sodium tetrahydroborate; selenium in N,N-dimethyl-formamide T=40 - 50°C; 1 h;

2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in benzene 2.5 h; Heating;

1: (1'-14C)-dodecanoic acid With thionyl chloride 3 h; 2: 2,2,2-trichloroethyl alcohol With triethylamine in dichloromethane T=20°C; 8 h; Further stages.;