STUDY OF THE ALKYLATION OF CHLOROSILANES .2. SYNTHESIS OF (FLUOROALKYL)CHLOROSILANES AND TETRA(FLUOROALKYL)SILANES VIA HYDROSILYLATION

The hydrosilylation of various fluorinated olefins and of a diene with different chlorosilanes and with a tri(fluoroalkyl)silane, in the presence of a peroxide or a Pt catalyst, is reported. The reactivity is influenced considerably by the structure of the silane and of the fluorinated olefin. The following (fluoroalkyl)chlorosilanes and (fluoroalkyl)-alpha,omega-chlorodisilanes are described; C6F13(CH2)nSiR1R2Cl where n = 2 or 3 and (ClR1R2SiC2H4C3F6)2 with R1 = R2 = Cl, R1 = Cl and R2 = CH3 or C2H4CF3, R1 = R2 = CH3 and R1 = CH3 and R2 = C6H5. Three new tetra(fluoroalkyl)silanes have also been synthesized. All the products were characterized by H-1, F-19 and Si-29 NMR spectroscopy.