Preparation of trichloromethyl-trifluoro methyl-benzenes
申请人:Bayer Aktiengesellschaft
公开号:US04079090A1
公开(公告)日:1978-03-14
A process for preparing a xylene which is fluorinated and chlorinated in the side chain, having the formula ##STR1## wherein X represents hydrogen or fluorine and Y represents hydrogen or chlorine and R.sup.1 and R.sup.2 are identical or different and represent hydrogen, halogen, a trifluoromethyl or trichloromethyl group or an aliphatic or aromatic radical and R.sup.1 and R.sup.2 can be bonded via hydrocarbon members to form an aromatic ring, By contacting a compound of the formula ##STR2## wherein X, R.sup.1 and R.sup.2 have the above-mentioned meanings, WITH A COMPOUND OF THE FORMULA ##STR3## wherein X, R.sup.1 and R.sup.2 have the above-mentioned meanings, in the presence of a halogen transfer catalyst at elevated temperature.