申请人:Wang Ping
公开号:US20130046108A1
公开(公告)日:2013-02-21
Provided is a method for preparing
2,5
-dimethylphenylacetic acid, wherein p-xylene is mixed with paraformaldehyde and concentrated hydrochloric acid in a solvent of ion liquid to obtain
2,5
-dimethyl benzyl chloride by the chloromethylation reaction. Then,
2,5
-dimethyl benzyl chloride is introduced into a reactor with an acid binding agent and a solvent, the carbonylation and hydrolysis reaction is conducted in the presence of a catalyst to obtain
2,5
-dimethylphenylacetic acid. The present process has new route, less synthesis steps, simple operation, lower cost, increased yield, and is friendly to the environment. Therefore, the method is suitable for industrial production.
提供了一种制备2,5-二甲基苯乙酸的方法,其中将对二甲苯与多聚甲醛和浓盐酸混合于离子液体溶剂中进行氯甲基化反应,得到2,5-二甲基苄氯。然后将2,5-二甲基苄氯与酸性结合剂和溶剂一起引入反应器,在催化剂的存在下进行羰基化和水解反应,得到2,5-二甲基苯乙酸。该方法具有新的路线、较少的合成步骤、简单的操作、较低的成本、增加的产量,并且对环境友好。因此,该方法适用于工业生产。