1: (dimethylamino)trimethylsilane; isobutyraldehyde With lithium perchlorate in dichloromethane T=20°C; 0.0833333 h; 2: (phenylethynyl)magnesium chloride With lithium perchlorate in dichloromethane T=20°C; Mannich reaction; 1 h;

in diethyl ether 1 h; Ambient temperature; Yield given;