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Intermediate, introduced by Danishefsky, which undergoes homoconjugate additiion of nucleophiles, behaving as the synthetic equivalent of +CH2CH2CH(COOH)2: J. Am. Chem. Soc., 97, 3239 (1975); J. Org. Chem., 40, 2969 (1975); 41, 1668 (1976). For an example in heterocyclic synthesis, see: Org. Synth. Coll., 7, 411 (1990):/n