反应详情

温度

0 °C

5-Nitro-1H-benzotriazole was dissolved in conc. sulphuric acid (60 ml) and cooled to 0° C. in an ice bath. Nitric acid (60 ml, excess) was added drop wise to the cooled solution over a period of 20 minutes. Stirring was continued for another 15 minutes at 0° C. and then at 115° C. overnight, by which time TLC (A) indicated the conversion of starting material. The solution was cooled to room temperature and poured over ice to precipitate a pale yellow solid and a clear yellow solution. The solid was collected by filtration and washed with copious amounts of water until neutral to afford [19] in 67% yield. Rf (A) 0.34; δH(400 MHZ; DMSO-d6) 9.02 (2H, s, BT); m/z (FAB) 210.02695 [(M+H)+ calc. for C6H4N5O4 210.02633].

1. customat 115° C.
2. customovernight
3. temperatureThe solution was cooled to room temperature
4. additionpoured over ice
5. customto precipitate a pale yellow solid
6. filtrationThe solid was collected by filtration
7. washwashed with copious amounts of water until neutral