Intermolecular n→π* Interactions Based on a Tailored Multicarbonyl‐Containing Macrocycle
作者:Jun Zhu、Xu‐Dong Wang、Yu‐Fei Ao、Qi‐Qiang Wang、De‐Xian Wang
DOI:10.1002/chem.202203485
日期:2023.2.24
The unprecedent intermolecular n→π* interactions with a designer multicarbonyl-containing macrocycle were revealed. The integrated cooperative C=O⋅⋅⋅C=O interactions can drive self-assembly formation of functional nanotubes as demonstrated allowing for single-crystal chromatography separation of moving dyes.
作者:Paritosh R. Dave、Gerald Doyle、Theodore Axenrod、Hamid Yazdekhasti、Herman L. Ammon
DOI:10.1021/jo00126a054
日期:1995.10
The reaction of 1,3- and 1,4-bis(bromomethyl)benzenes with 5-tert-butyltetrahydro-1,3,5-triazin-2(1H)-n-one (1) and 2-imidazolidone (2) has been used to synthesize a series of 16- and 18-membered ring calixarene analogs which incorporate cyclic urea units. The structures and conformations of these novel macrocyclic ring systems have been investigated in the solid state by X-ray crystallography and in solution by various NMR methods. The results indicate important conformational equilibria dominated by species having syn and anti alignments of the urea carbonyl groups and that interconversion of these conformers likely occurs by carbonyl through the annulus rotation. AM1 semiempirical molecular orbital geometry optimizations are consistent with these findings.