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Showing 1 to 20 of 31 for “"Sulfoxides"”.
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Capillary Electrophoretic Separation of Sulfoxides
Chiral sulfoxides are most widely used in asymmetric synthesis. Their application as chiral synthons has now become a well-established and reliable strategy, mainly due to availability and high asymmetric induction exerted by the chiral sulfinyl group. Very few articles have been published on the …
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Selected reactions of some cyclic sulfoxides
… sulfides. The structure of these unsymmetric sulfoxides was established by chemical and physical methods. Nuclear magnetic resonance analyses have provided significant information concerning some stereochemical aspects of these molecules. In the case of <u>1</u>. which has four possible …
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Diastereomeric Interactions of Sulfoxides, Lactones and Aryl Trifluoromethyl Carbinols
Made available in DSpace on 2014-12-13T20:10:02Z (GMT). No. of bitstreams: 1 7709188.pdf: 3101030 bytes, checksum: 861440f74c5e31ae7326a4ba5123666b (MD5) Previous issue date: 1976
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Photochemical and computational study of sulfoxides, sulfenic esters, and sulfinyl radicals
<p>Despite a fairly long history of research, sulfoxide photochemistry has not been extensively developed. This is particularly true in terms of structural effects on the observed sulfoxide photochemistry. Because of this, our group has embarked on an extensive study to gain a better understanding …
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1. Neighboring group participation in some sulfides and sulfoxides. 2. Nuclear magnetic resonance studies of diazirines
Made available in DSpace on 2014-12-09T17:34:59Z (GMT). No. of bitstreams: 1 6500931.pdf: 7504343 bytes, checksum: c4c2969d6fafd613bfead3ffdef229a1 (MD5) Previous issue date: 1964
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Enantioselective Adsorption of 1,3-Dithiolane-1-Oxides and Related Compounds on Liquid Chromatographic Amino Acid-Derived Chiral Stationary Phases (Resolution, Enantiomers, Sulfoxides)
… of the absolute configuration of many cyclic sulfoxides on the basis of chromatographic elution order. Confirmation of these assignments is provided by circular dichroism spectroscopy, NMR spectroscopy in the presence of a chiral solvating agent and preparation of chiral sulfoxides from …
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Stabilization of electron-deficient sulfur by neighboring sulfur and oxygen groups.
… led to the formation of two diastereomeric sulfoxides in a two electron process. The diastereomer ratio was suggestive of participation by the carboxylate in the oxidation. The structures of the sulfoxides were confirmed by comparison with chemically prepared sulfoxides and sulfoxide amino …
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Comparative Study of the Effects of Physical and Chemical Aging on Extracted and Recovered Asphalt Binders from Some Municipal and Provincial Roads in Canada
… used to determine the presence of carbonyls, sulfoxides, zinc and molybdenum which result from chemical oxidation and the addition of recycled engine oil bottoms (REOB). The significant amount of zinc and molybdenum found in all the samples could be a result of addition of REOB, which is known …
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Methodology for the syntheses of pharmaceutically significant functional groups
… nitrogen-fluorine halogen bond, the synthesis of sulfoxides and sulfenamides from highly reactive and unstable chloramine in continuous-flow, and partial translation of the process route to enantiopure (S)-naproxen from batch chemistry to continuous-flow.
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Selective Oxidations by Metalloporphyrins and Metallocorroles
… oxygen source efficiently catalyzed sulfides to sulfoxides under mild conditions. Ruthenium porphyrins (2) catalyzed the highly selective oxidation of para-substituted thioanisoles and allylic sulfides with PhI(OAc)<sub>2</sub> in the presence of visible light. Over 95% conversion and 100% …
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Study of the application of the high performance liquid chromatography-particle beam interface-mass spectrometry technique on some pesiticides and the reduction phenomena in the system
… system, included in them are: quinones, sulfoxides, and sulfones.
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The synthesis and characterization of new sulfoxide complexes of ruthenium and their potential as anti-cancer agents
… Four ruthenium (II) complexes of chelating sulfoxides are also synthesized and structurally characterized. The data for the complexes trans-RuCl₂(BMSE)₂ (4), cis-RuCl₂(BESE)₂ (5), trans-RuCl₂(BPSE)₂ (6) and cis-RuCl₂(BMSP)₂ (7) reveal in each case only S-bonded sulfoxides. The unit cell of …
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Synthesis and reactivity of α-diazosulfoxides and α-diazosulfones
… the synthesis of stable mono and bicyclic α-diazosulfoxides and their subsequent reactivity. A range of α-diazosulfoxides have been synthesised by the Maguire-Collins research group since the mid-1990s using a Regitz diazo transfer method. In this work in situ NMR monitoring has been used to gain …
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The Separation of the Polar Constituents of Petroleum
… and other oxygen-containing species; carbazoles; sulfoxides; and thiophenes, to be isolated reproducibly and quantitatively from relatively small crude oil samples (~ 0.5 g). Assessment of method selectivity with a suite of ‘model’ compounds showed that the resulting fractions were quite well …
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