1: phenylacetylene With n-butyllithium in diethyl ether; hexane T=-78°C; 3 h; 2: tri-isopropoxy-borane in diethyl ether; hexane T=-78 - 20°C; 3 h;

boron trifluoride diethyl etherate in dichloromethane T=40°C; 3 h;

n-butyllithium; alkaline hydrogen peroxide 1.) THF, -78 deg C, 0.5 h; room temperature, 1.5 h; Yield given. Multistep reaction;