1,2-Dithiole-3-thiones and 1,2,4-dithiazole-3-thiones react with dibenzoylacetylene to provide thioacylmethylene or thioacylimino-1,3-dithiole adducts respectively. Some of these, on sulfurization, provide thieno[3,4d]-1,3-dithiole derivatives, but in others a retro-1,3-dipolar reaction predominates. Further reaction of the initial adducts with more dibenzoylacetylene provides spiran compounds.
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Ahmed et al. (1970) studied this question.
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