已经发现并研究了导致苯并[ c ]肉桂醇骨架的新型合成方法。该过程由两个独立的反应组成,第一个是2,2'-二硝基联苯的硝基部分还原,我们认为该过程是通过SET机理进行的,从而得到羟氨基和亚硝基。在接下来的步骤中,环化是在形成-N N-键的情况下进行的。我们认为该过程是通过亚硝基自由基阴离子的自由基机理发生的。该新方法提供了苯并[ c ]肉桂啉或苯并[ c ]肉桂啉N-氧化物,两者的收率均很高,分别为93%和91%。获得苯并[ c在] cinnoline中,反应以醇为溶剂,以醇盐为碱,而对于苯并[ c ] cinnoline N-氧化物,则以水为溶剂,以氢氧化钠为碱。为了建立后一程序,利用统计实验设计和多变量建模来揭示反应的响应面并确定反应的最佳条件。提出了复杂反应机理的建议。在证实该机理的过程中,发现了一种新的脱氧反应,该反应将苯并[ c ] cinnoline N-氧化物转化为苯并[ c
Tailoring Pore Structure and Properties of Functionalized Porous Polymers by Cyclotrimerization
作者:Florian M. Wisser、Kai Eckhardt、Dorothea Wisser、Winfried Böhlmann、Julia Grothe、Eike Brunner、Stefan Kaskel
DOI:10.1021/ma500512j
日期:2014.7.8
Porous polymers were prepared by cyclotrimerization reaction in molten p-toluenesulfonic acid. Their properties could be tailored by functionalization of the aromatic diacetyl monomers. Thus, a range of homo- and copolymers based on hydrogen-, amine-, or nitro-functionalized 4,4'-diacetylbiphenyl derivatives and 1,4-diacetylbenzene was synthesized. The pores size could be tuned from mainly microporous to hierarchical micro- and mesoporous or even hierarchical micro- and macroporous. BET surface areas up to 720 m(2)/g and total pore volumes up to 1.76 cm(3)/g were achieved. The formation of different pore types was related to the solvent-monomer/polymer interactions, which is shown by N-15 solid state MAS NMR spectroscopy and SEM. Other physical properties such as surface polarity and thermal stability were influenced by the different monomers as well.