1: With n-butyllithium in diethyl ether; pentane T=-78 - 20°C; 24 h; Inert atmosphere; 2: With carbon tetrabromide in diethyl ether; pentane T=-78 - 20°C; Inert atmosphere; 3: With hydrogenchloride; water in diethyl ether; pentane T=20°C; 2 h;

in toluene 3 h; Reflux;