1 diethoxy 2 propanone 2 7 nitro 5 o chlorophenyl 3h 1 4 benzodiazepin 2 yl hydrazone in the manner given in example 2 1 1 diethoxy 2 propanone 2 7 nitro 5 o chlorophenyl 3h 1 4 benzodiazepin 2 yl hydrazone can be treated at 0 u00b0 c under nitrogen with concentrated sulfuric acid to give 9 nitro 1 5 dihydro 2 methyl 7 o chlorophenyl as triazino 4 3 a 1 4 benzodiazepin 1 ol in the manner given in example 1 7 chloro 2 hydrazino 5 2 6 difluorophenyl 3h 1 4 benzodiazepine can be reacted with 1 1 dimethoxy 2 butanone in tetrahydrofuran to give 1 1 dimethoxy 2 butanone 2 7 chloro 5 2 6 difluorophenyl 3h 1 4 benzodiazepin 2 yl hydrazone in the manner given in example 2 1 1 dimethoxy 2 butanone 2 7 chloro 5 2 6 difluorophenyl 3h 1 4 benzodiazepin 2 yl hydrazone can be treated at 0 u00b0 c under nitrogen with concentrated sulfuric acid to give 9 chloro 1 5 dihydro 2 ethyl 7 2 6 difluorophenyl as triazino 4 3 a 1 4 benzodiazepin 1 ol in the manner given in example 1 6 bromo 2 hydrazino 5 o fluorophenyl 3h 1 4 benzodiazepine can be reacted with 1 1 dimethoxy 2 pentanone in tetrahydrofuran to give 1 1 dimethoxy 2 pentanone 2 6 bromo 5 o fluorophenyl 3h 1 4 benzodiazepin 2 yl hydrazone in the manner given in example 2 1 1 dimethoxy 2 pentanone 2 6 bromo 5 o fluorophenyl 3h 1 4 benzodiazepin 2 yl hydrazone can be treated at 0 u00b0 c under nitrogen.