1: hexamethyl-silane With N,N,N',N',N'',N''-hexamethylphosphoric triamide; sodium methylate T=20°C; 4 h; Inert atmosphere; 2: 1-bromobicyclolt;2.2.2gt;octane With N,N,N',N',N'',N''-hexamethylphosphoric triamide Inert atmosphere;