Triphenylcarbethoxymethylenephosphorane

Triphenylcarbethoxymethylenephosphorane is an organophosphorus compound with the chemical formula Ph₃PCHCO₂Et (Ph = phenyl, Et = ethyl). It is a white solid that is soluble in organic solvents.

The compound is a Wittig reagent. It is used to replace oxygen centres in ketones and aldehydes with CHCO₂Et.