The selective synthesis of ethyl 4-(diethoxyphosphinyl)-3-oxobutanoate (7) and the utilization of its trimethylsilyl enolether (14) in a tandem desilylation Horner-Wittig condensation is illustrated. ... The selective synthesis of ethyl 4-(diethoxyphosphinyl)-3-oxobutanoate (7) and the utilization of its trimethylsilyl enolether (14) in a tandem desilylation Horner-Wittig condensation is illustrated. ... View all references deprotection of the reaction products was still an ...