Photolysis of 2,6-dichloro-4-azidophenol and 2,6-dibromo-4-azidophenol in N2 or Ar matrices at 12–14 K results in ring expansion, yielding in each case either the corresponding hydroxydidehydroazepine or, in more concentrated matrices, the tautomeric azepin-4-one.
I. R. Dunkin, A. El Ayeb and M. A. Lynch, J. Chem. Soc., Chem. Commun., 1994, 1695 DOI: 10.1039/C39940001695
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