On flash-vacuum pyrolysis, the oxazinone (3) is fragmented to diphenylacetylene, benzonitrile, and carbon dioxide; the oxazinones (4) and (6), on the other hand, undergo ring-opening to the isocyanates (5) and (7), respectively, which cyclise at room temperature.
P. W. Manley, R. C. Storr, A. E. Baydar and G. V. Boyd, J. Chem. Soc., Chem. Commun., 1978, 902 DOI: 10.1039/C39780000902
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