Norbornene

About: Norbornene is a research topic. Over the lifetime, 5628 publications have been published within this topic receiving 104495 citations. The topic is also known as: norbornylene & norcamphene.

Metalorganic catalysts for synthesis and polymerisation : recent results by Ziegler-Natta and metallocene investigations

Abstract: 1. Heterogeneous Ziegler-Natta Catalysis.- Polyethylene: Polymer with Future.- Polypropylene: 44 Years Young! The Challenge for the 21st Century.- Characterization of PP Prepared with the Latest Metallocene and MgCl2-supported TiCl4 Catalyst Systems.- An Absolute Test of Rival Theories for MWDs in Heterogeneous Polymerization-MWDs during Quasi-Living Polymerization.- Olefin Polymerization with Novel Type of Ziegler Catalysts.- Kinetics and Mechanism of Ethylene Polymerization and Copolymerization Reactions with Heterogeneous Titanium-Based Ziegler-Natta Catalysts.- New Insight into Propene Polymerization Promoted by Heterogeneous Ziegler-Natta Catalysts.- Energy Distribution of Active Sites in Heterogeneous Ziegler-Natta Catalysts. Method of Study of Active Site Non-uniformity.- Ziegler-Natta and Metallocene Polymerisation of Olefins with Heterogeneous Catalysts.- 2. Homogeneous Catalysis, Synthesis and Polymerization.- Formation, Structure and Mechanism of Oligomeric Methylaluminoxanes(MAO).- The Activation of Metal-Fluorine Bonds in Compounds of Group 4 by Aluminum Alkyls.- A DFT Quantum-chemical Study of the Structures and Reactive Sites of Polymethylalumoxane.- In situ FTIR Spectroscopy Shows no Evidence of Reaction between MAO and TMA.- Alumoxanes alternative to MAO: Synthesis and characterization.- Expanding the Scope of Metallocene Catalysis: Beyond Indenyl and Fluorenyl Derivatives.- New C1-Symmetric Metallocenes for the Polymerization of Olefins.- New Catalyst Concepts for the Polymerization of Ethylene with Metallocenes.- Synthesis of Novel Complex with Bridged Bis(indenyl)Ligand and its Polymerization Behavior of Propylene.- Linked Amido-Cyclopentadienyl Complexes of Group 3 and 4 Metals: The First "Post-Metallocenes".- Late Transition Metal Catalysts for Olefin Polymerization.- 3. Homogeneous Catalysis, Mechanism of Polymerization.- Chain Growth in Zirconocene-catalyzed Olefin Polymerization -DFT Studies on Possible Reaction Paths and the Influence of a Second Olefin Ligand.- Syndiotactic and Isotactic Specific Metallocene Catalysts with Hapto-flexible Cyclopentadienyl-Fluorenyl Ligand.- Current Vitality of Ziegler's Monumental Discovery of Zirconium Catalysis in Olefin Polymerization: Metallocene and Nonmetallocene Catalysts via Reductive Dimerization.- Kinetic Features of Living Polymerization of Propene with the [t-BuNSiMe2Flu]TiMe2/B(C6F5)3 Catalyst.- Quantitative Structure-Activity Relationships for Unbridged Zirconocene Catalysts During Ethene Polymerization.- Coexistence of two Active Species in the Polymerization of 1-Hexene Catalyzed with Zirconocene/MAO Catalysts.- In-depth Investigation of Unsaturated Chain-end Groups: A Tool for Understanding Hydrogen Activation Mechanism in Zirconocene Catalysed Propene Polymerization.- 4. Supported Metallocene Catalysts.- Supported Metallocene Catalysts for Propene Polymerization.- Influence of the Particle Size of Silica Support on the Kinetics and the Resulting Polymer Properties at the Polypropylene Polymerization with Heterogeneous Metallocene Catalysts Part I: Experimental Studies and Kinetic Analysis.- Influence of the Particle Size of Silica Support on the Kinetics and the Resulting Polymer Properties at the Polypropylene Polymerization with Heterogeneous Metallocene Catalysts Part II: Development of a Model as well as a Mathematical Simulation.- Supported Metallocene Catalysts in Olefin Polymerization: Toward High Performances.- Zeolite Supported Metallocene Catalysts: Effect of Support Structure and Surface Groups on the Polymerization Process.- Preparation of Novel Supported Metallocene and their Olefin Polymerization Capabilities.- Development of Supported Single-site Catalysts and Produced Polyethylene.- Ethylene Polymerization with the Heterogeneous Single Site CpIndZrCl2 Catalyst.- The Impact of the Cocatalyst on the Polymerisation Behaviour of Supported Metallocenes.- Heterogenised MAO-free Metallocene Catalysts.- A New Supported Zirconocene Catalyst for Ethylene Polymerization.- 5. Polystyrene and Copolymers.- Syndiospecific Polymerization of Styrene.- Monocyclopentadienyl Titanium Catalyst.- The Effects of the Bridge Structure and the Ligand System of Zirconocene Catalysts on the Copolymerization of Styrene and Ethylene.- Branched Polyethenes Prepared via Olefin Copolymerization and Migratory Insertion.- Metallocene Catalyzed Alternating Copolymerization of Olefins.- Copolymer Microstructures of Ethylene Norbornene Copolymers Prepared with Homogeneous Metallocene Based Catalysts.- Studies on Properties of Metallocene Catalysed Copolymers of Ethylene and Linear, Non-conjugated Dienes.- Ethylene/?-Olefin Copolymerization with Dimethylsilyl-bis-(2-methyl-4-phenyl-indenyl)zirconium dichloride and Methylaluminoxane: Influences on Polymerization Activity and Molecular Weight.- 6. Functional Polyolefins and Polydienes.- The Role of the Cyclopentadienyl Ligand in Catalysts for 1,3-Diene Polymerization.- Catalytic Reaction Mechanisms and Structure-Reactivity Relationships in the Stereospecific Butadiene Polymerization.- Styrene and Conjugated Dienes Polymerization with Half Sandwich Titanocene Catalysts.- Half-Vanadocene Catalyst for Butadiene Polymerization.- Chemical Functionalization of Polypropylene with a V-based Living Polymerization Catalyst.- Copolymerization of Ethylene/?-Hydroxy ?-Olefins.- Stereospecific Polymerization of Methacrylates with Dimethylsilylene-bridged Zirconocene Catalysts.- Development of Catalytic Systems based on Lanthanoid Complexes for Olefin Polymerization.- 7. Polymer Characterization and Processes.- Initial 2,1-Insertions in Metallocene Polymerizations of Polypropylene.- Olefin Polymerization with DuPont's VersipolTM Catalyst System.- Features of Cyclopentadienyl Metal Catalysts for Ethylene Copolymerization in Gas and Liquid Phase.- How to Avoid Gas-Liquid Mass Transfer Limitations During Polymerization of Olefins.- Ternary Metallocene Based Catalysts in High Temperature, High Pressure Polymerization.- Advanced in the Use of Stopped-flow Techniques for Olefin Polymerization.- Contributors.

