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Showing 1 to 20 of 319 for “"olefin"”.
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Darstellung langkettiger Monosaccharide mittels Olefin-Metathese-Reaktion
… Ringschluss vollzogen wurde. Das so entstandene Olefin konnte durch Osmylierung dihydroxyliert werden, wobei gleichzeitig die Silylether-Klammer entfernt wurde, so dass man zum gewünschten Endprodukt gelangte. Alternativ zu diesem Schritt wurde zunächst die Klammer selektiv entfernt und dann die …
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A mechanistic study of the olefin metathesis reaction
Thesis (M.S.)--Michigan State University. Dept. of Chemistry, 1972
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Synthesis and Chemistry of an Unusual Bridgehead Olefin
The bridgehead olefin I was synthesized and a number of itsreactions studied. The olefin is unique in that it possesses acyclopropyl ring oriented in such a way that one edge of the ringfaces directly into the back side of the double bond.
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The 'Indenyl Effect' in iridium(I) olefin complexes
"The complexes CpIr($\eta\sp2$-C$\sb8$H$\sb{14}$)CO and ($\eta\sp5$-C$\sb9$H$\sb7$)Ir($\eta\sp2$-C$\sb8$H$\sb{14}$)CO were prepared in high yield from (($\eta\sp2$-C$\sb8$H$\sb{14}$)$\sb2$Ir(CO)Cl) $\sb2$ and thallium cyclopentadienide or potassium indenide, respectively. The stereoisomers of …
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Mechanisms and catalyst design for heterogeneous Olefin metathesis
Olefin metathesis offers a promising technology for on-purpose production of propylene and has been implemented in several industrial processes including the Lummus Olefin Conversion Technology. However, current metathesis technology cannot produce propylene cheaply and efficiently due to reliance …
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Synthesis of molybdenum olefin metatheses catalysts through protonation reactions
The attempted syntheses of molybdenum imido alkylidene complexes of the type Mo(NArc,)(CH-t-Bu)[Biphen] and Mo(N-2-CF3C6H4)(CHCMe2Ph)[Biphen] (Biphen2 = 3,3'-di-t-butyl-5,5',6,6'-tetramethyl- 1,1'-biphenyl-2,2'-diolate) from Mo(NArcl)(CH-t-Bu)(OTf)2(dme) and [Biphen]K2 have sporadically afforded …
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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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Applications of Cobaloxime/Photoredox Co-operative Catalysis Toward Olefin Functionalization
… cobaloxime/photoredox co-operative catalysis for olefin functionalization reactions is described. The primary focus has been to devise strategies that allow for the chemoselective cross-coupling of olefins with a variety of versatile functional groups toward the synthesis of synthetically valuable …
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Molybdenum alkylidene complexes : syntheses and applications to olefin metathesis reactions
… Characterization and Activity as Chiral Olefin Metathesis Catalysts. Molybdenum olefin metathesis catalysts that contain previously unexplored aliphatic 1- phenylcyclohexylimido (PhCyN) and 2-phenyl-2-adamantylimido (PhAdN) groups were prepared and shown to be efficient and selective in a …
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Quantifying the economic potential of a biomass to olefin technology
… conserve oil is worth studying. Biomass waste to olefin (WTO) technology replaces the use of oil as a feedstock. WTO technology is actually a combination of two different processes: the waste to methanol (WTM) process and the methanol to olefins (MTO) process. However, WTO technology is still not …
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Development of Copper(I) Hydride-Catalyzed Asymmetric Olefin Hydrofunctionalization Reactions
… hydrofunctionalization reactions of olefins. The first chapter highlights a method on CuH-catalyzed asymmetric hydroamination of strained trisubstituted alkenes, including cyclobutenes and cyclopropenes. The second chapter presents an approach for accessing enantioenriched …
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HYPERVALENT IODINE-MEDIATED HETEROCYCLIC GROUP TRANSFER REACTIONS TO OXIDATIVE OLEFIN DIFUNCTIONALIZATION
… of 3-aminopiperidine salts via diamination of olefins (Chapter 3). Both methods are promoted by nitrogen-ligated hypervalent iodine reagents (N-HVIs). These novel class of reagents serve as “heterocyclic group transfer reagents,” incorporating diverse pyridinium salts under mild conditions and …
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Intramolecular Anodic Olefin Coupling Reactions: Synthesis Of Nitrogen- And Oxygen-Heterocycles
… Hence, the reactions are usually terminated with olefin nucleophiles. The use of heteroatom-based coupling partners to form carbon-heteroatom bond is less explored despite the wide occurrence of heterocyclic compounds as natural products, pharmaceuticals, and synthetic building blocks. Therefore, …
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Ni(II) and Pd(II) based catalysts for α-olefin polymerisation
A variety of Ni(II) and Pd(II) based catalysts have been synthesised and used in homopolymerisation of ethylene and 1-hexene at room temperature.
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