反应详情

A solution of 24 g of bentazone (IIa) in 216 g of 1,2-dichloroethane was treated with stirring at 50°-60° C. with 34 g of ammonia water (5% strength solution of ammonia in water). After addition was complete, the aqueous phase was separated off at 50°-60° C. On cooling the aqueous phase, the bentazone-ammonium was deposited in crystalline form. The solid was separated off at 20° C. by filtration and freed from solvent residues under reduced pressure and at 50° C. 11.8 g of bentazone-ammonium (m.p. 180° C.) were obtained. By evaporating the water from the mother liquor under reduced pressure and at 50°-60° C., a further 13.7 g of bentazone-ammonium were obtained.

1. additionAfter addition
2. customthe aqueous phase was separated off at 50°-60° C
3. temperatureOn cooling the aqueous phase
4. customThe solid was separated off at 20° C. by filtration
5. customfreed from solvent residues under reduced pressure and at 50° C