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Synthesis And Reactivity Of Tungsten Imido Complexes From A Zwitterionic Tungsten Zero Amido Precursor
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Book Synopsis Synthesis and Reactivity of Tungsten Imido Complexes from a Zwitterionic Tungsten Zero Amido Precursor by : Scott Taylor Massey
Download or read book Synthesis and Reactivity of Tungsten Imido Complexes from a Zwitterionic Tungsten Zero Amido Precursor written by Scott Taylor Massey and published by . This book was released on 1995 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Reactivity of Phenylimido and Alkylidyne Complexes of Tungsten (VI) by : Steven Frank Pedersen
Download or read book Synthesis and Reactivity of Phenylimido and Alkylidyne Complexes of Tungsten (VI) written by Steven Frank Pedersen and published by . This book was released on 1983 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Tungsten(IV) and Tungsten(VI) Imido Complexes by : Corey B. Wilder
Download or read book Study of Tungsten(IV) and Tungsten(VI) Imido Complexes written by Corey B. Wilder and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of tungsten guanidinate and amidinate complexes were synthesized to serve as precursors for the metal-organic chemical vapor deposition of tungsten nitride. Compounds were characterized by 1H and 13C NMR. In addition, mass spectrometry was used for characterization as well as to give insight into precursor fragmentation tendencies. Crystallography experiments were also conducted to investigate the bonding motifs present in the series of compounds.
Book Synopsis Synthesis and Reactivity of High Oxidation State Tungsten and Molybdenum Olefin Metathesis Catalysts Bearing New Imido Ligands by : Jonathan Clayton Axtell
Download or read book Synthesis and Reactivity of High Oxidation State Tungsten and Molybdenum Olefin Metathesis Catalysts Bearing New Imido Ligands written by Jonathan Clayton Axtell and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 1 details the synthesis of tungsten imidoalkylidene compounds bearing strongly electron-withdrawing imido ligands. An alternative synthesis involving the treatment of WCl6 with 4 equivalents of N-trimethylsilyl-substituted anilines and subsequent workup with 1,2-dimethoxyethane (DME) has been employed to form complexes of the type W(NAr)2C12(dme); syntheses employing WO2C 2(dme) as the tungsten precursor were unsuccessful. Alkylation with neopentylmagnesium chloride (ClMgNp) and subsequent treatment with trifluoromethanesulfonic acid (HOTf) affords imidoalkylidene species W(NAr)(CHCMe 3)(OTf)2(dme) (OTf = trifluoromethanesulfonate); analogous neophylidene ([W]CHCMe 2Ph) species could not be made under these conditions. Treatment of these compounds with two equivalents of LiO(2,6-(CHCPh 2)C6H3)-Et2O affords the bisaryloxide complexes of the type W(NAr)(CHCMe3)(OR)2. Ring-Opening Metathesis Polymerization (ROMP) studies using a series of these bisaryloxides show that rates of ROMP increase as the electron-withdrawing power of the substituents on the imido ligand increase if steric bulk about the metal center is held constant. A similar trend between two bisaryloxides is observed for anti-to-syn alkylidene rotation rates at 50*C in toluene-d8 . Difficulties synthesizing bis-pyrrolide complexes of the type W(NAr)(CHCMe3)(pyr)2 precluded their use as catalyst precursors; some MAP species containing the more sterically encumbering 2,5-dimethylpyrrolide ligand are presented and the metathesis activity of MAP species bearing the 2,5-dimethylpyrrolide ligand is discussed. Chapter 2 introduces Mo and W complexes bearing the current extreme in sterically bulky imido ligands, the NHIPT (HIPT = 2,6-(2,4,6-iPr 3CH2)CH3) ligand, in an effort to generate all anti alkylidene species. A non-traditional synthetic route is employed in order to install this ligand first as an anilide, and after subsequent proton transfer, as an imido ligand to form a mixed imido species of the type M(NHIPT)(N'Bu)(NH'Bu)Cl. Addition of one equivalent of 2,6-lutidinium chloride, followed by alkylation affords dialkyl species M(NHIPT)(N'Bu)Np 2, and treatment with three equivalents of pyridinium chloride yields all anti imidoalkylidene dichloride species as mono-pyridine adducts, M(NHIPT)(CHCMe 3)C 2(py) (M = Mo, W). General reactivity, including strategies for removal of the pyridine adduct as well as substitution and metathesis chemistry, are discussed. ROMP of MPCP (MPCP = 3-methyl-3-phenylcyclopropene) by a Mo-based MAP species bearing the NHIPT ligand yields predominantly cis,syndiotactic poly(MPCP) and in the homo-metathesis of 1 -octene yields ~81% cis-7-tetradecene. The possible source of trans olefinic product