Trimethyl borate → Boric Acid

Participants

Reaction Conditions

Reaction Steps

207.6 Grams (2.0 mols) of trimethyl borate was added to 606 g (3.0 mols) of dipropylene glycol monomethacrylate. The mixture was heated to 60° C. with stirring in a dry air atmosphere. The mixture was kept at 60° C. for 1 hour, followed by heating to 75° C. After the temperature reached 75° C., the pressure in the system was gradually reduced. The system was kept at a pressure of 2.67 kPa (20 mmHg) or lower for 6 hours to remove volatile matters produced with progress of ester interchange reaction of boric acid and excess trimethyl borate, followed by filtration to obtain 600 g of a polymerizable boron-containing compound F (an esterification product of boric acid with dipropylene glycol monomethacrylate) represented by the formula (2). An infrared absorption spectrum of the resulting polymerizable boron-containing compound F was measured to confirm that the absorption band originating from hydroxyl group at 3300 cm−1 disappeared.

Provenance & Evidence