Reactivity of phenyliodonium bis(aryl- or alkyl-sulphonyl)methylides towards thiobenzophenones

Abstract

Thermal reactions of several phenyliodonium bis(aryl- or alkyl-sulphonyl)methylides with some thiobenzophenones are described. 4,4′-Dimethoxythiobenzophenone affords exclusively 2-arylsulphonyl-3-(4-methoxyphenyl)-6-methoxybenzo[b]thiophenes, whereas other thiobenzophenones may give also gem-bis(arylsulphonyl)thiiranes and in one case an unsaturated gem-disulphone. Some oxidation reactions of an ylide with various substrates occur either thermally or photochemically.