Fast Oxidative Cyclooligomerization towards Low- and High-Symmetry Thiophene Macrocycles
作者:Stefan K. Maier、Georgiy Poluektov、Stefan-S. Jester、Heiko M. Möller、Sigurd Höger
DOI:10.1002/chem.201503211
日期:2016.1.22
Macrocycles with quaterthiophene subunits were obtained by cyclooligomerization by direct oxidative coupling of unsubstituted dithiophene moieties. The rings were closed with high selectivity by an α,β′‐connection of the thiophenes as proven by NMR spectroscopy. The reaction of the precursor with terthiophene moieties yielded the symmetric α,α′‐linked macrocycle in low yield together with various differently
通过未取代的二噻吩部分的直接氧化偶合,通过环寡聚反应获得具有四噻吩亚单位的大环。环已通过NMR证明通过噻吩的α,β ′连接而具有高选择性。与三噻吩基部分的前体的反应,得到对称的α,α '具有各种不同地连接的异构体-连接的大环化合物在低产量在一起。半环的β位的阻塞产生了选择性的α,α ' -连接的大环化合物。通过扫描隧道显微镜对选定的环噻吩进行了研究,结果表明形成了高度有序的2D晶体单层。