1: para-bromobenzonitrile With tert.-butyl lithium in diethyl ether; pentane T=-78°C; 0.5 h; 2: With zinc dibromide in tetrahydrofuran; diethyl ether; pentane T=-78 - 0°C; 0.5 h; 3: 1-bromo-2-iodoethylene With trifuran-2-yl-phosphane; Cl2Pd[bis(2-diphenylphosphinophenyl)ether]; diisobutylaluminium hydride in tetrahydrofuran; diethyl ether; hexane T=0°C; 4 h;

T=175°C;