1: 1-(trimethylsilyl)-1-propyne With tert.-butyl lithium in tetrahydrofuran; hexane T=0°C; 1 h; Inert atmosphere; 2: B-OMe-9-borabicyclo[3.3.1]nonane in tetrahydrofuran; hexane; pentane T=0°C; 0.583333 h; Inert atmosphere;