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Showing 1 to 19 of 19 for “"Terminal Olefins"”.
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Oxidative Heck Reactions with Terminal Olefins
… used to generate branched allylic esters from α-olefins with only the addition of an aryl boronic acid to the reaction mixture. Styrenyl allylic esters are generated in good overall yield and excellent selectivities. The wide functional group tolerance and mild conditions of this three-component …
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I. Biomimetic oxidations using non-heme iron catalysis. II. Palladium- and hypervalent iodine-catalyzed tandem wacker-dehydrogenation of terminal olefins
… highly selective oxidation reactions of alkanes, olefins, and arenes. Inspired by this diversity of reactivity, the chemical community has long sought to replicate enzymatic reactivity within the synthetic laboratory, both for the purposes of better understanding enzymatic reaction mechanisms and …
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New Strategies for the Synthesis of Amines, Ethers and Small Strained Rings
… ethers with primary alkyl Grignard reagents or terminal olefins. A significant development in this project is related to the purification and handling of the sensitive and basic NH-azetidine compounds. Oxime ether coupling with structurally and electronically diverse primary Grignard reagents …
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Design and Synthesis of Cellulose Ether Derivatives for Oral Drug Delivery
… esters and reacting with electron-deficient olefins like acrylic acid. Cellulose ethers have much better hydrolytic stability compared to esters and are also commercially very important. The overarching theme of this dissertation is to investigate modification of cellulose ether derivatives, …
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Mechanistic Studies of Rhodium Oxidation Catalysts
… catalytic processes for the O(,2) oxidation of terminal olefins have been proposed to proceed through non-free radical, non-Wacker mechanisms involving the coordination of O(,2) and olefin to a rhodium(I) catalyst. One particularly promising system is the Rh/Cu co-catalyzed O(,2) oxidation of …
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Materials with supramolecular chirality : liqid crystals and polymers for catalysis
… Two and Three describe the incorporation of terminal olefins as polymerizable groups within a columnar liquid crystalline template as an effective method for the synthesis of robust, anisotropic polymeric materials. Upon in situ acyclic diene metathesis (ADMET) polymerization, the original …
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Asymmetric allylic C–H functionalization via palladium(II)/sulfoxide-oxazoline catalysis
… asymmetric allylic C–H functionalization of terminal olefins through the intermediacy of π-allyl/Pd(II) complex represents a viable platform. Traditionally, the asymmetric functionalization of π-allyl/Pd(II) intermediate generally proceeded with phosphine-based ligands, under redox-neutral …
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Transition metal-catalyzed olefin functionalization for highly regio-, enantio-, and chemoselective C–X bond formation
… anti-Markovnikov oxidative amination reaction of terminal olefins with pendent aryl- or alcohol functionality is presented. Alkenes are shown to react with imides in the presence of a palladate catalyst to afford the terminally aminated product. Following an anti-Markovnikov selective …
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Structure-function relationships of copper and molybdenum complexes
… 2023, capable of Z-2 selective isomerization of terminal olefins. Both required acid additives to initiate the isomerization reaction and were not widely tolerant of functionalized substates. While other research groups have reported catalysts capable of Z- selective isomerization- there are …
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Improving synthetic efficiency through C—H activation
… system for asymmetric allylic C—H oxidation of terminal olefins. Evidence is provided that supports a model in which a chiral Lewis acid co-catalyst interacts with an organometallic intermediate and influences the stereochemical course of the catalytic process. Additionally, this work …
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Molybdenum and tungsen alkylidene species for catalytic Enantio-, Z-, and E-selective olefin metathesis reactions
… that are Z selective for the homocoupling of terminal olefins can be employed for the selective ethenolysis of Z internal olefins in the presence of E internal olefins in minutes at 22 0C. Therefore it is possible to take an E:Z mixture to a pure E product by selectively destroying the Z …
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High-oxidation-state molybdenum and tungsten monoalkoxide pyrrolide alkylidenes as catalysts for olefin metathesis
… perform non-stereoselective metathesis of terminal olefins, and W(NAr)(CHCMe₂Ph)(pyr)(OHIPT-NMe₂) can be washed off the surface with polar solvent and perform solution-phase Z-selective metathesis. Chapter 2 details selective metathesis homocoupling of 1,3-dienes with Mo and W monoalkoxide …
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Synthesis and Characterization of Ruthenium (II) Complexes and their Applications to Atom Transfer Radical Addition Reactions
… for the addition of CCl4 to more challenging ii olefins. Both terminal and internal olefins were utilized for the addition reactions. All the three complexes exhibited high reactivity towards CCl4 addition to terminal olefins. Total turnovers (TTO) in excess of 80,000 were obtained for the …
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C—H oxidation reactions in complex molecule synthesis: application and development
… Diels-Alder reaction that converts simple terminal olefins into complex cyclohexenyl adducts in good yields and selectivities. Based on the high functional group tolerance, this method enables expedient access to a wide variety of biologically and medicinally relevant heterocycles, such as …
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New frontiers in allylic C––H amination via palladium/sulfoxideoxazoline catalysis
Direct allylic C––H functionalization of terminal olefin represents an orthogonal approach to traditional methods to build C––O, C––N and C—C bond due to less oxidation state manipulation and synthetic overhead. In particular, site, chemo- and stereoselective methods for Pd(II)-catalyzed allylic …
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The evolution of molybdenum and tungsten olefin metathesis catalysts
… diffraction. The initial reactivity with simple olefins employing many of these new alkylidenes was explored. Chapter 2: Two diastereomers of the MAP (monoaryloxidepyrrolide) species, W(NAr)(CH2)(Me2Pyr)(OBitetBr2) (OBitetBr2 = (R)-3,3'-dibromo-2'-(tertbutyldimethylsilyloxy)- …
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The catalytic hydrogenation of carbon-carbon and carbon-nitrogen multiple bonds by a cobalt(I) complex
… was also investigated. The hydrogenation of terminal olefins proceeded selectivity at room temperature, while more sterically demanding 1,2-disubstitued olefins proceeded at elevated temperatures. Mechanistic studies based on multinuclear and parahydrogen (p-H2) induced polarization (PHIP) …
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Expanding the scope of allylic C—H aminations via electrophilic palladium(II) catalysis
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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Synthetic investigations of molybdenum pyrrolide and related complexes
… ligands, 1 and 2 react productively with olefins. 1 and 2 react with alcohols to give previously characterized bisalkoxide olefin metathesis catalysts. Reaction of Li(3,5-R 2-pyrazolide) (R = t- Bu or Ph, R2pz) with Mo(NAr)(CHCMe 2Ph)(OTf) 2(DME) yields Mo(NAr)(CHCMe 2Ph)(3,5- R2pz)2 (R = …