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Showing 1 to 17 of 17 for “"metallocenes"”.
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Electron Transfer in Mixed-Valence Metallocenes
Made available in DSpace on 2014-12-13T20:10:49Z (GMT). No. of bitstreams: 1 8009078.pdf: 6044542 bytes, checksum: dc6b33993d220ce7e220b978df6e2b85 (MD5) Previous issue date: 1979
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Synthetic Applications of Polar Transition Metal Metallocenes
… structure of ferrocene was elucidated in 1952, metallocenes have generated a vast amount of interest. Transition metal metallocenes have previously been shown to be suitable precursors in the syntheses of novel organometallic and metallo-organic complexes, although the use of metal halide …
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Studies of Electron Delocalization in Paramagnetic Metallocenes
Made available in DSpace on 2014-12-09T17:35:57Z (GMT). No. of bitstreams: 1 6808203.pdf: 6505746 bytes, checksum: a41b026007e28b49195753767e2f4d8c (MD5) Previous issue date: 1967
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Azobenzene, Diphenylacetylene and Aromatic Nitrogen Heterocycles Coordinated to Early Transition Metal Metallocenes
The structures of titanocene(azobenzene) (I), vanadocene(azobenzene) (II), vanadocene(diphenylacetylene) (III) and molybdenocene(diphenylacetylene) (IV) were determined using X-ray crystallography.
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Efficient & Novel Approaches to Relay Chirality in the Synthesis of Planar Chiral Metallocenes
… –cyclopentadienyl)(η4–iminocyclopentadiene)cobalt metallocenes in good yields >60% yield and in some cases a diastereomeric ratio of up to 5:1. The isocyanide insertion reaction was in some cases complementary to the results observed for the isocyanides isoelectronic equivalent carbon monoxide …
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Use of microelectrochemical devices to study diffusion of electroactive species in nonfluid media and photoelectrochemistry of surface-confined metallocenes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1994.
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Probing Organometallic Reactions With 19F NMR
… fundamental aspects of the reaction of group 4 metallocenes with methylaluminoxane (MAO) that lead to active Ziegler-Natta olefin polymerization catalysts. A novel experimental approach is described, in which a unique spectroscopic probe (a fluorinated substituent) is attached to the metallocene …
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Pressure Tuning Spectroscopy of Metal Cluster Compounds and Organometallics
… can determine as a function of pressure for metallocenes; (6) pressure can greatly enhance intermolecular interactions between metallocenes in the solid state, thereby drastically affecting the infrared spectra for these molecules.
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Asymmetrische Synthese planar- und zentral-chiraler 1,2,3-trisubstituierter und 1,3-disubstituierter Ferrocene
Metallocenes and their most important derivative, ferrocenes, are important building blocks in many areas of modern organic chemistry due to their unique electronic and steric properties. Ferrocenes are predominantly used in catalysis, however, nowadays they have also found application in material …
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Solid Phase Synthesis and Biological studies on metal conjugates of bioactive peptides for targeted delivery
… peptides. In this study, the two redox active metallocenes, ferrocene and cobaltocenium and in addition the cytotoxic platinum were chosen as metal labels. The investigated peptides were the Simian Virus 40 nuclear localisation signal (NLS), the HIV transactivator of transcription (TAT) peptide …
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Synthese von planar chiralen Imidazoliumsalzen, ihren Metall-Carbenkomplexen und deren Verwendung in der asymmetrischen Katalyse
… is often implemented by the application of metallocenes such as ferrocene derivatives. Some industrially important syntheses are amongst those processes, including the preparation of the herbicide (S)-metolachlor, which is obtained through an asymmetric hydrogenation reaction mediated by a …
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Synthesis of Functionalised Cobalt Sandwich Complexes for Application in Asymmetric Catalysis
… butadiene)(η5-carbomethoxycyclopentadienyl)cobalt metallocenes (1,3-[trans] vs 1,2-[cis] selectivity up to 6:1). Friedel-Crafts reaction on the major isomers gave exclusively the para-acylation of the unsubstituted phenyl groups.
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Exploring the Chemistry of Cyclopentadienyl-Cobalt-Cyclobutadiene (CpCoCb) Complexes and Synthesis of Side-Chain CpCoCb Polymers
… This resulted in the formation of bis-alkynyl metallocenes of Ti and Co and half sandwich Ni complexes featuring a pendent alkyne. Synthesis of side chain cobalt(I) polymers demonstrating the CpCoCb framework has also been explored, using pre-functionalized Cp ligands incorporating a …
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Organometallic redox-interfaces for selective electrochemical separations
… set to various bi-pyridines and functionalized metallocenes, and studied various problems ranging from reactive separations to catalytic remediation of contaminants of emerging concern. A second major thrust consists in utilizing asymmetric pseudo capacitors as the next generation configuration …
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The Use of Functionalized Zirconocenes as Precursors to Silica-Supported Zirconocene Olefin Polymerization Catalysts
… efficiently. The Sn-X bonds of the stannylated metallocenes were however relatively unreactive toward water and were excluded as candidates precursors for supported metallocene catalysts. X-ray crystal structures of (h5-ClMe2Sn-C5H4)CpZrCl2·½toluene, (h5-Br2MeSn-C5H4)CpZrBr2·THF, B, and C were …
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[1]- und [2]Borametallocenophane der Gruppe-4-Metalle : Synthese, Struktur und katalytische Aktivität
In der vorliegenden Arbeit wird über die Synthese, Struktur und katalytische Aktivität von borverbrückten Gruppe 4 Metallocenophanen berichtet, die als Katalysatoren in der Ziegler-Natta-artigen Olefinpolymerisation eingesetzt werden können. Neben den bereits bekannten [1]Borametallocenophanen …
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Accurate ionic bond energy measurements with TCID mass spectrometry and imaging PEPICO spectroscopy
<p>Two projects are presented here. In the first, metal-cyclopentadienyl bond dissociation energies (BDEs) were measured for seven metallocene ions (Cp<sub>2</sub>M<sup>+</sup>, Cp = η<sup>5</sup>-cyclopentadienyl = c-C<sub>5</sub>H<sub>5</sub>, M = Ti, V, Cr, Mn, Fe, Co, Ni) using threshold …