| 摘要 |
PURPOSE:To obtain the title substance useful as an intermediate for agricultural chemicals, drugs, etc., by reacting a 2-halogenated benzotrichloride with a halogenating agent in the presence of L type zeolite as a catalyst. CONSTITUTION:A 2-halogenated benzotrichloride is reacted with a halogenating agent (preferably chlorine gas or bromine) in the presence of L type zeolite as a catalyst to give the title substance. The reaction temperature is selected from a range from 0 deg.C to the boiling point. Crystalline aluminosilicate having 4-8 molar ratio of SiO2/Al2O3 may be cited as the L type zeolite and generally synthetic zeolite or natural zeolite having the same X-ray diffraction spectrum is used. The catalyst may be calcined or uncalcined and the amount of the catalyst used is preferably 1-50g based on 1mol raw material compound. The catalyst may be recycled for a long period of time. |
