Addition reactions of polyhalides to ketene silyl acetals and silyl enol ethers under thermal or photo-irradiated conditions without a promoter

The reactions of ketene silyl acetals and sityl enol ethers in a CCl4 solution containing no promoter under ambient temperature, reflux, or photo-irradiation conditions afforded products via the addition of a trichloromethyl group to those silyl substrates. Polyhalides other than CCl4 were subjected to photoreactions in a hexane solution, resulting in the formation of carbonyl derivatives based on the addition of polyhalogenated alkyl groups.