The possible competition between Curtius rearrangement of diphenylcarbamyl azide (IC) and displacement of its azide function by extraneous bases has been examined. In pyridine or ethanol as solvent the Curtius reaction was dominant, the sole products of aminolysis being l, l-diphenyl-4-substituted semicarbazides (IV). When various amines were employed as both solvents and reactants, effective competition with the facile intramolecular ...
