The reaction of carboxylic acids, esters, and acid anhydrides with alkenylmagnesium bromide yields mixtures of alkenones and alkenols as the main products. The reaction of vinylmagnesium bromide gives similar results to that of vinylmagnesium chloride. The reactions of isopropenylmagnesium bromide or 1-propenylmagnesium bromide with acids, esters, and anhydrides produce mainly isopropenyl ketones.
