Catalyzed by Lewis acid, 1,2-diphenyldiselane or 1,2-di-p-tolyldisulfane could add to methylenecyclopropanes smoothly. Compared with the reported free radical additions, the results were quite different. A four-membered carbon ring was constructed to give cyclobutane-1,1-diylbis(phenylselane) derivatives or cyclobutane-1,1-diylbis(p-tolylsulfane) derivatives as products, which are useful intermediates in organic synthesis.
Cyclobutane derivatives Q 0022Lewis Acid Catalyzed Reaction of Methylenecyclopropanes with 1,2-Diphenyldiselane or 1,2-Di-p-tolyldisulfane. -A new and convenient access to cyclobutanediselanes of type (III) and cyclobutanedisulfanes like (V), useful synthons, is presented.-(YU*, L.; MENG, J.; XIA, L.; GUO, R.; J.
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