A highly nucleophilic triarylphosphine, [2, 4, 6-(CH3O)3C6H2]3P, was found to work as a convenient and excellent catalyst for the Michael addition reactions of CH2=CHCN, CH2=CHCOOCH2CH3, and CH2=CHC(O)CH3 with some nitroalkanes.
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Wada et al. (1987) studied this question.
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