C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/640, 260/627
C07C 29/92 (2006.01) A01N 31/04 (2006.01) C07C 33/46 (2006.01) C07C 49/403 (2006.01) C07C 317/04 (2006.01) C07D 213/16 (2006.01) C07D 319/12 (2006.01)
Patent
CA 2020920
Disclosed is a process for the preparation of 1,1-bis(4-chlorophenyl)-2,2,2-trichloroethanol (known as p, p'-dicofol), starting out from a mixture containing this compound, i.e. 1,1-bis(4-chlorophenyl)-2,2,2-trichloro- ethanol, in admixture with at least one compound selected from the group consisting of 1-(4-chlorophenyl)-1-(2-chloro- phenyl)-2,2,2-trichloroethanol (known as o,p'-dicofol); 1-(4-chlorophenyl)-1-(2-chlorophenyl)-2,2,2-trichloroethane (known as o,p'-DDT); and 1-(4-chlorophenyl)-1-(2-chloro- phenyl)-2,2-dichloroethylene (known as o,p'-DDE). This process which permits to separate biologically active p,p'-dicofol in large yield from raw dicofol, basically comprises the formation of an addition compound between 1,1-bis(4- chlorophenyl)-2,2,2-trichloroethanol and a second moderately electron donating compound, such as a hydroxylated substance, an ether, a ketone, a carboxylic acid, a sulphoxide and a nitrogenated derivative; the isolation of the addition compound being formed; and the subsequent decomposition of the addition compound to recover the desired compound.
Adrubau Jaime P.
Sola Jaume C.
Atochem
Robic
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