Specific process for preparing silicon compounds bearing fluoroalkyl groups by hydrosilylation

A process for preparing a silicon compound bearing at least one fluoroalkyl group by hydrosilylation of a fluoroolefin in the presence of a Pt-containing hydrosilylation catalyst, the process comprising:

• initially charging and heating a hydrogenchlorosilane;
• metering in the fluoroolefin and reacting the reaction mixture;
• and
• subsequently isolating the hydrosilylation product, and
• wherein the Pt-containing hydrosilylation catalyst consists of a hexachloroplatinic acid or a Pt(0) complex;
• wherein the fluoroolefin has an iodine content from 6.5 ppm to 170 ppm by weight, a diene content from 1 ppm to less than 100 ppm by weight, and a water content of less than 100 ppm by weight.