Low-Temperature Ozonolysis of 2-Alkenyl-1,1-dichlorocyclopropanes
摘要:
Low-temperature ozonolysis of 2-alkenyl-1,1-dichlorocyclopropanes under different conditions (O-3/MeOH-CH2Cl2-NaOH, O-3/MeOH or O-3/CH2Cl2-AcOH with subsequent treatment with semicarbazide hydrochloride) afforded the corresponding carbonyl and carboxy derivatives at different ratios, depending on the substrate structure and workup procedure. Peroxide products of ozonolysis of 1,1-dichloro-2-ethenylcyclopropane [3-(2,2-dichlorocyclopropyl)-1,2,4-trioxolane and (2,2-dichlorocyclopropyl)(methoxy)methyl hydroperoxide] turned out to be more stable than those derived from 1,1-dichloro-2-ethenyl-2-methylcyclopropane and were isolated in the pure state.
Dichlorocarbenation of conjugated diene hydrocarbons
作者:G. Z. Raskil’dina、Yu. G. Borisova、V. M. Yanybin、S. S. Zlotskii
DOI:10.1134/s0965544117020219
日期:2017.3
Partial and complete dichlorocarbenation of conjugateddiene hydrocarbons in the presence of the phase-transfer catalyst catamine AB has been studied. It has been shown that at the initial stages of the process (conversion of the reactant olefins below 30%), alkenyl-gem-dichlorocyclopropanes are the main products. In the case of complete carbenation, corresponding bicyclic structures are formed. The
Catalytic Isomerization of Substituted Vinylcyclopropanes
作者:G. Z. Raskil’dina、Yu. G. Borisova、A. R. Davletshin、S. S. Zlotskii
DOI:10.1134/s0012500819070115
日期:2019.7
The catalytic isomerization of substituted vinyl-gem-dichlorocyclopropanes in the presence of a series of zeolite catalysts has been studied. It has been shown that substituted gem-dichlorocyclopentenes are the sole reaction products. The influence of a number of factors (the type of catalyst, temperature, and reaction time) on the yield of isomerization products has been investigated.