Abstract Some novel 3-substituted benzoquinoxalinones [R= H, CH 3, C 6 H 5,(CH 2) 2 COOH] were synthesized by the Hinsberg reaction between 2, 3-diaminonaphthalene and several α-dicarbonyl compounds. The course of the reactions was followed by the second uv/visible Derivative Spectroscopy Method at different pH values (-0.89 to 9.0) and also in organic solvents at 25. The compound non-substituted at C-3 was the only one that could ...