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Your search keyword '"Electrophiles -- Research"' showing total 4 results
Start Over Descriptor "Electrophiles -- Research" Topic nuclear magnetic resonance spectroscopy -- technology application
4 results on '"Electrophiles -- Research"'

1. Electrophilicity of 5-benzylidene-1,3-dimethylbarbituric and -thiobarbituric acids

Author

Seeliger, Florian, Berger, Stefan T.A., Remennikov, Grygoriy Y., Polborn, Kurt, and Mayr, Herbert

Subjects
Electrophiles -- Research, Nitriles -- Chemical properties, Nuclear magnetic resonance spectroscopy -- Technology application, Technology application, Biological sciences, Chemistry
Abstract

The kinetics of reactions of acceptor-stabilized carbanions with benzylidenebarbituric and -thiobarbituric acids, are determined in a dimethyl sulfoxide solution and the electrophilicity parameters are determined by using second-order rate constants. The studies have shown that the electrophilicities of these acids are comparable to those of analogously substituted benzylidenemalononitriles.

Published
2007

2. Evidence of reversibility in azo-coupling reactions between 1,3,5-tris(N,N-dialkylamino)benzenes and arenediazonium salts

Author

Boga, Carla, Del Vecchio, Erminia, Forlani, Luciano, and Tozzi, Silvia

Subjects
Benzene -- Chemical properties, Diazo compounds -- Chemical properties, Electrophiles -- Research, Nuclear magnetic resonance spectroscopy -- Technology application, Technology application, Biological sciences, Chemistry
Abstract

The reactions between strongly electron-rich aromatic substrates (1,3,5-tris(N,N-dialkylamino)benzenes, neutral carbon super nucleophiles) and diazonium salts have produced moderately stable [sigma] complexes. The final products of the double diazo-coupling reactions have provided evidence that is a clear instance of complete reversibility of the diazo-coupling reaction.

Published
2007

3. Electrophilic chemistry of thia-PAHs: stable carbocations (NMR and DFT), S-alkylated onium salts, model electrophilic substitutions (Nitration and bromination), and mutagenicity assay

Author

Laali, Kenneth K., Joong-Hyun Chun, Okazaki, Takao, Kumar, Subodh, Borosky, Gabriela L., and Swartz, Carol

Subjects
Alkylation -- Research, Density functionals -- Usage, Electrophiles -- Research, Nuclear magnetic resonance spectroscopy -- Technology application, Substitution reactions -- Research, Technology application, Biological sciences, Chemistry
Abstract

The multifaceted studies to develop the electrophilic chemistry of thia-PAHs are reported. The process is applied to generate a series of carbocations from four-ring-fused thia-PAHs and their regioisomeric methoxy derivatives.

Published
2007

4. Bronsted acid-catalyzed desymmetrization of meso-aziridines

Author

Rowland, Emily B., Rowland, Gerald B., Rivera-Otero, Edwin, and Antilla, Jon C.

Subjects
Catalysis -- Research, Cyclic compounds -- Research, Electrophiles -- Research, Nuclear magnetic resonance spectroscopy -- Technology application, Technology application, Chemistry
Abstract

The preliminary studies related to reactions of Bronsted acid-catalyzed enantioselective ring-opening of meso-aziridines is reported. The organocatalytic desymmetrization of meso-aziridines indicates the requirement of trimethylsilyl group for formation of the ring-opened product.

Published
2007

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