Abstract

The mechanism of the formation of 4-benzylidene-1, 3-dithiolane-2-thione (19) in the reaction of 4-benzylidene-1, 3-oxathiolane-2-thione (14) with sodium ethyl xanthate (15) became clear by the measurement of the radioactivity of 35S-4-benzylidene-1, 3-dithiolane-2-thione (32), which was synthesized by the treatment of 14 with 35S-sodium ethyl xanthate (29), and that of 35S-4-benzylidene-1, 3-dithiolane-2-one (38) which was obtained by the oxidation of 32 with mercuric acetate.

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