as an equivalent of the homoenolate anion CH3-CHCH2CHO in reaction with acyl chlorides, the non-substituted α-ethoxyallyltributyltin could not be employed in this way. γ-Methoxyvinyltins, easily prepared by hydrostannation of propargylic ethers, are successfully employed as synthetic equivalents of the homoenolate anions-CH2CH2CHO and -CH2CH2COCH3 in reactions with acyl chlorides. A silylated γ-methoxyvinyltin