Aryl 2-azidobenzoates undergo vapour-phase pyrolysis to give carbazoles in moderate yield: alternatively, 4-methylacridan and acridone are formed from 2,6-dimethylphenyl and salicyl 2-azidobenzoates respectively, all the products being derived from 6-membered spirobenz[1,3]oxazinone intermediates.
M. G. Clancy, M. M. Hesabi and O. Meth–Cohn, J. Chem. Soc., Chem. Commun., 1980, 1112 DOI: 10.1039/C39800001112
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