Author: Steven Frank Pedersen
Publisher:
ISBN:
Category :
Languages : en
Pages : 328
Book Description
Synthesis and Reactivity of Phenylimido and Alkylidyne Complexes of Tungsten (VI)
Author: Steven Frank Pedersen
Publisher:
ISBN:
Category :
Languages : en
Pages : 328
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 328
Book Description
The Synthesis and Reactivity of Tungsten (VI) Alkylidynes and Tungsten (IV) Complexes
Author: Mark L. Listemann
Publisher:
ISBN:
Category :
Languages : en
Pages : 342
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 342
Book Description
Synthesis and Reactivity of Tungsten (VI) Alkylidene and Metallacyclobutane Complexes
Author: Jerald Feldman
Publisher:
ISBN:
Category :
Languages : en
Pages : 384
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 384
Book Description
Reactions of Tungsten(VI) Alkylidyne Complexes
Author: John H. Freudenberger
Publisher:
ISBN:
Category :
Languages : en
Pages : 504
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 504
Book Description
Synthesis and Reactivity of Molybdenum and Tungsten Alkylidyne Complexes
Author: Laughlin G. McCullough
Publisher:
ISBN:
Category :
Languages : en
Pages : 282
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 282
Book Description
Novel Strategies for the Synthesis of Tungsten(VI) and Molybdenum(VI) Imido/Oxo Alkylidene NHC Complexes and Their Application in Ring-Opening Metathesis Polymerization
Author: Janis Musso
Publisher: Cuvillier Verlag
ISBN: 3736966113
Category : Science
Languages : en
Pages : 186
Book Description
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.
Publisher: Cuvillier Verlag
ISBN: 3736966113
Category : Science
Languages : en
Pages : 186
Book Description
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.
Synthesis and Reactivity of Some Molybdenum(VI) Alkylidene and Alkylidyne Complexes
Author: John Stephen Murdzek
Publisher:
ISBN:
Category :
Languages : en
Pages : 1082
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 1082
Book Description
Synthesis and Reactivity of Low Valent Tungsten Hydride Complexes with Alkylidyne Or Nitrosyl Ligands
Author: Franck Furno
Publisher:
ISBN:
Category :
Languages : en
Pages : 219
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 219
Book Description
Study of Tungsten(IV) and Tungsten(VI) Imido Complexes
Author: Corey B. Wilder
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
American Doctoral Dissertations
Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 564
Book Description
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 564
Book Description