Synthesis of 3-imino and 3-ylideno derivatives of 4-fluoro-5-polyfluoroalkyl-1,2-dithiolenes
摘要:
Reactions of 4-fluoro-5-polyfluoroalkyl-1,2-dithiol-3-thiones with hydroxylamine and hydrazines occur with replacement of the thiocarbonyl by imino group affording oximes and hydrazones respectively. N-Alkyl- and N-aryl-3-imino-1,2-dithiolenes formed in reactions of 3-chlorothio-1,2-dithiolium salts with primary alkyl- or arylamines. 3-Chlorothio-1,2-dithiolium salts react with compounds possessing an active methylene group yielding 3-ylideno derivatives of 1,2-dithiolenes.
Successive Cycloadditions between 4-Fluoro-5-trifluoromethyl-1,2-dithiole-3-thione and Dimethyl Acetylenedicarboxylate: New Fluorinated Thiaheterocycles through New Reaction Mechanisms
作者:Vadim M. Timoshenko、Jean-Philippe Bouillon、Alexander N. Chernega、Yuriy G. Shermolovich、Charles Portella
DOI:10.1002/ejoc.200300036
日期:2003.7
The cycloaddition reaction between dimethyl 2-(1-fluoro-2-trifluoromethyl-2-thioxoethylidene)-1,3-dithiole-4,5-dicarboxylate and dimethylacetylenedicarboxylate proceeds efficiently under irradiation conditions in air. A study of the reaction conditions resulted in the proposal of a chain mechanism initiated by a photochemically induced single-electron transfer to oxygen. On the other hand, the cycloadduct