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Triphenylphosphine in combination with methyl acrylate was found to be able to catalyze the Henry (nitroaldol) reaction of various aldehydes and α-keto esters to give the corresponding β-nitroalkanols in good to excellent yields, and a catalytic cycle involving a zwitterionic phosphine–alkene adduct was proposed for this dual-reagent organocatalysis according to the deuterium-labeling experiments...
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