Dual binding mode of alkylammonium cations to (1,3)-calix[5]crown-6 triesters
作者:Mario Gattuso、Anna Notti、Sebastiano Pappalardo、Melchiorre F Parisi
DOI:10.1016/s0040-4039(98)00107-5
日期:1998.4
Potentially heteroditopic receptors 1c-h are easily obtained by exhaustivealkylation of (1,3)-calix[5]crown-6 triols 1a () or 1b (R′ = H) with alkyl bromoacetates. 1H NMR titration experiments provide clear evidence for a dual (endo-cavity and/or exo-cavity) binding mode of alkylammonium cations to hosts 1c-h, depending on the shape of the guest and the size of substituents at the upper rim.
通过将(1,3)-calix [5] crown-6三醇1a()或1b(R'= H)与溴代乙酸烷基酯进行完全烷基化反应,可以轻松获得潜在的异位受体1c-h。1个1 H NMR滴定实验提供明确的证据用于双(内切-cavity和/或外切-cavity)结合烷基铵阳离子的模式给主机1C-H ,这取决于客户的形状和取代基中的上边缘的大小。
Crown ether derivatives of calix[5]arenes: synthesis and complexation properties
作者:Françoise Arnaud-Neu、Ralf Arnecke、Volker Böhmer、Stefano Fanni、James L. M. Gordon、Marie-José Schwing-Weill、Walter Vogt
DOI:10.1039/p29960001855
日期:——
Several crownetherderivatives of calix[5]- and tert-butylcalix[5]-arene have been synthesized and converted into their trimethyl ethers as neutral ligands. For selected examples extraction studies have been carried out with alkali metal picrates in the system water–dichloromethane and stability constants have been determined by UV spectroscopy in methanol. All ligands show a more or less pronounced
Shape Recognition of Alkylammonium Ions by 1,3-Bridged Calix[5]arene Crown-6 Ethers: <i>E</i><i>ndo</i>- vs <i>E</i><i>xo</i>-Cavity Complexation
作者:Gabriella De Salvo、Giuseppe Gattuso、Anna Notti、Melchiorre F. Parisi、Sebastiano Pappalardo
DOI:10.1021/jo015982k
日期:2002.2.1
calix[5]arene crown-6 ethersbearing alkyl, arylalkyl, alkoxyalkyl, and alkoxycarbonylmethyl residues at the lower rim and either (t)()Bu or H substituents at the upper rim have been synthesized. (1)H NMR studies have shown that p-tert-butylcalix[5]crowns, irrespective of the size and nature of their lower rim pendant groups, adopt preorganized conelike conformations, whereas p-H-calix[5]crowns with bulky substituents