The formation of 01 carbanions of carboxylic acids and esters by means of nonnucieophilic bases such as disubstituted lithium amides has recently been widely investigated owing to their great synthetic utility. At the present time, the reactions of these anions with electrophilic substrates are restricted to alkyl halides, lG halogens, 7 epoxides,'alkyl nitrates, s substituted ammonia~,~ alkyl silyl chlorides, 1 and carbonyl compounds such as C02. 11 esters, 8, 12 ...
