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.
一种制备侧链中
氟化和
氯化的二
甲苯的方法,其
化学式为##STR1##其中X代表氢或
氟,Y代表氢或
氯,R.sup.1和R.sup.2相同或不同,代表氢、卤素、三
氟甲基或三
氯甲基基团或脂肪族或芳香族基团,R.sup.1和R.sup.2可以通过碳氢成员相互连接形成芳香环,通过在升高温度下与
化学式为##STR2##其中X、R.sup.1和R.sup.2具有上述含义的化合物,以及具有上述含义的
化学式##STR3##的化合物,在卤素转移催化剂存在下接触。