Abstract
Allenyl organometallic reagents of type R 2C C CH(CH 2) nCH 2M undergo cyclization at the central allenic carbon for n = 2 (M = Li) and at the near allenic carbon for n = 3 (M = CuCNLi) to provide cyclopentane systems; little cyclization, was observed for the n = 4 systems (M = Li, CuCNLi).
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