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Showing 1 to 20 of 1482 for “"Catalyzed"”.
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Metal-catalyzed reactions.
… hydroboration of olefins and in nucleophilecatalyzed reactions. Indenylrhodium(olefin)2 (and other Cp-derived rhodium complexes) were utilized in the directed hydroboration reactions. Both iron and ruthenium complexes with n-bound heterocyclic ligands were utilized in the study of …
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Homogeneous Cobalt Catalyzed Oxidations
Mechanistic studies of the oxidation of various substituted phenols to benzoquinones by Co(II) bis(salicylidene-(gamma)-iminopropyl)-methylamine, CoSalMDPT are described in Chapter I. The reaction is first order in {O(,2)}, {substrate}, and {Co}. A series of experiments are reported to provide …
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Copper-catalyzed conjugate reduction
Chapter 1. A highly enantioselective catalyst for the asymmetric conjugate reduction of a,- unsaturated cyclic ketones was generated upon combination of catalytic amounts of CuCl, NaOt-Bu, and a chiral bis-phosphine with poly(methylhydrosiloxane) (PMHS) as the stoichiometric reductant. In this …
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Ribosome-catalyzed ester formation.
Massachusetts Institute of Technology. Dept. of Biology. Thesis. 1970. Ph.D.
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Enantioselective nucleophile-catalyzed cycloadditions
… the development of an asymmetric nucleophile-catalyzed [2+2] cycloaddition of ketenes with aldehydes. This is the first report of a catalytic enantioselective synthesis of trisubstituted [beta]-lactones. Two enantioselective phosphine-catalyzed [3+2] cycloadditions of allenoates are detailed …
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Rhodium-Catalyzed Enantioselective Desymmetrizations of Oxabicyclic Alkenes and Alkene Difunctionalization via Nickel-Catalyzed Arylcyanation
… thesis describes the development of a nickel-catalyzed arylcyanation reaction for the synthesis of 3,3-disubstituted oxindoles. This method was inspired by our work on the palladium-catalyzed arylcyanation reaction, originally developed to address challenges in the formal synthesis of …
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Ketone -Catalyzed Epoxidation of Alkenes With Oxone and Palladium -Catalyzed Biaryl Synthesis via Silacyclobutanes
Aryl(fluoro)silacyclobutanes and aryl(chloro)silacyclobutanes have been found to undergo cross-coupling reactions with aryl iodides. The rate of reaction and extent of homocoupling were dramatically affected by the addition of ligands for the palladium catalyst. A wide range of electronically …
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Rhodium-Catalyzed Asymmetric Ring Opening of Oxabicyclic Alkenes and Palladium-Catalyzed Carbon-Halogen Bond Forming Reactions
… the Lautens group involves the transition metal catalyzed asymmetric ring opening (ARO) of strained alkenes, which provides access to enantioenriched carbocyclic frameworks. Although a variety of coupling partners have been applied in this transformation, the use of soft carbon nucleophiles …
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Nickel-catalyzed asymmetric cross-couplings of secondary alkyl electrophiles and photoinduced, copper-catalyzed C-N couplings
… 1 describes the development of three nickel-catalyzed asymmetric Negishi cross-couplings of secondary alkyl electrophiles via a stereoconvergent process. In Section 1.1, asymmetric Negishi arylations and alkenylations of [alpha]-bromonitriles with arylzinc and alkenylzinc reagents are …
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Ruthenium Hydride Catalyzed Silylvinylation of Alkynes
<p>The intermolecular ruthenium hydride catalyzed coupling of internal alkynes with subsequent insertion of olefin acceptors is described. This approach utilizes a vinyl silicon tether to provide complete regiocontrol, a stereoselective anti-exo-dig cyclization which affords a tetrasubstituted …
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Palladium-catalyzed PMHS reductions of imines
We explored the Pd-catalyzed reductions of imines using polymethylhydrosiloxane (PMHS) in the presence of aqueous KF. This methodology developed by our group facilitates the reduction of nitrogen-containing functional groups under mild conditions and short reactions times. To the best of our …
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Selenium redox-catalyzed alkene syn-difunctionalization
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-08-01
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Manganese-catalyzed carbonylation of alkyl iodides
The palladium-catalyzed cross-coupling of aryl bromides with zirconocene-benzyne complexes has been investigated by S.L. Buchwald and coworkers. This method allows the formation of substituted biphenyls and terphenyls, however only two ortho-substituents are tolerated in this transformation. The …
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Restoring and enhancing Argonaute2-catalyzed cleavage
… in zebrafish at least partly because Argonaute2-catalyzed mRNA slicing is impaired. This defect can be traced to two conserved mutations that arose in an ancestor of most teleost fish almost 300 million years ago, implying that most fish lack effective RNAi. Despite lacking efficient slicing …
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DEVELOPMENT OF METAL-CATALYZED REACTIONS OF ALLENES WITH IMINES AND THE INVESTIGATION OF BRΘNSTED ACID CATALYZED ENE REACTIONS
… well as substrates for drug targets. Lewis acid catalyzed ene reactions provide access to homoallylic amines and alcohols. However, the scope of this type of catalysis is limited because of the need for inert conditions, the metal waste generated, and the metal’s stronger chelation to the product …
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