Molecular recognition of pyrazine <i>N</i>,<i>N</i>′-dioxide using aryl extended calix[4]pyrroles
作者:Chenxing Guo、Hu Wang、Vincent M. Lynch、Xiaofan Ji、Zachariah A. Page、Jonathan L. Sessler
DOI:10.1039/d0sc01496f
日期:——
substituted C4P (receptor 4) and an α,α,α,α-tetraaryl substituted C4P (receptor 5). Single crystal structural analyses of the 2 : 1 host–guest complexes between receptors 1–3 and PZDO revealed that the C4P subunits exist in an unusual partial coneconformation and that the PZDO guest is held within electron-rich cavities formed by the lower rims of the individual C4P macrocycle. In contrast, receptor 5 was seen
Synthesis and crystal structure of 15α,20α-di(4-hydroxylphenyl)calix[4]pyrroles and 10α,20β-di(4-hydroxylphenyl)calix[4]pyrroles
作者:Ying Han、Gen-Liang Wang、Juan-Juan Sun、Jing Sun、Chao-Guo Yan
DOI:10.1016/j.tet.2013.10.036
日期:2013.12
presence of methanesulfonic acid as catalyst, the condensation reactions of 5,5′-dialkyldipyrromethanes with p-hydroxyacetophenone in methanol resulted in a mixture of the unexpected polysubstituted 15α,20α-di(4-hydroxylphenyl)calix[4]pyrroles and the expected 10α,20β-di(4-hydroxylphenyl)calix[4]pyrroles in comparable lower yields. The crystal structures of the new calix[4]pyrroles and their oxyacetate derivatives