Reaction of phosphonium ylides with excess sulfur afforded the corresponding thiosulfines, which were trapped with maleic anhydride to give the corresponding cycloadducts (1,2-dithiolanes) in good yields. Intermediary thiosulfines were also formed by sulfurization of thiobenzophenones with elemental sulfur to give the 1,2-dithiolanes in moderate yields.
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Okuma et al. (1993) studied this question.
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