is addressed. Chapter 3 presents the synthesis of the first (1-adamantyl)imido species of tungsten. The functional equivalent of common bisimido precursors for other Mo/W alkylidene species, [W(NAd) 2C 2(AdNH2)1 2, is shown to be a dimer stabilized by hydrogen-bonding interactions between adamantylamine protons and adjacent chlorides bound to the second metal of the dimer. Subsequent alkylation with ClMgNp affords the expected dialkyl species, and treatment with three equivalents of 3,5-lutidinium chloride affords imidoalkylidene complex W(NAd)(CHCMe 3)(C) 2(lut)2 (lut = 3,5-dimethylpyridine). The most desirable synthetic route toward monoalkoxide pyrrolide (MAP) species proceeds through a monoaryloxide monochloride intermediate W(NAd)(CHCMe 3)(Cl)(OAr)(lut) (Ar = 2,6-(2,4,6-Me 3)C6H3, 2,6-(2,4,6-'Pr 3)C6H3). Removal of lutidine with B(C6 F5 )3 and subsequent treatment with lithium pyrrolide affords W(NAd)(CHCMe3)(pyr)(OAr) (pyr = pyrrolide); 2,5-dimethylpyrrolide analogues (W(NAd)(CHCMe3)(Me2pyr)(OAr) can be accessed via protonolysis by HOAr from W(NAd)(CHCMe3)(Me2pyr)2(lut).
Book Synopsis The Synthesis and Reactivity of Tungsten (VI) Alkylidynes and Tungsten (IV) Complexes by : Mark L. Listemann
Download or read book The Synthesis and Reactivity of Tungsten (VI) Alkylidynes and Tungsten (IV) Complexes written by Mark L. Listemann and published by . This book was released on 1985 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stabilization and Reactivity of Zero-valent Tungsten Nitrene Complexes by : Bruce A. Arndtsen
Download or read book Stabilization and Reactivity of Zero-valent Tungsten Nitrene Complexes written by Bruce A. Arndtsen and published by . This book was released on 1993 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis, Characterization and Reactivity of Molybdenum and Tungsten Imido Complexes of Relevance to Alkene Dimerization by :
Download or read book Synthesis, Characterization and Reactivity of Molybdenum and Tungsten Imido Complexes of Relevance to Alkene Dimerization written by and published by . This book was released on 2009 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Reactivity of Tungsten (VI) Alkylidene and Metallacyclobutane Complexes by : Jerald Feldman
Download or read book Synthesis and Reactivity of Tungsten (VI) Alkylidene and Metallacyclobutane Complexes written by Jerald Feldman and published by . This book was released on 1989 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Synthesis and Reactivity of Methylidyne and Hydride Complexes of Tungsten by : Steven J. Holmes
Download or read book The Synthesis and Reactivity of Methylidyne and Hydride Complexes of Tungsten written by Steven J. Holmes and published by . This book was released on 1983 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Novel Strategies for the Synthesis of Tungsten(VI) and Molybdenum(VI) Imido/Oxo Alkylidene NHC Complexes and Their Application in Ring-Opening Metathesis Polymerization by : Janis Musso
Download or read book Novel Strategies for the Synthesis of Tungsten(VI) and Molybdenum(VI) Imido/Oxo Alkylidene NHC Complexes and Their Application in Ring-Opening Metathesis Polymerization written by Janis Musso and published by Cuvillier. This book was released on 2022-05-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, the synthesis of neutral and cationic group(VI) imido/oxo alkylidene N-heterocyclic carbene (NHC) complexes that tolerate protic functional groups and aldehydes was reported. Unprecedented turnover numbers of up to 1.2 million were found for their silica-supported representatives. Some group(VI) alkylidene NHC complexes even display stability towards moisture and air. Coordination of the NHC to tungsten imido bistriflate precursor complexes, however, can lead to undesired side reactions. This work consequently aimed at the development of novel, more efficient routes to neutral and cationic tungsten imido/oxo alkylidene NHC complexes. In addition, some molybdenum imido alkylidene NHC complexes were targeted. Thereby, the scope of synthetically accessible complexes was broadened and, subsequently, their reactivity in ring-opening metathesis polymerization (ROMP) was probed. Those complexes were used as thermally latent initiators for the ROMP of dicyclopentadiene. Precise determination of the onset temperature of polymerization was achieved via monitoring with differential scanning calorimetry. Furthermore, the selectivity of novel complexes was tested for the formation of stereoregular polymers through ROMP of enantiomerically pure norbornene derivatives, which allowed for the synthesis of up to 98% trans-isotactic or cis-syndiotactic polymers depending on the steric demand of the imido and the alkoxide ligand.
