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■ Alkatrienyl Sulfoxides and Sulfones. Part. VI. Cheletropic Addition of Sulfur Dioxide to 1- and 3-Vinylallenyl Sulfoxides and Sulfones

Valerij Ch. Christov* and Ivaylo K. Ivanov

*Department of Chemistry, University of Shumen, BG-9700 Shumen, Bulgaria

Abstract

The reaction of 1- and 3-vinylallenyl sulfoxides and sulfones with sulfur dioxide in 1,2-dichloroethane at reflux proceeds as a cheletropic addition leading to the formation of 2-isopropylidene-3-sulfinyl(sulfonyl)- or 2-sulfinyl- (sulfonyl)methylidene-substituted 2,5-dihydrothiophene 1,1-dioxides in very good yields.