The thermolysis of 1,2,3-benzotriazin-4(3H)-one gives quinazolino[3,2-c][1,2,3]benzotriazin-8-one, identified by hydrolysis and synthesis. Nucleophilic replacement reactions of the simple benzotriazinone readily provide substituted o-aminobenzoyl derivatives and ring-closed products resulting from these derivatives.
A. W. Murray and K. Vaughan, J. Chem. Soc. C, 1970, 2070 DOI: 10.1039/J39700002070
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