S. Sun
1982
Citations
0
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Citations
Journal
Acta Chimica Sinica
Abstract
2, 4, 6-Trimethyl-2, 4, 6-tris(3', 3', 3'-trifluoropropyl) cyclotrisiloxane, D_3~F, is synthesized by reacting 3, 3, 3-trifluoropropyl magnesium chloride with methyltrimethoxysilane(1), which may simultaneously act as reactant and as solvent in place of ether in Grignard reagent formation. The reaction product, 3, 3, 3-trifluoropropylmethyldimethoxysilane(3), undergoes hydrolysis with HCl, and the hydrolysate is cracked and fractionated in the presence of KOH. D_3~F is formed in good yield and high purity suitable for the preparation of fluorosilicone elastomer directly. This method seems to be safe and convenient when it is compared with the industrial method of adding gaseous 3, 3, 3-trifluoropropene with methyldichlorosilane under pressure in the presence of platinum catalyst.