The thermolysis of α-pinene and verbenone epoxides in supercritical solvents
摘要:
Thermal transformations of alpha-pinene and verbenone epoxides were studied in supercritical solvents with complex compositions, including CO2, lower alcohols (ethanol and isopropanol), and water, over the temperature and pressure ranges 387-575 K and 135-215 atm. The main product from alpha-pinene epoxide in a supercritical solvent containing water was campholenic aldehyde and pinocamphone; the total content of these products in the reaction mixture was 80%. Suggestions concerning the mechanism of the thermal isomerization of alpha-pinene epoxide depending on the acidity of supercritical solvents were made. The direction of verbenone epoxide transformations was independent of the presence of water in the mixture. The main identified products were ketoalcohols with para-menthane and camphane frameworks.
The thermolysis of α-pinene and verbenone epoxides in supercritical solvents
摘要:
Thermal transformations of alpha-pinene and verbenone epoxides were studied in supercritical solvents with complex compositions, including CO2, lower alcohols (ethanol and isopropanol), and water, over the temperature and pressure ranges 387-575 K and 135-215 atm. The main product from alpha-pinene epoxide in a supercritical solvent containing water was campholenic aldehyde and pinocamphone; the total content of these products in the reaction mixture was 80%. Suggestions concerning the mechanism of the thermal isomerization of alpha-pinene epoxide depending on the acidity of supercritical solvents were made. The direction of verbenone epoxide transformations was independent of the presence of water in the mixture. The main identified products were ketoalcohols with para-menthane and camphane frameworks.
The present invention relates to the use of 3-methyl-6-(1-methylethenyl)cyclohex-3-ene-1,2-diol, its isomers and derivatives, as a compound for Parkinson disease treatment, that can be used in medicine. The compound is highly active, low toxic and can be synthesized from available natural compound α-pinene.
Polymer anchored oxovanadium catalyst was synthesized and characterized. The solid catalyst was characterized by Fourier transform infrared spectroscopy (FT-IR), UV-vis diffuse reflectance spectroscopy (DRS), thermogravimetric analysis (TGA) and scanning electron microscope (SEM). Its catalytic activity was evaluated for the oxidation of various alkenes, sulfides and aromatic alcohols with 30% H2O2 under mild reaction conditions. This catalyst was also effective for the oxidative bromination reaction of organic substrates with 80-100% selectivity of mono substituted products with H2O2/KBr at room temperature. The above reactions require minimum amount of H2O2, short time period and most importantly all the above reactions occur in aqueous medium. The developed catalyst can be facilely recovered and reused six times without significant decrease in activity and selectivity. This result confirms that the polymer anchored complex was not leached during the reaction, suggesting the true heterogeneous nature of the catalyst. (C) 2012 Elsevier B.V. All rights reserved.
Fokin, A. A.; Butova, E. D.; Gulevich, A. V., Russian Journal of Organic Chemistry, 1993, vol. 29, # 5.2, p. 891 - 892
作者:Fokin, A. A.、Butova, E. D.、Gulevich, A. V.、Yurchenko, A. G.、Krasutskii, P. A.