In a neutral medium, oxidation by manganese dioxide of N-o-aminophenyl-, N-o-aminobenzyl-, and N-o-carboxyphenyl-amines gave benzimidazoles, quinazolones, and benzoxazinones, respectively. Similarly, o-alkylbenzoic acids yielded phthalides. Reaction mechanisms and spectral data of various products are discussed.
O. Meth-Cohn, H. Suschitzky and M. E. Sutton, J. Chem. Soc. C, 1968, 1722 DOI: 10.1039/J39680001722
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