Reactions of certain iminotriphenylphosphoranes derived from o-phenylenediamine with dimethyl acetylenedicarboxylate (DMA) involve Wittig-like elimination of triphenylphosphine oxide from an ester carbonyl group; o-phenylenediamine reacts with DMA in ether to give a mixture of tautomers.
E. M. Briggs, G. W. Brown, W. T. Dawson and J. Jiricny, J. Chem. Soc., Chem. Commun., 1975, 641 DOI: 10.1039/C39750000641
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