Nitrene-like behaviour of diazoazoles?
Abstract
Treatment of 4,5-dicyano-2-diazoimidazole, 2-diazoimidazole, and 3-diazopyrazole with 1,1-dimethoxyethene affords azolo-as-triazines (1c), (3c), and (8c), respectively; the involvement as intermediates of either aziridines (d), arising from a ‘nitrene-like reaction’ of diazoazoles, or azoalkenes (b) should be questioned at present.