Comparison of the 1H n.m.r. spectra of phenylglyoxal bisarylhydrazones and their monoacetyl derivatives in hexamethylphosphoramide shows that acetylation occurs at the NH group of the –CH![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
N–NHAr system, and hence that this NH group is that involved in intermolecular rather than intramolecular hydrogen bonding in the phenylglyxoal bisarylhydrazone.
D. L. Hooper and G. A. Dauphinee, J. Chem. Soc., Perkin Trans. 1, 1974, 14a DOI: 10.1039/P1974000014A
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