Provided is a method for effectively producing a 4,5-dialkoxy-2-hydroxybenzoic acid from an inexpensive raw material.
A method for producing a 2-bromo-4,5-dialkoxybenzoic acid represented by the following formula (2): (wherein each of R
1
and R
2
represents a lower alkyl group), the method including causing a 3,4-dialkoxybenzoic acid represented by the following formula (1): (wherein R
1
and R
2
have the same meanings as defined above) to react with bromine in concentrated hydrochloric acid.
提供了一种有效从廉价原料中生产4,5-二烷氧基-
2-羟基苯甲酸的方法。一种生产如下式(2)所示的2-
溴-4,5-二烷氧基
苯甲酸的方法:(其中R1和R2各自表示较低的烷基基团),该方法包括使如下式(1)所示的3,4-二烷氧基
苯甲酸(其中R1和R2的含义与上文定义相同)与浓
盐酸中的
溴发生反应。