Showing papers on "Cyclohexanone published in 1988"
TL;DR: In this paper, a new family of long-lived catalysts based upon the (bis(2-pyridyl-imino)isoindolinato) ligand was discovered.
72 citations
66 citations
TL;DR: A pathway for anaerobic cyclohexanol degradation involving these intermediates is proposed using three strains of denitrifying bacteria enriched and isolated from oxic or anoxic habitats.
Abstract: Three strains of denitrifying bacteria were anaerobically enriched and isolated from oxic or anoxic habitats with cyclohexanol or cyclohexanone as sole electron donor and carbon source and with nitrate as electron acceptor. The bacteria were facultatively anaerobic, Gramnegative and metabolism was strictly oxidative with molecular oxygen, nitrate, or nitrite as terminal electron acceptor. Cyclohexanol and cyclohexanone were degraded both anaerobically and aerobically. Aromatic compounds were oxidized in the presence of molecular oxygen only. One of the bacterial strains was further characterized. During anaerobic cyclohexanol degradation approximately 40% of the substrate was oxidized to phenol, which accumulated as dead-endproduct in the growth medium; 60% of cyclohexanol was completely oxidized to CO2 and assimilated, respectively. In addition to phenol formation, transient accumulation of cyclohexanone, 2-cyclohexenone and 1,3-cyclohexanedione was observed. Based on these findings we propose a pathway for anaerobic cyclohexanol degradation involving these intermediates.
50 citations
45 citations
TL;DR: In this paper, the GifIV system (iron catalyst, oxygen, zinc, carboxylic acid) and its electrochemical equivalent (Gif-Orsay system) were used to oxidize saturated hydrocarbons (cyclohexane, 3-ethylpentane, methylcyclopentane, cis - and trans -decalin and adamantane) and showed that tertiary alcohols result from a mechanism essentially radical in nature.
41 citations
TL;DR: In this paper, a commercial CuO ZnO catalyst was used for cyclohexanol de-hydrogenation in a fixed-bed micro-reactor, and the results showed that the catalyst maintained constant activity at low oxygen: cyclhexanol mol ratios and its stability was dependent on the reaction temperature.
36 citations
35 citations
TL;DR: In this article, the authors investigated the rate of cyclohexane oxidation in the presence and absence of the micelle cetyltrimethylammonium bromide (CTAB) in a 1:1 water-dioxane mixture.
32 citations
29 citations
28 citations
TL;DR: L'oxydation donne des diacides carboxyliques (acide adipique, acide glutarique and acide succinique) avec un rendement dependant des conditions de reaction as discussed by the authors.
Abstract: L'oxydation donne des diacides carboxyliques (acide adipique, acide glutarique, acide succinique) avec un rendement dependant des conditions de reaction
TL;DR: In this paper, the authors investigated the thermodynamics of Ru(III)-EDTA catalyzed oxidation of cyclohexane to cycloenanol and of cyclhexanol to cyclhexanone by molecular oxygen in an acidic medium.
TL;DR: Aldol condensation of cyclohexanone lithium enolate with benzaldehyde has been shown to give a considerably higher stereoselectivity at low temperature than that reported previously as mentioned in this paper.
Abstract: Aldol condensation of cyclohexanone lithium enolate with benzaldehyde has been shown to give a considerably higher stereoselectivity at low temperature than that reported previously.
TL;DR: In this paper, the Grignard reagents were added to 3-substituted 5-trimethylsilyl-2-cyclohexenones in a highly diastereoselective manner.
TL;DR: Chlorination using trimethylchlorosilane and dimethylsulfoxide with bromide ion catalysis has been shown to yield almost quantitative yields for 1,3-diphenylacetone, benzoylacetone and propiophenone.
TL;DR: 5 patients with allergic contact dermatitis caused by various paints were demonstrated to be sensitive to a cyclohexanone resin (C‐R) present in the paints.
Abstract: 5 patients with allergic contact dermatitis caused by various paints were demonstrated to be sensitive to a cyclohexanone resin (C-R) present in the paints. Sensitization studies in guinea pigs with C-R and cyclohexanone showed one batch of C-R to be a sensitizer.
Patent•
27 Dec 1988
TL;DR: In this article, a method for producing cyclohexanone from cycloshexanol using oxidative dehydrogenation was proposed, which comprises adding a certain amount of a gaseous oxidant to the cyclo-hexanol feed stream; and, converting the cycloshenanol to cycloencoder over a CuO-ZnO catalyst.
Abstract: This invention provides a method for producing cyclohexanone from cyclohexanol using oxidative dehydrogenation. More particularly, this invention comprises adding a certain amount of a gaseous oxidant to the cyclohexanol feed stream; and, converting the cyclohexanol to cyclohexanone over a CuO-ZnO catalyst.
TL;DR: In this paper, a Ferrier rearrangement was used to obtain the cyclohexanone from D-glucose and a convenient synthesis of crystalline pseudo-α-Dglucopyranose (15), its congeners (16), as well as their partially protected derivatives has been carried out.
Abstract: Starting from D-glucose and using the Ferrier rearrangement to obtain the cyclohexanone (1), a convenient synthesis of crystalline pseudo-α-D-glucopyranose (15), its congeners (16) and (17), as well as their partially protected derivatives has been carried out.
TL;DR: In this article, a flow system was used to study gas-phase equilibria of cyclohexanol dehydrogenation: in the temperature range from 467.5 to 533.8 K over a catalyst consisting of copper and zinc oxides, and of hydrogen redistribution during in a temperature range 453.1 to 633.1 K over magnesium oxide catalyst.
