申请人:Mitsubishi Gas Chemical Company, Inc.
公开号:EP1559701A1
公开(公告)日:2005-08-03
A process is provided for producing an alkyl aromatic compound having substituents at the 3- and 5-positions by alkylating an aromatic compound having two substituents in the meta positions with an olefin having 2 to 4 carbon atoms in the presence of a Broensted acid, followed by addition of a Lewis acid and isomerization in the copresence of the Broensted acid and the Lewis acid. According to the present invention, 3,5-dimethylethylbenzene, 3,5-dimethylcumene, etc. may be produced in a stable manner with high yield and high selectivity under mild and simple reaction conditions. The alkyl aromatic compounds having substituents at the 3- and 5-positions are useful as intermediates for functional chemicals for use in pharmaceutical, agricultural and electronic materials. With the method of the present invention, the catalyst used can be recovered and recycled. Thus, desired alkyl aromatic compounds may be obtained economically in an industrially advantageous manner while reducing the load on the environment.
本发明提供了一种生产具有 3 位和 5 位取代基的烷基芳香族化合物的工艺,其方法是:在布氏酸存在下,用具有 2 至 4 个碳原子的烯烃将具有 2 个元位取代基的芳香族化合物烷基化,然后加入路易斯酸,并在布氏酸和路易斯酸共存下进行异构化。根据本发明,在温和简单的反应条件下,可以稳定地生产出 3,5-二甲基乙基苯、3,5-二甲基异丙苯等高产率和高选择性的产品。在 3 位和 5 位上具有取代基的烷基芳香化合物可用作功能化学品的中间体,用于制药、农业和电子材料。采用本发明的方法,所使用的催化剂可以回收和循环使用。因此,可以以一种对工业有利的方式经济地获得所需的烷基芳香化合物,同时减少对环境的负荷。