-3,4,5,6-tetraphenyl-2-pyridone with lead tetra-acetate results in loss of carbon monoxide and retention of nitrogen to give 3,4,5,6-tetraphenylpyridazine. This rearrangement is thought to involve ring expansion of the N-nitrene to a diazepinone and valence tautomerism of this to give a bicyclic intermediate which extrudes carbon monoxide. This reaction can be suppressed by competitive intermolecular reaction of the nitrene with sulphoxides or with cyclohexene. This pyridone-to-pyridazine rearrangement is observed to a much smaller extent with di- and tri-phenyl-1-amino-2-pyridones, and not at all with 1-amino-2,3-diphenylquinolin-4-one or 5-aminophenanthridin-6-one.
TL;DR: In this article, the authors considered the possible interconversion paths of the cyclohexene molecule from the point of view of a molecular mechanical model and applied the modified valley method to the search of the potential function's saddle points arrived at the boat transition state.
TL;DR: In this paper, a homogeneous system for hydrogen transfer from a number of organic compounds to olefins was studied, and it was shown that dihydroxybenzenes, such as pyrocatechol and hydroquinone, were superior to prim-and sec-alcohols, 1-dodecanethiol, and cyclohexene as hydrogen donors.
Abstract: Hydrogen transfer from a number of organic compounds to olefins in a homogeneous system was studied. In the case of hydrogen transfer to 1,5-cyclooctadiene, using dichlorobis(triphenylphosphine)iron(II) as the catalyst, dihydroxybenzenes, such as pyrocatechol and hydroquinone, were much superior to prim- and sec-alcohols, 1-dodecanethiol, and cyclohexene as hydrogen donors.
TL;DR: In this paper, the ESR spectrum was observed at g=2.003 under electrolysis at the second wave, indicating that the cyclohexadienes reaction is catalytic.
Abstract: The metal complexes of α,β,γ,δ-tetraphenylporphine (M(TPP), M=Co(II), Ni(II), FeCl(III), Pd(II), Pt(II), Cu(II), MnCl(III), and V(IV)O) were electrolyzed at −2.0 V vs. Ag wire in the presence of cyclohexene under nitrogen atmosphere. The cobalt complex only had the catalytic activity of dehydrogenating cyclohexene to 1,3- and 1,4-cyclohexadiene and benzene. With the use of dimethylformamide, dioxane, and hexamethylphosphoric triamide as solvent, cyclohexadienes were produced, and with that of benzonitrile, and dimethyl sulfoxide, benzene was produced and cyclohexadienes were scarcely produced at all. In all cases, the current efficiency of the products was much higher than 100%, indicating that the dehydrogenation reaction is catalytic. The composition of the products also varied with the reaction temperature. When ethanol was added to the reaction solution, the amount of cyclohexadienes increased with benzonitrile used as solvent. The ESR spectrum observed at g=2.003 under electrolysis at the second wave...
TL;DR: In this paper, a β-bromo-formyloxylation of olefins with N, N-dibromobenzenesulfonamide and formic acid was developed.
Abstract: A convenient method for β-bromo-formyloxylation of olefins with N, N-dibromobenzenesulfonamide and formic acid was developed. Cyclohexene, styrene, trans-β-methyl-styrene, and 1-hexene were made to react to give trans-2-brmocyclohexyl formate (I), 2-bormo-1-phenylethyl formate (II), erythro-2-bromo-1-phenylpropyl formate (III), and 1-bromo-2-hexyl fromate (IV).
TL;DR: In this paper, the structures of cycloadducts from benzonitrile oxide and cyclohexene systems have been established by spectral analysis and chemical evidence, and they were shown to be 1,3-dipolar cycloadditions.
Abstract: The oxime-like CN bond of 2-isoxazolines undergoes 1,3-dipolar cycloaddition with benzonitrile oxide leading to new heterocyclic systems. The structures of the cycloadducts from benzonitrile oxide and cyclohexene systems have been established by spectral analysis and chemical evidence.