TL;DR: Catalyse par l'acetate de cobalt(II) and le bromure de potassium as discussed by the authors, a modele cinetique is presente, but it is not available in this mode.
Abstract: Catalyse par l'acetate de cobalt(II) et le bromure de potassium. Un modele cinetique est presente
TL;DR: In this paper, a new synthesis of 1,2-glycol monoethers has been achieved byutilizing decarbonylation of α-alkoxyacid chlorides mediated by samarium diiodide in the presence of ketones.
Patent•
15 Aug 1988
TL;DR: In this paper, the Disclosure Diphenylamines or N,N'-diphenyl-phenylenedi-amines can be obtained by heat-reacting an aniline or a phenylenediamine with preferably an excess of a phenol in an amount of 4 to 20 moles per mole of the anilines or phenylensiamine in the presence of a hydrogen transfer catalyst and a cyclohexanone corresponding to said phenol.
Abstract: of the Disclosure Diphenylamines or N,N'-diphenyl-phenylenedi-amines can be obtained by heat-reacting an aniline or a phenylenediamine with preferably an excess of a phenol in an amount of 4 to 20 moles per mole of the aniline or phenylenediamine in the presence of a hydrogen transfer catalyst and a cyclohexanone corresponding to said phenol. The excess phenol used in the reaction undergoes reduction in the reaction system to form a cyclohexanone, which in turn reacts with the aniline or phenylenediamine to form a Schiff base and is thus consumed. The Schiff base forms the intended product by means of a dehydrogen-ation reaction, and the hydrogen evolved at this time reduces the phenol to form a cyclohexanone. The phenol present in excess thus becomes in the system a solvent, a starting material for the cyclo-hexanone, and an acceptor of the hydrogen that forms as a by-product at the time of formation of the intended product. Hence, it becomes possible to obtain the intended product at a high selectivity from the anilines and phenylenediamines. The process of this invention is an advan-tageous process for the industrial production of espe-cially the nuclearly substituted diphenylamines.
TL;DR: In this article, the dependence of the rate of carboxylation upon the concentration of the reactant was investigated in dimethyl sulfoxide, and it was suggested that caroxylation proceeds via a reaction between CO2 dissolved in dimethyldiazabicyclo[5.4.0]undec-7-ene(DBU) and the anion of cyclohexanone, rather than between the CO2 adduct with DBU and cycloxide.
Abstract: The dependence of the rate of carboxylation upon the concentration of the reactant was investigated in dimethyl sulfoxide. The reaction rate depended upon the concentration of cyclohexanone and 1,8-diazabicyclo[5.4.0]undec-7-ene(DBU) in the first order, respectively. The reaction also followed first-order kinetics regarding the CO2 pressure in the range 50–400 Torr. From these reaction characteristics, it is suggested that carboxylation proceeds via a reaction between CO2 dissolved in dimethyl sulfoxide and the anion of cyclohexanone, rather than between the CO2 adduct with DBU and cyclohexanone. The results of carboxylation by the CO2 adduct with DBU and by CO2 dissolved in dimethyl sulfoxide also support the above conclusion. The formation of the cyclohexanone anion by a reaction of cyclohexanone with DBU was verified by the UV spectrum of a solution of concentrated DBU and cyclohexanone.
TL;DR: In this paper, les melanges de: heptane, cyclohexane, CCl 4 ou benzene avec cyclopentanone ou cyclochexanone are presented.
Abstract: Donnees pour les melanges de: heptane, cyclohexane, CCl 4 ou benzene avec cyclopentanone ou cyclohexanone
Patent•
11 Apr 1988TL;DR: In this article, the starting pigments have been coated with 0.2-20% by weight of a saturated monocarboxylic acid having 10°-25° C. atoms or of a cyclohexanone condensate resin.
Abstract: The invention relates to lamina-shaped pearlescent pigment preparations of improved flowability, wherein the starting pigments have been coated with preferably 0.2-20% by weight of a saturated monocarboxylic acid having 10°-25° C. atoms or of a cyclohexanone condensate resin.
Journal Article•
TL;DR: The promoting effect of cyclohexanone derivatives on the percutaneous absorption of ketoprofen and indomethacin from gel ointments was investigated in rats and it was found that a chain length of eight carbons is an important factor for absorption enhancement in this series.
Abstract: The promoting effect of cyclohexanone derivatives on the percutaneous absorption of ketoprofen and indomethacin from gel ointments was investigated in rats. Drug absorption was markedly enhanced by the addition of 2-tert-butylcyclohexanone. Promoting activities of 2,6-dimethyl and 4-tert-butylcyclohexanone were also observed, but their effects were significantly lower than that of the 2-tert-butyl derivative. The effect of side chain length at the 2-position of the cyclohexanone ring on the percutaneous absorption of these drugs was determined similarly using a series of 2-n-alkylcyclohexanones. Pronounced effects were observed in the case of 2-n-octylcyclohexanone, suggesting that a chain length of eight carbons is an important factor for absorption enhancement in this series. The extent of absorption enhancement was found to be an almost linear function of 2-n-octycyclohexanone concentrations in the range from 0 to 10%.
TL;DR: In this paper, a 1,2-Diorganometallic species generated utilizing the TiCl 4 /Mg/BrCH 2 CH 2 Br reagent system reacts with ketones to give the corresponding 1, 4-diols and/or 1, 2-Diols in moderate yields.