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[reaction: see text]. An unexpected 1-methylimidazole-catalyzed reaction of dimethyl acetylenedicarboxylate (DMAD) with in situ generated arylketenes leading to the synthesis of dimethyl 2-arylidenesuccinates under mild conditions is described. A plausible mechanism has been proposed.
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Ding et al. (2005) studied this question.
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