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Showing 1 to 10 of 10 for “"allylsilanes"”.
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Investigations of transition state geometry in the intramolecular aldol reaction and the intramolecular reaction of allylsilanes with aldehydes
Investigations into factors which influence the transition state geometry of the aldol reaction are described. Synthesis of two bicyclic model systems designed to study base-catalyzed intramolecular aldol reactions are reported, along with the effects that various metal counterions, solvents, and …
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Part I. Stereochemical Studies on the Addition of Allylsilanes to Aldehydes. Part II. Stereochemical Studies on the Addition of Allylmetal Reagents to Acetals
Systematic investigations have been performed to determine the mechanism and origin of selectivity of the allylmetal-aldehyde reaction. Initial studies were performed to determine the solution structure of Lewis acid-aldehyde complexes. The intramolecular allylmetal-aldehyde reaction was next …
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I. Catalyst development in asymmetric phase transfer catalysis employing QSAR methods II. Computational investigations on the stereochemical course of the addition of allylsilanes to aldehydes
… II, the diastereoselectivity of the addition allylsilanes to aldehydes is investigated using density functional theory. The interaction-distortion/activation-strain model of reactivity is used to rationalize the origin of the selectivity. Consistent with experimental model systems, the …
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Some Reactions of Free Radicals and Grignard Reagents with Organosilicon Compounds
… in the literature concerning the reactivity of allylsilanes in radical addition reactions. The reactions of allylsilanes with radical addition reagents have been reexamined and contrary to a previous report it has been found that both carbon tetrachloride and n-butyraldehyde add readily to …
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New Approaches Towards the Asymmetric Allylation of the Formyl and Imino Groups via Strained Silane Lewis Acids
… allylation of aldehydes with achiral strained allylsilanes.
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Exploiting imidate ligand effects in transition metal-mediated C-C bond forming processes
… of propargyl alcohols and allylsilanes. [AuBr2(N-tfs)(ItPe)] was found to be an effective precatalyst for this reaction whilst Au(III) tribromide and Au(I) complexes were ineffective. 1,3-Diarylbicyclo[3.1.0]hexenes products were found to undergo a post-reaction ambient …
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Intramolecular Anodic Olefin Coupling Reactions: Synthesis Of Nitrogen- And Oxygen-Heterocycles
… vinyl sulfides, ketene dithioacetals, and allylsilanes, are compatible with the cyclizations affording proline and pipecolic acid derivatives in good to excellent yields and diastereoselectivity. The mechanism of the reactions under the basic reaction conditions was investigated using …
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Regio- und stereoselektive Synthese von Sesquiterpenen und hormonell aktiven Cholesterinderivaten
In der vorliegenden Arbeit wird die Anwendung der Lewis-Säure vermittelten Cycloadditionen von Allylsilanen an alpha,beta-ungesättigte Carbonylverbindungen beschrieben. Das Sesquiterpen Isocomen wurde unter Anwendung der [3+2]-Cycloaddition an Enone synthetisch hergestellt. Die [2+2]-Cycloaddition …