Synthesis and Reactivity Studies of Chromium Complexes Supported by Β–diketiminate Ligands PDF Download
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Author: Yu-Ting Hung
Publisher:
ISBN: 9780355735567
Category :
Languages : en
Pages : 312
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Author: Yu-Ting Hung
Publisher:
ISBN: 9780355735567
Category :
Languages : en
Pages : 312
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Book Description
Author: Ludwig Farkas-Vukotinović
Publisher:
ISBN:
Category : Oak
Languages : en
Pages :
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Author: Pengcheng Wu
Publisher:
ISBN: 9780438931831
Category :
Languages : en
Pages : 288
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This dissertation describes research on imido chromium(VI) complexes. The relative instability of the highest oxidation state and the weaker metal-bonds of the first-row metal generally make for sparse organometallic chemistry of hexavalent chromium. The motivation of my research is to make high valent chromium complexes supported by imido ligands and explore their reactivity in C-H activation, olefin metathesis and the activation of other small molecules (e.g. PhNCO, CO2).
Author: Richard Alan Hall
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
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Author: Xuliang Dai
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 512
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Author: Joanna Gurnham
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages : 0
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There has been a growing demand for specific linear alpha olefins in the polyethylene industry in order to control polymer rheology. This growing demand thereby increases the need for highly active and selective ethylene oligomerization catalysts. Chromium-based catalysts continue to be of high interest for this application due to this metal's versatility in both selective and non selective ethylene oligomerization. Ligand design is an important consideration in oligomerization chemistry: the ability of the ligand to stabilize low valent chromium and to support a two-electron redox process will allow the catalytic systems to follow the selective ring expansion mechanism for oligomerization. Chelating aminophosphane based ligands, previously studied by our group, have been shown to support both tri- and tetramerization of ethylene. We have explored modifications of one of the NP arms by replacing with a different coordinating group in an attempt to further stabilize the monovalent state of chromium and increase selectivity. Other ligands explored in this work are pyrrole based ligands, which have shown high activity and selectivity towards ethylene oligomerization. One example of this is the commercial Chevron-Phillips system. Recently, the co-polymerization of CO2 with epoxides has been studied as an environmentally friendly route to convert CO2 into biodegradable polymers. The first successful catalytic system to achieve these results consisted of a diethyl-zinc complex. More recently, aluminum, chromium, cadmium and cobalt have been studied as polycarbonate catalysts. To date, the only reported chromium catalysts for CO2-epoxide copolymerization are Cr-salen and Cr-porphyrin complexes, studied by Darrensbourg and Holmes, respectively. We were particularly interested in finding new chromium-based complexes able to catalyze epoxide/CO2 copolymerization by using molecules with the nitrogen donor motif embedded in different functions such as neutral pyridines with anionic pendants, pyrroles with either imine or amine pendants, or a combination of these.
Author: Nathan Christopher Smythe
Publisher:
ISBN:
Category :
Languages : en
Pages : 414
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(Cont.) Chapter 4. TRAP (P(CH2CH2NH2)3), a phosphine containing analogue to TREN (N(CH2CH2NH2)3) was synthesized from PH3, but suitable conditions for arylation of the amine arms could not be found. Using the "pre-arylated" arm BrCH2CH2N(BOC)HIPT (BOC = tert-butoxycarbonyl; HIPT = 3,5-(2,4,6-i-Pr3C6H2)2C6H3) in the reaction with PH3 resulted in the isolation of H2PCH2CH2N(BOC)HIPT, but further substitution was unsuccessful. HIPTBr could be converted to HIPTNH2 using benzophenone imine and a rac-BINAP (2,2'-bis(diphenylphosphino)-1,1'-binaphthyl) supported Pd catalyst in preparation for DCC (dicyclohexylcarbodiimide) mediated coupling to tris-(3-propylcarboxylicacid)phosphine.
Author:
Publisher: John Wiley & Sons
ISBN: 0470651547
Category : Science
Languages : en
Pages : 221
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Book Description
The Inorganic Syntheses series provides all users of inorganic substances with detailed and foolproof procedures for the preparation of important and timely compounds. Includes complete, up-to-date procedures involving important inorganic substances Contains subject, contributor, and formula indexes
Author: Lan Wang
Publisher:
ISBN: 9780355762327
Category :
Languages : en
Pages : 183
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Author: Enrique Gonzalez-Vergara
Publisher:
ISBN:
Category : Carbohydrates
Languages : en
Pages : 236
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