Benzotriazinone loses nitrogen on thermolysis in solution to give a heterodiene which reacts with dienophiles such as benzyne and p-methoxybenzaldehyde. Isatoic anhydride in hot solvents is attacked nucleophilically by esters with loss of carbon dioxide to give benzoxazinones.
H. E. Crabtree, R. K. Smalley and H. Suschitzky, J. Chem. Soc. C, 1968, 2730 DOI: 10.1039/J39680002730
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