申请人:Shell Internationale Research Maatschappij B.V.
公开号:US05183907A1
公开(公告)日:1993-02-02
Diphenyl ether derivatives of formula II ##STR1## wherein R.sub.1 represents a hydrogen or halogen atom or an alkyl or haloalkyl group, R.sub.2 and R.sub.3, which may be the same or different, each independently represents a hydrogen or halogen atom, or an alkyl, haloalkyl, nitro or cyano group, and R.sub.6 represents a hydrogen atom or an alkyl group, useful as intermediates in the preparation of diphenyl ether herbicides, are prepared by treating a compound of formula III ##STR2## where R.sub.1, R.sub.2 and R.sub.3 are as defined above with a dicarboxylic acid of formula R.sub.6 --CH(COOH).sub.2, where R.sub.6 is as defined above, in the presence of an organic base.
公式II的二苯醚衍生物 ##STR1## 其中R.sub.1代表氢原子、卤素原子、烷基或卤代烷基,R.sub.2和R.sub.3可以相同也可以不同,每个独立地代表氢原子、卤素原子、烷基、卤代烷基、硝基或氰基,而R.sub.6代表氢原子或烷基,可用作二苯醚除草剂的中间体,通过在有机碱存在下处理公式III的化合物制备,其中R.sub.1、R.sub.2和R.sub.3如上定义,而公式III为 ##STR2## 其中R.sub.1、R.sub.2和R.sub.3如上定义,而R.sub.6为上述定义。