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Acetylene di-and (less easily) monocarboxylic esters replace nitriles from the 4,5-position of 1,2,4,3-triazaphosphole rings to give carboxyl derivatives of 1,2,3-diazaphospholes, presumably by a cycloaddition/cycloreversion mechanism. In cases with a mobile N-substituent alternatively the loss of N 2  seemed feasible, but was normally not observed.

zeitschrift für naturforschung b

Überführung von Triazaphospholen in Diazaphosphole durch Acetylenaddition/Nitrileliminierung [1] / Conversion of Triazaphospholes into Diazaphospholes by Acetylene Addition/Nitrile Elimination [1]