A highly regioselective C-C bond cleavage of the cyclopropane rings occurs in substituted allenylcyclopropanes in the presence of cationic rhodium(I) complexes. Thus, ring expansion of readily accessible allenylcyclopropanes can be achieved to give 3-methylenecyclopentenes, which could have applications as multifunctional synthetic building blocks.
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Hayashi et al. (1998) studied this question.