J. Org. Chem., 1967, 32 (9), pp 2701–2704
Reactions of o-halophenylazo phenyl sulfones and of (o-chlorophenyl)triphenylphosphonium iodide with sodium methoxide in methanol.
Joseph F. Bunnett, Duncan A. R. Happer
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http://dx.doi.org/10.1021/jo01284a012