Reaction of Diaryl-1,2-diones with Triphenylphosphine and Diethyl Azodicarboxylate Leading to <i>N</i>,<i>N</i>-Dicarboethoxy Monohydrazones via a Novel Rearrangement<sup>†</sup> NairVijay BijuA. T. AbhilashK. G. MenonRajeev S. SureshEringathodi 2005 A mechanistically novel reaction of diaryl-1,2-diones with diethyl azodicarboxylate and triphenylphosphine to afford <i>N</i>,<i>N</i>-dicarboethoxy monohydrazones is described. The reaction proceeds via a nitrogen to nitrogen migration of a carboethoxy group.