Electrochemical oxidation of triphenylphosphine in the presence of cyclic enol silyl ethers or enol esters gave 2-oxocycloalkyltriphenylphosphonium salts, which underwent the Wittig reaction with aldehydes to afford (E)-2-alkylidenecycloalkan-1-ones.
T. Takanami, A. Abe, K. Suda and H. Ohmori, J. Chem. Soc., Chem. Commun., 1990, 1310 DOI: 10.1039/C39900001310
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