PURPOSE: To obtain the titled compound useful as a raw material for drugs and agricultural chemicals readily and in high yield, by reacting 3,4- dichlorotoluene with CCl4 by the use of a halogenated aluminum catalyst, recovering the prepared compound and reacting the compound with HF.
CONSTITUTION: 1mol 3,4-dichlorotoluene shown by formula I is reacted with 1W20mol CCl4 in the presence of a halogenated aluminum catalyst such as anhydrous AlCl3, etc., at 0W100°C for 20minW4hr and prepared 3,4-dichloro-6- trichloromethyltoluene shown by formula II is recovered and reacted with ≥theoretical amount of HF at 0W150°C at 3W20kg/cm2. The reaction product is washed with an alkali aqueous solution and subjected to vacuum distillation to give the high-purity aimed compound shown by formula III except the reaction product, unreacted CCl4 and further a high-boiling reaction product.
KAWAI TOSHIKAZU
OSHIO HIDEKI
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