反应详情

2.35 g of 3-amino-1-hydroxypropane-1,1-diphosphonic acid are suspended in 100 ml of water and, while stirring, 1N sodium hydroxide solution (approximately 20.0 ml) is added dropwise until neutralisation is complete (pH=7.4). The whole is concentrated to dryness by evaporation under reduced pressure at 60°-70° and dried under reduced pressure (approximately 20 mbar) until the weight is constant. Disodium 3-amino-1-hydroxypropane-1,1-diphosphonate is obtained in the form of an amorphous product that is deliquescent in air and that according to Karl Fischer titration contains approximately 12.9% by weight of water.

1. concentrationThe whole is concentrated to dryness by evaporation under reduced pressure at 60°-70°
2. customdried under reduced pressure (approximately 20 mbar) until the weight