sodium hydroxide; 1,2,2-trichloro-1,1,2-trichloro-ethane; tetrabutylammomium bromide in dichloromethane T=20 - 45°C; 1 h;

sodium hydroxide; tetrabutylammomium bromide

1: 80 percent / dimethylsulfoxide / 5 h / 65 - 70 °C 2: 96 percent / hexachloroethane, 50percent aq. NaOH, tetrabutylammonium bromide / CH2Cl2 / 1 h / 20 - 45 °C View Scheme