Lower-rim mono- and diacylated calix[4]arenes [acyl = C6H5CO, 3,5-(NO2)(2)C6H3CO] undergo selective adamantylation with 3-Y-1-adamantanols (Y = H, i-Pr, 4-MeC6H4) in trifluoroacetic acid at the free phenolic fragments of the macroring. The reaction provides a convenient preparative route to di-, tri-, and tetraadamantylated calix[4]arenes.
sensors. 1,5,6As part of our continued interest in conjugated polymer-based sensors 7 we endeavored to make conductingpolymeric materials containing conformationally rigid metallocalixarene repeat units. In pursuing this system we considered that the communication between the polymer and the calixarene moiety could be mediated via a transition metal center. Calixarenes1a-c were prepared by literature methods
Herein we report on the synthesis and ionophore properties of the first asymmetric p-tert-butylcalix[4]-p-R-thiacalix[4]tubes 7a–c (R = t-Bu, H, 1-adamantyl). The target compounds were obtained by the condensation of tosyloxyethoxy-p-tert-butylcalix[4]arene with the corresponding p-R-thiacalix[4]arenes in the presence of K2CO3 in acetonitrile. The complexation with sodium, potassium and rubidium iodides was studied in CDCl3–CD3OD (4 : 1) medium by means of 1H NMR measurements. It was found that the ionophore properties of calixtubes 7a–c are controlled by the character of the substituents at the upper rim of the thiacalix[4]arene fragment and it was shown that only the molecular tube 7c with an adamantane-containing thiacalixarene unit is capable of quantitatively binding potassium (swiftly) and rubidium (slowly) cations.
在此,我们报告了第一个不对称对叔丁基calix[4]-p-R-thiacalix[4]管7a–c(R = t-Bu,H,1-金刚烷基)的合成和离子载体特性。通过甲苯磺氧基乙氧基-对叔丁基杯[4]芳烃与相应的对-R-硫代杯[4]芳烃在K2CO3存在下在乙腈中缩合得到目标化合物。通过 1 H NMR 测量,在 CDCl3-CD3OD (4:1) 介质中研究了与钠、钾和铷碘化物的络合。结果发现,杯管7a-c的离子载体性质受硫代杯芳烃片段上边缘取代基的特征控制,并且表明只有具有含金刚烷的硫代杯芳烃单元的分子管7c是能够定量结合钾(快速)和铷(缓慢)阳离子。
Calix[4]arene-Based Receptors with Hydrogen-Bonding Groups Immersed into a Large Cavity
A one-pot procedure, which combines the Ritter and Friedel-Crafts reactions, produced the first members of a new type of calix[4]arene-based receptors. The cavity in these receptors is formed by a calix[4]arene framework fixed in the cone conformation and bulky adamantyl or (and) phenylacetylene moieties. Amido and amino groups were used as potential hygrogen bond donors. Preliminary studies revealed interesting complexation properties, in particular, the tetrahedral recognition of water molecules performed by one of the receptors.
Asymmetric calix[4]-thiacalix[4]arene tubes: Synthesis and ionophore properties
作者:E. V. Khomich、M. N. Kashapov、I. M. Vatsuro、E. A. Shokova、B. B. Kovalev
DOI:10.1134/s1070428007020078
日期:2007.2
Asymmetric p-tert-butylcalix[4]-p-R-thiacalix[4]arene tubes (R = tert-Bu, H, 1-adamantyl) were prepared for the first time by reaction of tosyloxyethoxy derivative of p-tert-butylcalix-[4]arene and the corresponding p-R-thiacalix[4]arenas in acetonitrile in the presence of K2CO3. Complex formation of compounds obtained with sodium, potassium, and rubidium iodides in CDCl3-CD3OD, 4:1, was studied by means of H-1 NMR. The ionophore properties of the molecule were governed by the character of substituents on the upper rim of the thiacalixarene fragment, and only the molecular tube containing a fragment of the p-(1-adamantyl)-thiacalix[4]arene quantitatively bound potassium ions (quickly) and rubidium ions (slowly).
Narrow rim CMPO/adamantylcalix[4]arenes for the extraction of lanthanides and actinides
Six p-(1-adamantyl)calix[4]arenes 7, 8 with four differently attached diphenyl-carbamoylmethylphosphine oxide (CMPO) functions at the narrow rim were synthesized. This series was extended by adamantylcalix[4]arenes with two CMPO and two ester, acid or (diethylphosphono)acetylamino groups. Structures of new compounds were proved by NMR, mass-spectrometry and a single-crystal X-ray analysis for the intermediate