1: 4-ethynyl-1-methoxy-benzene With ethylmagnesium bromide in tetrahydrofuran; diethyl ether T=0 - 20°C; 0.0833333 h; Inert atmosphere; 2: dimethylmono-chlorosilane in tetrahydrofuran; diethyl ether T=0 - 20°C; 4 h; Inert atmosphere;