Abstract

Oxidation of N,N-disubstituted hydroxylamines by N-methylmorpholine N-oxide (NMO) and catalytic amounts of tetra-n-propylammonium perruthenate (TPAP) at room temperature occurs very rapidly to give the corresponding nitrones, which can be trapped by dipolarophiles present in the reaction mixture, in excellent yields. A competitive experiment in the presence of a primary alcohol gave a > 50:1 nitrone to aldehyde ratio.

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