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Your search keyword '"Valdes, A."' showing total 259 results
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259 results on '"Valdes, A."'

1. ChemInform Abstract: Chemoselective Intramolecular Functionalization of Methyl Groups in Nonconstrained Molecules Promoted by N-Iodosulfonamides

Author

Haydee Valdes, Concepción C. González, Daniel Melián, Ricardo Marticorena, Antonio J. Herrera, M. Belen Copano, Dionisio Rodriguez‐Sosa, and Nieves R. Paz

Subjects
chemistry.chemical_compound, chemistry, Intramolecular force, Molecule, Halogenation, Surface modification, General Medicine, Medicinal chemistry, Pyrrole derivatives, Pyrrolidine
Abstract

Conditions A) and B) are elaborated as optimal for the preparation of pyrrolidine or 2-pyrrolidonone structures via radical-mediated methyl iodination/oxidative deiodination.

Published
2015
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2. ChemInform Abstract: Synthetic and Mechanistic Aspects of the Regioselective Base-Mediated Reaction of Perfluoroalkyl- and Perfluoroarylsilanes with Heterocyclic N-Oxides

Author

Martin Valdes, David E. Stephens, Hadi D. Arman, Monica Dovalina, Gabriel Chavez, and Oleg V. Larionov

Subjects
Heterocyclic N-Oxides, Chemistry, Regioselectivity, General Medicine, Base (exponentiation), Combinatorial chemistry
Abstract

The synthetic utility of a reaction of heterocyclic N-oxides and perfluoroalkylsilanes that affords 2-perfluoroalkyl/aryl-substituted nitrogenous heterocycles in good to excellent yields is reported.

Published
2014
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13. ChemInform Abstract: On-Demand Electrochemical Generation of Arsine

Author

J. L. Valdes, Gardy Cadet, and J. W. Mitchell

Subjects
Hydrogen, Analytical chemistry, chemistry.chemical_element, General Medicine, Electrochemistry, Mass spectrometry, Volumetric flow rate, Metal, chemistry.chemical_compound, Arsine, chemistry, visual_art, visual_art.visual_art_medium, Calibration, Arsenic
Abstract

An experimental investigation was conducted on the electrochemical generation of arsine from high purity (99.9999%), vapor-deposited arsenic metal in alkaline solutions. A novel method using high-sensitivity mass spectrometry (MS) coupled to an electrochemical hydrogen calibration (MS-HC) cell was employed for quantitative analysis of gaseous products. A scheme is presented for an on-demand electrochemical generator system that can provide high-purity arsine over a wide range of concentrations and flow rates to meet the requirements for practical electronic processing applications

Published
2010
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16. ChemInform Abstract: Salvinorin C, a New Neoclerodane Diterpene from a Bioactive Fraction of the Hallucinogenic Mexican Mint Salvia divinorum

Author

Leander J. Valdes, Daniel C. Visger, Hui-Ming Chang, and Masato Koreeda

Subjects
Hallucinogen, biology, Fraction (chemistry), General Medicine, Salvinorin C, biology.organism_classification, Nmr data, Salvinorin A, Terpene, chemistry.chemical_compound, chemistry, Salvia divinorum, Organic chemistry, Diterpene
Abstract

Salvinorin C (1), a minor component from a biologically active TLC fraction, was isolated from the leaves of the Mexican mint Salvia divinorum. Its structure was elucidated on the basis of extensive proton and C-13 NMR experiments, as well as by comparison of the NMR data with those of the mono- and diacetate derivatives 5−7 of the major NaBH4-reduction product of salvinorin A (2).

Published
2010
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