3-(Methacryloyloxy)propyltris(trimethylsiloxy)silane

2754-27-0

2530-85-0

17096-07-0

To a 500 mL three-necked flask equipped with a constant pressure dropping funnel, magnetic stirrer, Dean-Stark splitter and condenser tube, 124.18 g (0.5 mol) of 3-(methacryloyloxy)propyltrimethoxysilane was added under nitrogen protection, followed by 0.15 g of trifluoromethanesulfonic acid and 0.15 g of BHT.A 198.35 g (1.5 mol) of trimethylsilyl acetate was added to the reaction flask by slow dropwise addition through the constant pressure dropping funnel at 80 °C. 198.35 g (1.5 mol) trimethylsilyl acetate to the reaction flask. During the dropwise addition, most of the low-boiling by-products were continuously distilled and collected through a Dean-Stark splitter side tube. After the dropwise addition was completed, stirring of the reaction mixture was continued for 1 hour. The reaction mixture was transferred to a dispensing funnel and washed six times with 100 mL of water until a neutral colorless clear liquid was obtained. A small amount of low-boiling impurities was removed by rotary evaporation under reduced pressure to yield 198.08 g of 3-(1,1,1,5,5,5-hexamethyl-3-((trimethylsilyl)oxy)trisiloxan-3-yl)propyl methacrylate in 93.7% yield.