Add time:08/06/2019         Source:sciencedirect.com

The reactions of cis- and trans-2-lithio-2-butenes with cobaltous ion yield 3,4-dimethyl-2,4-hexadienes. The products are formed with essentially complete retention of stereochemistry. Neopentyl- and neophyllithium [(β,β-dimethylphenethyl)lithium] react with cobaltous ion to give unrearranged monomeric and dimeric products. n-Butyllithium reacts with cobaltous ion to give butane and butenes in very nearly equal quantities. Small amounts of n-octane are also formed. The mechanisms of these reactions are discussed in terms of intermediate organocobalt compounds.

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