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■ The Reaction of Unsaturated Carbonyl Compounds with "Activated" Sulfur (II). Formation of Cyclic Disulfide and Polysulfides

Ugo Chiacchio, Antonino Corsaro, Venerando Pistarà, Giovanni Purrello,* and Antonio Rescifina

*Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, I-95125 Catania, Italy

Abstract

From the reaction of cinnamylideneacetophenone (1), sulfur and triethylamine in suitable solvents at room temperature, phenyl{3-[(E)-1-((5-benzoyl-3H-1,2-dithiol-3-ylidene)phenylmethyldisulfanyl)-1-phenylmethylidene]-3H-1,2-dithiol-5-yl}methanone (7) was isolated together with two polysulfurated compounds to which structures of phenyl(7-phenyl-1,2,3-trithiepin-4-yl)methanone (12) and phenyl(8-phenyl-1,2,3,4-tetrathiocin-5-yl)methanone (13) were assigned. The obtaining of these new products allows to complete the sequence of the whole process.