The structure of 1,4-bis(3,4dicarboxyphenoxy)benzene dianhydride and other intermediates were confirmed by IR,1H-NMR spectra.

• 用IR,1H-NMR表征了1,4-双(3,4-二羧基苯氧基)苯二酸酐及其他中间体化合物的结构。