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Cyclobutane derivativesQ 0022 Reactions of Monoaryl-Substituted Methylenecyclobutanes and Methylenecyclo-

propanes with 1-Hydroxybenzotriazole (HOBt), 1-Hydroxy-7-azabenzotriazole (HOAt), and 1-Hydroxysuccinimide (HOSu). — Treatment of the title compounds with HOBt results in formation of cyclobutane and cyclopropane ketones like (III) and (VII). Methylenecyclobutanes containing neutral and electron-rich aryl substituents re-act also with HOAt, but with HOSu complicated product mixtures are obtained. Di-arylated methylenecyclopropanes do not react with HOAt and HOSu. With HOBt ring opening products like (IX) are isolated. Alkyl-aryl- substituted analogues provide al-cohols of type (XI). — (JIANG, M.; SHI*, M.; J. Org. Chem. 74 (2009) 6, 2516-2520; State Key Lab. Organomet. Chem., Shanghai Inst. Org. Chem., Chin. Acad. Sci., Shanghai 200032, Peop. Rep. China; Eng.) — Jannicke

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