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We found an efficient methodology for the Baylis-Hillman reaction of p-nitrobenzaldehyde (1), naphtaldehyde (4a), and pyperonal (4b) with methyl acrylate by using 4-dimethylaminopyridine (DMAP) as a catalyst, without solvent, additives, or any sophisticated equipment. A very important temperature effect was observed.
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Octavio et al. (2003) studied this question.