The photochemical nucleophile–olefin combination, aromatic substitution reaction (Part 2): methanol – cyclic olefins, 1,4-dicyanobenzene

Abstract: Direct irradiation of acetonitrile–methanol (3:1) solutions of 1,4-dicyanobenzene and the cyclic olefins, cyclohexene, 1-methylcyclohexene, norbornene, and 2-methylnorbornene, leads to formation of regio- and stereoisomers of the 1:1:1 (alcohol:olefin:aromatic) adducts. This reaction can be photosensitized by electron transfer; addition of electron donors, biphenyl or phenanthrene, to the irradiation mixture generally increases the efficiency and yield of adduct formation. The efficiency of the reaction and the ratio of isomeric adducts are also affected by the addition of salts, particularly magnesium perchlorate. All of the possible regio- and stereoisomers from cyclohexene and 1-methylcyclohexene have been identified, two from cyclohexene and four from 1-methylcyclohexene. Three of the four possible isomers from norbornene were characterized; the endo,endo isomer was not detected. There are eight possible isomers from 2-methylnorbornene; six were detected and five have been isolated and identified. The...

(η3‐allyl)palladium(II) catalysts for the addition polymerization of norbornene derivatives with functional groups

Abstract: Cycloaliphatic polyolefins with functional groups were prepared by the Pd(II)-catalyzed addition polymerization of norbornene derivatives. Homo- and copolymers containing repeating units based on bicyclo[2.2.1] hept-5-en-2-ylmethyl decanoate (endo/exo-ratio = 80/20), bicyclo[2.2.1]hept-5-ene-2-carboxylic acid methyl ester (exo/endo = 80/20), bicyclo[2.2.1]hept-5-ene-2-methanol (endo/exo = 80/20), and bicyclo[2.2.1]hept-5-ene-2-carboxylic acid (100% endo) were prepared in 49–99% yields with {(η3-allyl)Pd(BF4)} and {(η3-allyl)Pd(SbF6)} as catalysts. The catalyst containing the hexafluoroantimonate ion was slightly more active than the tetrafluoroborate based Pd-complex.

Janus tricyclononene polymers bearing tri(n-alkoxy)silyl side groups for membrane gas separation

Abstract: A series of polymers of a new type, which contain rigid polymer main chains (glassy nature) and long flexible side substituents (rubbery nature), were prepared from norbornene derivatives with (AlkO)3Si-groups of a different length (Alk = Me, Et, n-Pr, n-Bu) as promising materials for membrane separation of gaseous hydrocarbons. The 1st generation Grubbs complex and Pd–N-heterocyclic carbene complex in combination with Na+[(3,5-(CF3)2C6H3)4B]− and PCy3 were used as catalysts of metathesis and addition polymerization in the synthesis of high-molecular weight polymers (Mw ≤ 1.1 × 106) with good or high yields (up to 99%). The prepared addition polymers were glassy, while the glass transition temperature of metathesis polymers depended on the length of the alkyl-group in (AlkO)3Si-substituents and it varied in the range of −44 to 61 °C. The dramatic tuning of polymer gas-transport properties was demonstrated by the change of the polymer main chain structure and the length of tri(n-alkoxy)silyl side groups. For example, we have succeeded for the first time in obtaining metathesis polynorbornenes, which turned out to be more permeable than their addition isomers. Not being large free volume polymers, all studied metathesis and addition polytricyclononenes exhibited solubility controlled permeation of hydrocarbons (P(n-C4H10) up to 8100 barrer) and high C4/C1 selectivity (22–49).