Revised Structures of <i>N</i>-Substituted Dibrominated Pyrrole Derivatives and Their Polymeric Products. Termaleimide Models with Low Optical Band Gaps
作者:Dong-Sook Choi、Shenlin Huang、Mingsheng Huang、Thomas S. Barnard、Richard D. Adams、Jorge M. Seminario、James M. Tour
DOI:10.1021/jo9722055
日期:1998.4.1
bromides migrate from the 2,5-positions to the 3,4-positions with subsequent oxidation at the 2,5-positions to afford N-substituted 3,4-dibromomaleimides; the structure was confirmed by single-crystal X-ray analysis. The maleimides were then polymerized to the poly(N-substituted-3,4-maleimide)s with copper bronze. This constitutes a revision of structure for the monomers and polymers. The propensity
本文介绍了HNO(3)处理后N-取代的2,5-二溴吡咯的意外重排/氧化。溴化物从2,5-位迁移到3,4-位,随后在2,5-位氧化,得到N-取代的3,4-二溴马来酰亚胺;通过单晶X射线分析确认了结构。然后用铜青铜将马来酰亚胺聚合成聚(N-取代的3,4-马来酰亚胺)。这构成了单体和聚合物结构的修订。通过在非氧化酸性条件下(p-TsOH)处理N-苄基-2,5-二溴吡咯得到N-苄基-3,4-二溴吡咯,进一步证实了二溴化物的迁移倾向。原材料和产物结构均通过单晶X射线分析确定。从吡咯中制备了几种亚氨基酰亚胺,马来酸酐和柠康酸酐。当添加碱或亲核溶剂时,这些三聚体化合物的最大吸光度发生变化(约200 nm)。因此,对于那些在使用相同的添加剂处理后发生了350-400 nm的位移的聚合物体系,这些末端酰亚胺是很好的模型。从头算起就用Hartree-Fock和密度泛函理论来评估三聚体系统的最小构象。相对于中央