(m-Methylbenzyloxy)-, bis(p-methylbenzyloxy)-, and bis(m-methylbenzyloxy)-p-tert-butylcalix[4]-arenes were prepared by reactions of p-tert-butylcalix[4]arene with p- and m-methylbenzyl bromides in the presence of alkali metal carbonates. Silylation of these derivatives gave (m-methylbenzyloxy)bis(trimethylsilyloxy)-, bis(m-methylbenzyloxy)bis(trimethylsilyloxy)-, and bis(p-methylbenzyloxy)bis(trimethylsilyloxy)-p-tert-butylcalix[4]arenes. With phase-transfer catalysis, bis(p-methylbenzyloxy)bis(2-propenyloxy)- and bis(m-methylbenzyloxy)bis(2-propenyloxy)-p-tert-butylcalix[4]arenes were obtained. Alkylation of the monosubstituted calixarene yields the corresponding trisubstituted derivative.
First Synthesis of Lower-Rim-Substituted Aryl Ethers of <i>p-tert</i>-Butylcalix[4]arene
作者:Sultan Chowdhury、Paris E. Georghiou
DOI:10.1021/jo015622x
日期:2001.9.1
the first lower-rim arylether derivatives of tert-butylcalix[4]arene is reported, as are some of their conformational properties, (1)H NMR spectra, and X-ray crystal structures. The lower-rim aryl pendants reported herein provide for new scaffolds upon which a host of other new molecular architectures can be constructed, thus extending the capability of the versatile calix[4]arenes even further.