Dichloroketene, generated from trichloroacetyl chloride and activated zinc, has been found to react readily with silyl enol ethers. In most cases, good yields of 3-siloxy-substituted dichlorocyclobutanones could be isolated. The reaction appears to be both regio-and stereospecific. Mild acid hydrolysis of the siloxycyclobutanones afforded the corresponding 3-hydroxydichlorocyclobutanones. In some cases, cyclobutane ring opening or ...
