Abstract
The photolysis of o-azidobenzoic acid in solutions, adsorbed on silica gel, and in a crystalline state was studied by IR and UV spectroscopy and thin-layer chromatography. It was found that the photolysis resulted in the formation of 2,1-benzisoxazolone (the product of intramolecular cyclization of singlet nitrenes) and anthranilic acid and o,o"-dicarboxyazobenzene (the reaction products of triplet nitrenes). The formation of 2,1-benzisoxazolone is a reversible reaction because of the secondary photolysis to singlet nitrenes, which leads to an increase in their concentration in the system.
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