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Showing 1 to 7 of 7 for “"Iridium catalyst"”.
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Investigating Rings: From Iridium-Catalyzed [4+2] Cycloadditions of Alkynyl Halides to Ring Openings of Cyclopropanated Oxabenzonorbornadiene
This thesis describes two unrelated projects. Iridium-catalyzed intramolecular [4+2] cycloadditions of alkynyl halides were investigated, and the catalyst conditions were optimized for ligand, solvent, and temperature. Several substrates successfully underwent cycloaddition under the optimized …
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A hydrogen bonding ortho-directing effect for the iridium catalyzed borylation of NH(t-BOC) aromatics
… and others act as steric obstacles for the iridium catalyst to avoid. This avoidance of appending groups can be reversed into a directed borylation with monophosphine ligands. Alternatively, the SiMe2H group elicits an ortho-directing effect via oxidative addition to the metal center. …
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Novel P,N-Ligand Stabilized Transition Metal Complexes as Efficient Catalysts for Organic Syntheses
… for this reaction. P,N-ligand stabilized iridium complexes were readily prepared in quantitative yields and evaluated as potential catalysts for the N-alkylation of amines with alcohols. After optimization of the reaction conditions by systematic variation of important parameters such as …
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The development of directing group enabled hydroamination strategies to access to 1,2-, 1,3-, and 1,4- diamines with high levels of regio-, chemo-, and stereoselectivity
… which we have overcome with careful catalyst selection and a directing group strategy. The synthesis of 1,2-diamines is an efficient manner is an unresolved challenge for organic chemists. The enantioselective synthesis thereof is more challenging yet, and is generally approached …
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Change Of Metal Oxidation State At High Temperature, Impact Of Temperature And Reactive Gases
… catalysis, the use of metal doped heterogeneous catalysts are essential in achieving selectivity and conversion performance for chemical synthesis to emissions abatement. Typically, these metal alloys must withstand temperatures up to 1000 °C at pressures near 30 bar continuously for 8000 hours …
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NOVEL EXPERIMENTAL APPROACHES AND THEORETICAL MODELS FOR IMPROVING SENSITIVITY AND INFORMATION CONTENT OF NMR AND MRI SPECTROSCOPY
… are reported. Moreover, a new water soluble NHC-Iridium catalyst was synthesized and investigated in SABRE related studies. We also report the first studies of SABRE-enhancement in biologically tolerable solvents--opening a door to the development of SABRE-hyperpolarized metabolic contrast agents …
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Making Nuclear Magnetic Hyperpolarization Practical through Storage in Disconnected Eigenstates
… a solution containing the diazirine and an iridium catalyst. Due to the chemical inequivalence of the 15N of the diazirine, hyperpolarization of longitudinal magnetization and singlet character could be observed by transfer to the high field spectrometer. Signal enhancements of over 14,000 …