反应详情

A round bottom flask is charged with dimethylformamide 72 g, acetic anhydride 25 g, pyridine 2 g, and nitrilotriacetic acid 38.2 g and the suspension is nitrogen purged for several minutes. The flask is stoppered and the mixture is stirred at room temperature for 3 days. A small amount of unreacted NTA is filtered out. The bulk of the solvent 79 ml is removed in vacuo at a bath temperature of 60°-70° C. The resulting viscous solution is twice roto-vacued after two successive additions of 40 ml dimethylformamide.

1. custompurged for several minutes
2. filtrationA small amount of unreacted NTA is filtered out
3. customThe bulk of the solvent 79 ml is removed in vacuo at a bath temperature of 60°-70° C