Sodium Hydroxide → 5,6-Dihydro-1,5-dioxo-1H-pyrazolo[1,2-a][1,2,4]benzotriazine-2-carboxylic acid
Reaction equation
[O:1]=[C:2]1[N:6]2[C:7]3[CH:15]=[CH:14][CH:13]=[CH:12][C:8]=3[NH:9][C:10](=[O:11])[N:5]2[CH:4]=[C:3]1[C:16]([O:18]CC)=[O:17].[OH-].[Na+]>C(O)C>[O:1]=[C:2]1[N:6]2[C:7]3[CH:15]=[CH:14][CH:13]=[CH:12][C:8]=3[NH:9][C:10](=[O:11])[N:5]2[CH:4]=[C:3]1[C:16]([OH:18])=[O:17]Participants
4
Procedure
To a solution of 3 g of 5,6-dihydro-1,5-dioxo-1H-pyrazolo[1,2-a][1,2,4]benzotriazine-2-carboxylic acid, ethyl ester of hot ethanol, there is added 10 ml of 10% aqueous sodium hydroxide and the mixture refluxed for 2 hours. The mixture is concentrated under reduced pressure and the residue dissolved in water. The solution is filtered and neutralized with dilute hydrochloric acid. The precipitated 5,6-dihydro-1,5-dioxo-1H-pyrazolo[1,2-a][1,2,4]benzotriazine-2-carboxylic acid is filtered and washed with a small amount of cold water. The product is crystallized from ethanol.