Add time:08/24/2019         Source:sciencedirect.com

While for the reductive cleavage of a cyclopropane σ-bond usually two lithium atoms are necessary, with the same amount of lithium two σ-bonds of the “butterfly olefin” 4 are cleaved. On the way to 1,6-dilithio-3-hexyne (7) (1,3-dilithiopropylidene)cyclopropane (8) can be isolated provided that diethyl ether is used as the solvent.

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