1: With n-butyllithium in diethyl ether; hexane T=0 - 20°C; 0.5 h; 2: With zinc(II) chloride in toluene T=120°C; 1 h; 3: With ammonium chloride in water; toluene

cobalt/rhodium in tetrahydrofuran T=90°C; P=15201 Torr; 5 h;