4-bromooctafluorobutanetriethoxysilane; [Rh(.eta.6-C6H5F)(bis(dicyclohexylphosphino)methane)][B(C6H3-3,5-(CF3)2)4] in 1,2-dichloro-ethane T=25°C; 1 h; Inert atmosphere;

n-butyllithium in tetrahydrofuran T=-78 - 20°C; 1 h;