1: 2,2'-di(seleno)bis(benzoic acid) With sodium hydroxide; sodium tetrahydroborate pH=9 - 10; 2: benzyl chloride in water T=20°C; 12 h; Further stages.;

pyridine; oxalyl dichloride; N,N-dimethyl-formamide 1.) CH2Cl2, r.t., 4 h, 2.) CH2Cl2, r.t., overnight; Yield given. Multistep reaction;

1: 91 percent 2: phosgene / toluene; dimethylformamide; benzene / 96 h / Ambient temperature 3: 1.) ether, overnight, 2.) benzene, irradiation, 3 h View Scheme