Abstract
Naphtho[1,8-de][1,3]dithiin-1-bis(ethoxycarbonyl)mcthylides (3) were prepared by the reaction of naphtho[1,8-de]dithiins with dicthyl diazomalonate in the presence of copper acetylacetonate. The sulfonium ylides 3 underwent photo-rearrangement giving olefins 5 quantitatively together with naphthalene-1,8-dithiole.
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