1: 2,2'-dibromo-octafluorobiphenyl With n-butyllithium in diethyl ether; hexane T=-78°C; 2 h; Inert atmosphere; 2: phenylphosphonous dichloride in tetrahydrofuran; diethyl ether; hexane T=-78 - 20°C; 8 h; Inert atmosphere;