| abstract |
An addition compound of 1,1-bis(4-chlorophenyl)-2,2,2-trichloroethanol with a moderately electron donating compound such as a hydroxylated substance, an ether, a ketone, a carboxylic acid, a sulphoxide and a nitrogenated derivative. A process based on the selectivity of formation of these addition compounds to make pure 1,1-bis(4-chlorophenyl)-2,2,2-trichloroethanol. Preferred electron donating compound is dimethyl sulphoxide. |