Process for preparation of aromatic polycarboxylic acids and intermediates therefor
申请人:THE UPJOHN COMPANY
公开号:EP0125342A1
公开(公告)日:1984-11-21
A method is described for autoxidizing particular ortho-dialkyl substituted aromatic compounds using a particular type of solvent which gives rise to the formation of 3-alkanoyloxyphthalide compounds, some of which are novel.
The phthalides in turn are ionically oxidized to their corresponding aromatic polycarboxylic acids.
Combination of the two methods provides a means for converting ortho dialkyl substituted aromatic compounds directly to the corresponding polycarboxylic acids in higher yields and at generally lower overall temperatures and reaction conditions compared to prior art methods.
Polycarboxylic acids so obtained are known to be useful in the preparation of alkyds, polyesters, and the like, and, particularly, in the formation of the corresponding acid anhydrides which are used in the preparation of organic high temperature polymers such as polyamides, polyamideimides, and polyimides.
描述了一种使用特定类型溶剂对特定邻二烷基取代的芳香族化合物进行自氧化的方法,该方法可生成 3-烷酰氧基邻苯二甲酸盐化合物,其中一些是新型化合物。
这些邻苯二甲酸盐又被离子氧化成相应的芳香族多羧酸。
与现有技术相比,这两种方法的结合提供了一种将正交二烷基取代的芳香族化合物直接转化为相应的聚羧酸的方法,收率更高,总体温度和反应条件通常更低。
众所周知,这样得到的聚羧酸可用于制备醇酸树脂、聚酯等,特别是形成相应的酸酐,用于制备有机高温聚合物,如聚酰胺、聚酰胺酰亚胺和聚酰亚胺。