SYNTHESIS OF FLUOROSILANES FROM CHLOROSILANES - THE USE OF HEXAFLUOROSILICATES

The conversion of chlorosilanes to fluorosilanes has been studied by using sodium and ammonium hexafluorosilicate. Of particular interest has been their efficacy in the conversion of highly hindered chlorosilanes like dimesityldichlorosilane and di-tert-butyldichlorosilane. Ammonium hexafluorosilicate is found to be the superior reagent for these conversions, since its reactions are more easily worked up and give higher yields. In addition, ammonium hexafluorosilicate does not affect the Si-H, Si-Si, or Si-O-Si linkages as do many reagents which bring about chlorosilane to fluorosilane conversions.