Abstract

The cis-dilithioalkene 2 a is stable in solution at −30 °C; it is formed as intermediate during the reductive cleavage of a cyclopropane bond in 1 a leading to 3 a. In contrast, in the analogous reaction of 1 b, only the product 3b of ring-opening can be detected, and no intermediate. R = Ph(a), cyclopropyl (b).

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