Pyrolysis of benzyl azidoformate at 300–350 °C gave an oxazolo[3,4-a]azepin-2-one which spontaneously dimerised by [6 + 4]exo-anti-cycloaddition, while the 2,4-dichlorobenzyl ester gave the isomeric syn-dimer; the 4-chlorobenzyl azidoformate gave a 3 : 2 mixture of the anti- and syn-dimers.
O. Meth-Cohn and S. Rhouati, J. Chem. Soc., Chem. Commun., 1980, 1161 DOI: 10.1039/C39800001161
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