TL;DR: In this paper, a hexafluoroacetone azine reacts with but-2-ene or cyclohexene under thermal conditions to give products formally derived from the intermediacy of bis(trifluoromethyl)carbene.
Abstract: Hexafluoroacetone azine reacts with but-2-ene or cyclohexene under thermal conditions to give products formally derived from the intermediacy of bis(trifluoromethyl)carbene. Thus cis- or trans-but-2-ene afford a mixture of cis- and trans-2,3-dimethyl-1,1-bis(trifluoromethyl)cyclopropane in the ratio ca. 1 : 4 and cyclohexene gives 7,7-bis(trifluoromethyl)norcarane and the allylic insertion compound, 3-(2,2,2-trifluoro-1-trifluoromethylethyl)-cyclohexene, in the ratio ca. 2 : 5. Pyrolysis of the trans-cyclopropane gives 1,1,1-trifluoro-2-methyl-2-trifluoro-methylpent-2-ene and 1,1-bis(trifluoromethyl)propa-1,2-diene among the products.
TL;DR: In this article, the Fischer indole synthesis with 3-substituted cyclanones leads to only one of two formally possible isomers, and a discussion of the regioselectivity is based on results from Extended Huckel calculations on cyclohexene derivatives and on a comparison with various experimental factors.
TL;DR: In this article, a triethyl phosphite deoxygenation of pentafluoronitrosobenzene in the presence of 2,3-dimethyl-but-2-ene cis-and trans-but 2-ene, trans-stilbene, and cyclohexene gives the aziridines expected from stereospecific addition of a singlet aryl nitrene to the olefin.
Abstract: Triethyl phosphite deoxygenation of pentafluoronitrosobenzene in the presence of 2,3-dimethyl-but-2-ene cis- and trans-but-2-ene, trans-stilbene, and cyclohexene gives the aziridines expected from stereospecific addition of a singlet aryl nitrene to the olefin.
TL;DR: In this article, the cobalt complex of α,β,γ,δ-tetraphenylporphine reduced by electrolysis had the catalytic activity of dehydrogenating cyclohexene to 1,5- and 1,4-cyclohexadiene and benzene.
Abstract: The cobalt complex of α,β,γ,δ-tetraphenylporphine reduced by electrolysis had the catalytic activity of dehydrogenating cyclohexene to 1,5- and 1,4-cyclohexadiene and benzene. The composition of the dehydrogenated products depended upon the solvents used. An anion radical of Co(I) complex was assumed the intermediate based on e.s.r. and polarographic data.
TL;DR: In this article, the pyrolysis of cyclohexa-1,3-diene (C6H8) has been studied between 512·3 and 672·5 K at pressures between 10 and 500 Torr.
Abstract: The pyrolysis of cyclohexa-1,3-diene (C6H8) has been studied between 512·3 and 672·5 K at pressures between 10 and 500 Torr. The products are benzene (B), cyclohexene (C), a compound with formula C12H18(E), hydrogen, and traces of C2 compounds. The formations of benzene, cyclohexene, and C12H18 are all of the second order and their rates are unaffected by the surface-to-volume ratio of the reaction vessel or by the presence of added propene. The rate constants (in l mol–1 s–1) are given by equations (i)–(iii). The rate of formation of H2 is ca. 1/7 that of B. log10kB=–(35,500 ± 100)/4·576T+(10·13 ± 0·04)(i), log10kC=–(36,400 ± 1100)/4·576T+(10·25 ± 0·40)(ii), log10kE=–(35,600 ± 1800)/4·576T+(9·52 ± 0·67)(iii)The results are explained by a non-chain, radical mechanism where the initiation step is the bimolecular disproportionation (iv) to cyclohex-2-enyl and cyclohexadienyl radicals. The estimated value of the rate constant ka is [graphic omitted] (iv), log10ka=–(35,500 ± 1000)/4·576T+(10·04 ± 0·40) l mol–1 s–1.
TL;DR: In this article, 1-bromo-6-(2-hydroxyethoxy)-1,4-cyclohexadiene (13) is also converted to 7 and elimination products, benzene and ethylene glycol.