申请人:ISHIHARA SANGYO KAISHA, LTD.
公开号:EP0596491A1
公开(公告)日:1994-05-11
A method for halogenating an aromatic compound, which comprises reacting the aromatic compound of the formula (I):
wherein X is a hydroxyl group, an amino group or an acylamino group, each of Z1 and Z2 is a hydrogen atom or a halogen atom, one of R and Y is a hydrogen atom and the other is a nitro group, a cyano group or a trifluoromethyl group, and Q is a nitrogen atom or -C(T)= (wherein T is a hydrogen atom, a halogen atom, a nitro group, a cyano group or a trifluoromethyl group), with a halogenating agent to obtain a 3-halogenoaromatic compound of the formula (II):
wherein one of R' and Y' is a halogen atom and the other is a nitro group, a cyano group or a trifluoromethyl group, and X, Z1, Z2 and Q are as defined above, wherein the aromatic compound of the formula (I) is reacted with a halogenating agent to form a halogenoaromatic compound of the formula (III):
wherein E is -O-Hal or
(wherein A is a hydrogen atom or an acyl group, and Hal is a halogen atom), and Z1, Z2, R, Y and Q are as defined above, and this halogenoaromatic compound of the formula (III) is subjected to a rearrangement reaction in the presence of a proton donor to form the 3-halogenoaromatic compound of the formula (II).
一种卤化芳香族化合物的方法,包括使式(I)的芳香族化合物反应:
其中 X 为羟基、氨基或酰氨基,Z1 和 Z2 各为氢原子或卤素原子,R 和 Y 中的一个为氢原子,另一个为硝基、氰基或三氟甲基、和 Q 是氮原子或-C(T)=(其中 T 是氢原子、卤素原子、硝基、氰基或三氟甲基),用卤化剂进行卤化,得到式(II)的 3-卤代芳香族化合物:
其中 R'和 Y'之一为卤素原子,另一个为硝基、氰基或三氟甲基,X、Z1、Z2 和 Q 如上所定义,式(I)的芳香族化合物与卤化剂反应生成式(III)的卤芳烃化合物:
其中 E 是 -O-Hal 或
(其中 A 为氢原子或酰基,Hal 为卤素原子),Z1、Z2、R、Y 和 Q 如上文所定义,该式(III)卤芳香族化合物在质子供体存在下进行重排反应生成式(II)3-卤芳香族化合物。