Isopropanol → 1-(2-Methylphenethyl)-3-vinyltetramethyldisiloxane

Participants

Reaction Conditions

Reaction Steps

The following were charged to a 1 L roundbottom flask equipped with a stirrer, thermometer, and addition funnel and heated to 70° C.: 375 g (3.15 mol) alpha-methylstyrene and 0.6 mL 1% isopropanolic chloroplatinic acid solution. 285 g (3.0 mol) dimethylchlorosilane was then dripped in from the addition funnel over 1 hour. The reaction was subsequently maintained at 80° C. for 1 hour and cooled. 212 g (1.0 mol) of the 2-methylphenethyldimethylchlorosilane product and 217 g (1.8 mol) dimethylvinylchlorosilane were dripped into a mixture of 300 g water and 100 g isopropyl alcohol. The resulting hydrolyzate was washed with water 3 times, the water (lower) layer was removed, and heating in vacuo produced 180 g (65% of the theoretical yield) 1-(2-methylphenethyl)-3-vinyltetramethyldisiloxane . This 1-(2-methylphenethyl)-3-vinyltetramethyldisiloxane had a refractive index of 1.471, a viscosity of 2.2 centistokes, and a boiling point of 121° C./5 mmHg.

Provenance & Evidence