Abstract By diazotization of 3-(2-aminophenyl)-1, 2-dihydroquinoxaline 1c, its 3-(4- aminophenyl)-isomer2c, 3-(2-aminobenzyl)-1, 2-dihydroquinoxaline-2-one 3c and its 3-(4- aminobenzyl)-isomer 4c and by azo coupling of formed diazonium salts with ethyl