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2. Dissymmetric calix(4)arenes with C(sub 4)- and C(sub 2)-symmetry: synthesis, X-ray structures, conformational fixation, and 1H NMR spectroscopic studies

Author

Andreetti, Giovanni D., Bohmer, Volker, Jordon, J. Graham, Tabatabai, Moniralsadat, Ugozzoli, Franco, Vogt, Walter, and Wolff, Artur

Subjects
Aromatic compounds -- Research, Nuclear magnetic resonance spectroscopy -- Usage, Spectrum analysis -- Usage, Biological sciences, Chemistry
Abstract

The condensation of the associated 2- or 6-hydroxymethylated phenols yielded six dissymmetric calix (4) arenes with C4 symmetry containing four 3,4-disubstituted phenolic units. The p-methylcalix (4) arene possesses a higher energy barrier than calixarene 4a, which contains 3,4-dimethylphenol units for the gene-to-gene inversion in CDCl3. The alkylation of the phenolic hydroxyl group is used to structurally set the dissymmetric calixarenes 4. In addition to tetra derivatives, mono-acid 1, 3-di-derivatives could be used, because of the equivalence of all four phenolic units.

Published
1993

3. The cone-to-cone interconversion of partially O-methylated calix(4)arenes: first experimental values for the energy barriers

Author

Kusano, Toshiya, Tabatabai, Moniralsadat, Okamoto, Yoshio, and Bohmer, Volker

Subjects
Methylation -- Research, Aromatic compounds -- Research, Conformational analysis -- Research, Chemistry
Abstract

Research was conducted to determine the activation parameters for the conformational interconversion of partially O-methylated calix(4)arenes using an experimental procedure. Calix(4)arenes composed of meta-substituted phenols are chiral in their cone conformation and their cone -> cone inversion converts one enantiomer into its mirror image. The investigation of the thermal racemization by measuring rate constants as a function of temperature enables the determination of the energy barriers for the chiral partial methyl ethers.

Published
1999

10. Selective monohydrolysis of bridged and unbridged calix[4]arene esters and its inhibition by alkali ion. Evidence for hydronium ion complexation

Author

Barrett, Geraldine, primary, Bohmer, Volker, additional, Ferguson, George, additional, Gallagher, John F., additional, Harris, Stephen J., additional, Leonard, Raymond G., additional, McKervey, M. Anthony, additional, Owens, Michael, additional, Tabatabai, Moniralsadat, additional, Vierengel, Anita, additional, and Vogt, Walter, additional

Published
1992
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