1: chloro-diphenylphosphine With lithium in tetrahydrofuran T=20°C; 3 h; Inert atmosphere; 2: 3-(triethoxysilyl)propyl chloride in tetrahydrofuran T=0 - 20°C; 16.5 h; Inert atmosphere;

in tetrahydrofuran T=15 - 20°C;