METHOD FOR PREPARING 1,1-DICHLORO-2,2-BIS-(4-CHLOROPHENYL)- ETHYLENE Russian patent published in 2005 - IPC

FIELD: chemistry of organochlorine compounds, chemical technology.

SUBSTANCE: method involves treatment of 1,1,1-trichloro-2,2-bis-(4-chlorophenyl)-ethane with solid calcium hydroxide or a mixture of solid calcium hydroxide and solid sodium hydroxide with the content of sodium hydroxide in mixture 30%, not above, in the molar ratio 1,1,1-trichloro-2,2-bis-(4-chlorophenyl)-ethane to alkali = 1:(1.5-1.75) at heating in the presence of catalyst. As catalysts method involves benzyltrialkyl ammonium halides, preferably, benzyltriethyl ammonium chloride or benzyltrimethyl ammonium bromide, tetraalkyl ammonium halides, preferably, tetrabutyl ammonium bromide taken in the amount 0.0005-0.005 mole. Invention provides the development of a new method for preparing 1,1-dichloro-2,2-bis-(4-chlorophenyl)-ethylene allowing to enhance ecological safety of technological process and to improve quality of the end product.

EFFECT: improved method preparing.

2 cl, 15 ex