dibromohexachloroethane; triphenylphosphine in 1,2-dichloro-ethane T=-20 - -18°C; 2.5 h;

1: 95 percent / 0,1percent methylorange, NaBH3CN / tetrahydrofuran; H2O / 1 h 2: 97 percent / triphenylphosphane, dibromohexachloroethane / 1,2-dichloro-ethane / 2.5 h / -20 - -18 °C View Scheme