Abstract
Reactions were carried out on thioketones with vinylcarbenoids. Rh 2(OAc) 4-catalyzed reaction of vinyldiazo compounds 1a,b with xanthione 2 and thiochromone 3 gave thiiranes 4b and olefins 5 and 6, desulfurization products from thiiranes, while the reaction of 1c with 2 and 3 afforded dihydrothiophenes 7, 8 and 9.
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