The three conformations of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis[(benzoyl)methoxy]-2,8,14, 20-tetrathiacalix[4]arene 1: cone, partial cone and 1,3-alternate, were prepared by the treatment of 5,11,17,23-tetra-tert-butyl-2,8,14,20-tetrathiacalix[4]arene-25,26,27,28- tetraol (TCA) with α-bromo acetophenone in the presence of appropriate alkali carbonate M2CO3 (M=Na, K, Cs) as base catalyst in acetonitrile. Structure of the conformers were established by 1H NMR, 1H-1H COSY, 1D NOE, 2D ROESY and X-ray experiments. The alkali cation binding selectivity of the obtained macrocycles was investigated by the ion-pair extraction method. © 2003 Elsevier Science Ltd. All rights reserved
<div><p>A series of thiacalix[4]arenes bearing one, two or four chelating dibutylphopshinoylmethoxy ...
p-tert-Butylthiacalix[4]arene tetrathioesters 2a-c and tetrathioamides 4a-c in three different confo...
The preparation of partially substituted thiacalix[4]arenes 2-6 has been accomplished by conducting ...
The three conformations of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis[(benzoyl)methoxy]-2,8,14...
The interaction of p-tert-butylthiacalix[4]arene with N,N- diethylchloroacetamide was studied in the...
The synthesis of four new tetra-and di-carbonyl p-tert-butyl thiacalix[4]arenes is reported. The thr...
Synthesis of ω-bromoalkoxy derivatives of thiacalix-monocrown ethers in 1,3-alternate conformation w...
Reaction of thiacalixarenes with propargyl bromide in the presence of potassium or cesium carbonates...
© ISUCT Publishing.New tetrasubstituted at the lower rim thiacalix[4]arenes containing both (ethoxyc...
Template effect of alkali metal ions was employed to prepare three isomers of tetraamide of p-tert-b...
<div><p>A series of thiacalix[4]arenes bearing one, two or four chelating dibutylphopshinoylmethoxy ...
p-tert-Butylthiacalix[4]arene tetrathioesters 2a-c and tetrathioamides 4a-c in three different confo...
The preparation of partially substituted thiacalix[4]arenes 2-6 has been accomplished by conducting ...
The three conformations of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis[(benzoyl)methoxy]-2,8,14...
The interaction of p-tert-butylthiacalix[4]arene with N,N- diethylchloroacetamide was studied in the...
The synthesis of four new tetra-and di-carbonyl p-tert-butyl thiacalix[4]arenes is reported. The thr...
Synthesis of ω-bromoalkoxy derivatives of thiacalix-monocrown ethers in 1,3-alternate conformation w...
Reaction of thiacalixarenes with propargyl bromide in the presence of potassium or cesium carbonates...
© ISUCT Publishing.New tetrasubstituted at the lower rim thiacalix[4]arenes containing both (ethoxyc...
Template effect of alkali metal ions was employed to prepare three isomers of tetraamide of p-tert-b...
<div><p>A series of thiacalix[4]arenes bearing one, two or four chelating dibutylphopshinoylmethoxy ...
p-tert-Butylthiacalix[4]arene tetrathioesters 2a-c and tetrathioamides 4a-c in three different confo...
The preparation of partially substituted thiacalix[4]arenes 2-6 has been accomplished by conducting ...