Unprecedented cyclisations of calix[4]arenes with glycols under the Mitsunobu protocol. Part 1: A new perspective for the synthesis of calixcrowns
作者:Viktor Csokai、Alajos Grün、István Bitter
DOI:10.1016/s0040-4039(03)01077-3
日期:2003.6
Selective ring closures of p-tert-butylthiacalix[4]arene and p-tert-butylcalix[4]arene with oligoethylene glycols were performed under the Mitsunobu protocol using the DEAD/TPP system. The method opens a new perspective for the syntheses of 1,3-calixcrowns.
Cation control on the synthesis of p-t-butylthiacalix[4](bis)crown ethers
作者:Fijs W.B. van Leeuwen、Hans Beijleveld、Huub Kooijman、Anthony L. Spek、Willem Verboom、David N. Reinhoudt
DOI:10.1016/s0040-4039(02)02425-5
日期:2002.12
Bridging of p-t-butylthiacalix[4]arene with ethylene glycol ditosylates gave diametrically bridged thiacalix[4]monocrowns-4 and -5, 1,2-alternate thiacalix[4]biscrowns-4 and -5 and 1,3-alternate thiacalix[4]biscrown-5, dependent on the metal carbonate used. They show excellent extraction ability towards Ag+ cations. (C) 2002 Elsevier Science Ltd. All rights reserved.