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Cyclobutane derivativesQ 0022 Lewis Acid Catalyzed Reaction of Methylenecyclopropanes with 1,2-Diphenyldi-

selane or 1,2-Di-p-tolyldisulfane. — A new and convenient access to cyclobutanedi-selanes of type (III) and cyclobutanedisulfanes like (V), useful synthons, is presented. — (YU*, L.; MENG, J.; XIA, L.; GUO, R.; J. Org. Chem. 74 (2009) 14, 5087-5089; Coll. Chem. Chem. Eng., Yangzhou Univ., Yangzhou, Jiangsu 225002, Peop. Rep. China; Eng.) — Jannicke

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