4-bromooctafluorobutanetriethoxysilane; water; Rhodium trichloride; copper(II) nitrate in tetrahydrofuran 9 h; Ambient temperature; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

potassium hydroxide in methanol T=50°C; electrolysis, Pt-electrodes, 150 mA/cm-2; Title compound not separated from byproducts;