申请人:HOECHST CELANESE CORPORATION
公开号:EP0564083A1
公开(公告)日:1993-10-06
In one embodiment this invention provides a process for converting a pyridine-2,3-dicarboxylic acid diester to the corresponding cyclic anhydride directly, without any recovery and purification of the pyridine-2,3-dicarboxylic acid intermediate.
An important aspect of the invention process is the utility of pure pyridine-2,3-dicarboxylic acid diester starting matter. A procedure for providing pure diester starting material is demonstrated.
在一个实施方案中,本发明提供了一种将吡啶-2,3-二羧酸二酯直接转化为相应的环酸酐的工艺,无需回收和提纯吡啶-2,3-二羧酸中间体。
本发明工艺的一个重要方面是纯吡啶-2,3-二羧酸二酯起始物的实用性。本发明展示了一种提供纯净二酯起始原料的程序。