Stable Non-fused [22]Pentaphyrins and A Fused [24]Pentaphyrin Displaying Crystal Polymorphism between Hückel and Möbius Structures
作者:Tomoki Yoneda、Tyuji Hoshino、Saburo Neya
DOI:10.1002/asia.201601689
日期:2017.2.16
[22]pentaphyrins 11 and 12 were synthesized by acid‐catalyzed condensation of a meso‐C6F5‐substituted tripyrrane dicarbinol with β‐alkylated dipyrromethanes. These [22]pentaphyrins are stable, allowing their characterization by NMR and UV/Vis spectroscopies, and X‐ray crystallography, and display strong aromaticity due to 22π‐electronic circuits. In methanol, β,β‐diethoxycarbonylated pentaphyrin 12
β-取代的和内-四(五氟苯基)取代的[22]五卟啉11和12是通过内消旋C 6 F 5取代的三吡喃二卡宾醇与β-烷基化的二吡咯甲烷的酸催化缩合反应合成的。这些[22]的五氢卟啉很稳定,可以通过NMR和UV / Vis光谱学以及X射线晶体学对其进行表征,并由于22π电子电路而具有很强的芳香性。在甲醇中,β,β-二乙氧基羰基化的五卟啉12进行N融合反应,得到N稠合的五卟啉13,根据重结晶溶剂的不同,它在Hückel和Möbius结构之间表现出晶体多态性。