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For use in a novel pyrrole synthesis, see 1,4-Dichloro-2-butyne, A13300.• Substituents can also be introduced by Michael addition to a wide variety of acceptors: Synth. Commun., 18, 367 (1988).
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Intermediate for synthesis of racemic amino acids, by reaction with an electrophile, e.g alkyl halide, followed by hydrolysis and decarboxylation. The reactivity can be reversed by conversion to the dehydro-derivative, which then undergoes nucleophilic attack with alkyllithiums, Grignards, malonate anion, etc.: Angew. Chem. Int. Ed., 21, 203 (1982):
