The synthesis of -halo ylids stabilized by carbethoxy, benzoyl, and carbamyl groups has been demonstrated by two independent general methods. Dehalogenation of the phosphonium salts derived from the reaction of dichloromethylenetriphenylphosphorane and acyl halides constitutes the first method. The second involves dehydrohalogenation of phosphonium salts obtained by halogenation of ylids. These halo ylids undergo the (1) A.
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