Synthesis and properties of novel amphiphilic calix-[4]-arene derivatives
作者:Patrick Shahgaldian、Anthony W Coleman、Vitaly I Kalchenko
DOI:10.1016/s0040-4039(00)02003-7
日期:2001.1
A series of amphiphilic calix-[4]-arenes having four hydrophobic acyl chains (C6 C12) at the macrocyclic upper rim as well as two hydrophilic dihydroxyphosphoryloxy groups at the lower rim and analogous to the diacylphosphatidic acids lipids have been synthesised and characterised. The synthesis proceeds via regioselective 1.3 lower phosphorylation of the tetra-acyl calix-[4]-arene by diethylchlorophosphate in the presence of triethylamine. The ethyl groups are removed by consecutive treatment with trimethylbromosilane and methanol. All the new amphiphilic derivatives self-assemble at the air-water interface as stable Langmuir monolayers. (C) 2001 Published by Elsevier Science Ltd.
SHINKAI, SEIJI;NAGASAKI, TAKESHI;IWAMOTO, KOJI;IKEDA, ATSUSHI;HE, G. -X.;+, BULL. CHEM. SOC. JAP., 64,(1991) N, C. 381-386
作者:SHINKAI, SEIJI、NAGASAKI, TAKESHI、IWAMOTO, KOJI、IKEDA, ATSUSHI、HE, G. -X.、+
DOI:——
日期:——
New Syntheses and Physical Properties of<i>p</i>-Alkylcalix[<i>n</i>]arenes
Calix[n]arenes (n=4, 6, and 8) bearing long p-alkyl groups (R=hexyl and dodecyl) have been synthesized by “direct” acylation of the p-position followed by silane reduction. The method is convenient and the yields are higher than those reported so far. Among them, p-hexanoylcalix[4]arene showed a curious phase transition behavior; with raising the temperature it changed as crystal A→liquid→crystal B→liquid. It was found on the basis of the solid 13CNMR spectra that this behavior is ascribed to a conformational change from “cone” (crystal A) to “partial cone” (crystal B).