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8 results on '"Wolff, Artur"'

1. Diagnóstico e Tratamento de Distúrbios do Sono: Abordagens Atuais e Futuras Perspectivas

Author

Bevilacqua, Giovana Ortega, primary, Wolff, Artur Bosi, additional, Guastaldi, Giovana Pesce, additional, Brito, Gabriele de Lima Gazani, additional, Aguiar, Caylton Carneiro, additional, Colmiran, Isis Ribeiro, additional, Colmiran, Isabela Ribeiro, additional, Lins, Lucas Pereira Rodrigues, additional, Oliveira Júnior, Jair Paes de, additional, Azevedo, José Terso Fernandes de, additional, Oliveira, João Victor Portellinha de, additional, and Cavalcante, Rhuan Sales, additional

Published
2023
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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. Direct synthesis of calix(4)arenes with two different phenolic units in alternating order

Author

Bohmer, Volker, Jung, Kai, Schon, Michael, and Wolff, Artur

Subjects
Aromatic compounds, Phenols -- Research, Substitution reactions -- Methods, Aldehydes -- Research, Electrolysis -- Methods, Halides -- Research, Cathodes -- Research, Biological sciences, Chemistry
Abstract

Direct addition of bis(bromomethyl)phenol to another phenolic unit led to a simplified synthesis of calix(4)arenes. The process was applied in a five-step synthesis of two para-phenylphenol and two para-tert-anisol units of a calix(4)arene derived from tert-butylcalix(4)arene, providing a yield of 27%. The simple five-step process involved compensated the small amount of yield gathered, rendering the process an alternative method for calix(4)arene preparation.

Published
1992

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