Question: Tran?s alkenes are converted into their cis isomers and vice versa on epoxidation followed by treatment of the epoxide with triphenylphosphine. Propose a mechanism for

Tran?s alkenes are converted into their cis isomers and vice versa on epoxidation followed by treatment of the epoxide with triphenylphosphine. Propose a mechanism for the epoxide ? alkene reaction.

RCO3H (Phl3P R' (Ph)3P 0 R' R'

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