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reaction: see text The reaction of nitroso compounds with enolates, "the nitroso aldol reaction", occurs in high yield to generate alpha-hydroxyamino carbonyl compounds. Yields range from 42% to 98% with N-selectivity >99:1 from commercially available aromatic or aliphatic nitroso compounds and a variety of alkali metal or tin enolates.
Momiyama et al. (2002) studied this question.