| 摘要 |
A process for preparing 2-methoxy-3,6-dichlorobenzoic acid of a purity in excess of 95 wt.% comprises reacting a mixt. of 10-90 wt.% 2-methoxy-3,6-dichlorobenzoic acid and 90-10 wt.% 2-methoxy-3,5- dichlorobenzoic acid with an alkanol. The reaction occurs in an inert organic reaction medium in the presence of an acid catalyst, at a temp. sufficiently elevated to remove the esterification water as it forms and, thereafter, recovering the 2-methoxy-3,6-dichlorobenzoic acid.
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