1: in benzene T=80°C; 16 h; Inert atmosphere; 2: With ammonium cerium (IV) nitrate in diethyl ether; benzene T=20°C; 3 h; Inert atmosphere;

silver tetrafluoroborate; Co(PPh3)2Cl 2.) CH3CN, 110 deg C, 20 - 40 h; Yield given. Multistep reaction;