[OH-].[Na+].[Cl-].CC(C)CCCCCCCCCCC[NH2+]CC1C=CC=CC=1.[Cl:26][C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][C:28]=1[CH:33]([C:38]1[CH:43]=[CH:42][CH:41]=[CH:40][C:39]=1[Cl:44])[C:34](Cl)([Cl:36])[Cl:35]>ClC1C=CC=CC=1>[Cl:26][C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][C:28]=1[C:33]([C:38]1[CH:43]=[CH:42][CH:41]=[CH:40][C:39]=1[Cl:44])=[C:34]([Cl:35])[Cl:36]201.5 g of 28% strength aqueous sodium hydroxide and 2.0 g of dimethyllaurylbenzylammonium chloride were added to a solution of 250 g of 1,1-bis(chlorophenyl)-2,2,2-trichloroethane in 100 g of monochlorobenzene at 50° C. The mixture was heated at reflux (90° C.) for 20 hours. The organic phase was separated by phase separation and was washed three times with 100 g of water. After distillation of the monochlorobenzene, 219.3 g of 1,1-bis(chlorophenyl)-2,2-dichloroethylene were obtained (y=97.8%) with 0.10% of 1,1-bis(chlorophenyl)-2,2,2-trichloroethane.
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