- 作者: 楊金平
- 作者服務機構: Department of Chemical Energeering, Tatung Institute of Technology, Taipei, Taiwan, R.O.C.
- 中文摘要: Two pairs of isomers of 3- and 2-phthalimido-3(2)benzimidazolylpropanoic acid (V and VI) and 2- and 3-phthalimidobenzimidazopyrrolone (VII and VIII) were produced from the reaction of phthaloylaspartic anhydride (I) with o-phenylenediamine (II). The /sub 13/C-NMR spectra of V and VI both showed 11 carbon signals indicating that the structures of their benzimidazole groups were symmetric. Isomers V and VI were easily distinguished from each other by the chemical-shift-differences (.DELTA..delta.) of the methylene carbon and the methine carbon. Compounds VII and VIII displayed 14 carbon signals and no longer showed the symmetric structure of the benzimidazole moity. The chemical-shift-differences (.DELTA..delta) between methylene carbon and methine carbon in pyrrolones of VII and VIII can also be used to distinguish VII from VIII. The .DELTA..delta. of compound VII is less than that of compound VIII.
- 英文摘要: --
- 中文關鍵字: /sub 13/C-NMR spectrum; phthaloylaspartic anhydride; o-phenylenediamine; phthalimidobenzimidazopyrrolone.
- 英文關鍵字: /sub 13/C-NMR spectrum; phthaloylaspartic anhydride; o-phenylenediamine; phthalimidobenzimidazopyrrolone.