Exclusive opening off the three-membered ring between C-2 and C-3 occurs in the reaction of methylenecyclopropane (1) with olefins catalyzed by palladium(O) compounds. Up to 300 mol of (1) are converted per mol of Pd; cyclodimerization of (1) to (2) occurs as competing reaction.
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Binger et al. (1977) studied this question.
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