Trimethylsilylmethyl ketones, readily from acyl chlorides, undergo a Reformatsky—Peterson reaction sequence to give 3-alkenoates regioselectivity. Acylsilanes, however, react with either zinc ester enolates or trimethylsilymethylmagnesium chloride to give the corresponding tertiary alcohols which, depending on their structure, spontaneously undergo either elimination or a Brook rearrangement—Peterson