Gas-phase pyrolysis of the 1,2,3-triazoles 3–6 gives the pyrazolopyrimidinones 11–13 and the quinolinone 14 respectively: the mechanism involves an oxoketenimine–imidoylketene rearrangement.
D. Clarke, R. W. Mares and H. McNab, J. Chem. Soc., Chem. Commun., 1993, 1026 DOI: 10.1039/C39930001026
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