1: benzo[d][1,3]dioxol-5-yl-diazonium tosylate With [RhCl(η2:η2-cycloocta-1,5-diene)]2; tetra-(n-butyl)ammonium iodide; triethylamine in N,N-dimethyl-formamide T=20°C; Sandmeyer reaction; 2 h; Inert atmosphere; 2: 4-bromooctafluorobutanetriethoxysilane in N,N-dimethyl-formamide T=20 - 100°C; Inert atmosphere;