Book Synopsis Kurze historische Nachricht von dem Ursprunge der Freymaurer-Gesellschaft und deren Geheimnissen by :
Download or read book Kurze historische Nachricht von dem Ursprunge der Freymaurer-Gesellschaft und deren Geheimnissen written by and published by . This book was released on 1742 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Reactivity of Cyclopentadienyl Complexes of Tungsten in Its Higher Oxidation States by : Robert Clark Murray
Download or read book Synthesis and Reactivity of Cyclopentadienyl Complexes of Tungsten in Its Higher Oxidation States written by Robert Clark Murray and published by . This book was released on 1985 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Reactivity of Tungsten Tris-(tri-tertbutyl) Silyl Imido Complexes: Neutral and Anionic Derivatives, Indirect Evidence for the Intermediacy of Metal-alkane Complexes in Solution by : Daniel Francis Schafer (II.)
Download or read book Synthesis and Reactivity of Tungsten Tris-(tri-tertbutyl) Silyl Imido Complexes: Neutral and Anionic Derivatives, Indirect Evidence for the Intermediacy of Metal-alkane Complexes in Solution written by Daniel Francis Schafer (II.) and published by . This book was released on 1999 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: The molecular structures of 1-H, 1-Me, 1-$\rm\sp{c}C\sb3H\sb4Me, $ 1-CH=C=CH$\sb2,$ 2-py, (2-KH) $\sb2,$ 2-$\rm KH{\cdot}(OEt\sb2)\sb3,$ (K(crypt-2,2,2)) ($\rm(\sp{t}Bu\sb3SiN)\sb3WH\rbrack$ (2-K(C222)H), (2-KI) $\sb3,$ (3-Cl) $\sb2,$ and 4-$\rm Li\sp{n}Bu$ were determined by X-Ray crystallography.
Book Synopsis Synthesis, Characterization and Reactivity of Zirconium (IV), Tantalum (V), and Tungsten (VI) Amido Complexes Containing Polydentate Ligands by : Percefoni Doufou
Download or read book Synthesis, Characterization and Reactivity of Zirconium (IV), Tantalum (V), and Tungsten (VI) Amido Complexes Containing Polydentate Ligands written by Percefoni Doufou and published by . This book was released on 1997 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Tungsten Nitrene Complexes as Precursors for Tungsten Nitride by :
Download or read book Synthesis of Tungsten Nitrene Complexes as Precursors for Tungsten Nitride written by and published by . This book was released on 1994 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical vapor deposition using organometallic precursors (MOCVD) provides a method for the preparation of thin films. Low valent tungsten nitrene complexes were synthesized as potential precursors to tungsten nitride (WN(x)), a material used in diffusion barriers for Si or GaAs semiconductor devices. The original target precursors for MOCVD of WN(x) were the carbonyl-containing complexes (CO)(5-n)(PR3)(n)W-NR, where R is an alkyl or aryl group. Later synthetic work involved the tungsten (IV) imido (or nitrene) complexes (CO) 2I2LW(triple bonds)NPh, which were prepared by oxidation of the zwitterionic species (CO)5WNPhNPhC(OMe)Ph with one equivalent of I2 followed by addition of a the coordinating species L L=THF, pyridine, PMe3, P(OMe)3.
Book Synopsis The Synthesis and Reactivity of Ynolate and Ynolester Tungsten Complexes by : Kimberly Ann Belsky
Download or read book The Synthesis and Reactivity of Ynolate and Ynolester Tungsten Complexes written by Kimberly Ann Belsky and published by . This book was released on 1990 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Reactions of Tungsten Complexes by : Dariusz Wodka
Download or read book Synthesis and Reactions of Tungsten Complexes written by Dariusz Wodka and published by . This book was released on 1997 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: