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Viac informácií o knihe Metal Complex Catalysts Supercritical Fluid Polymerization Supramolecular Architecture

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Thepolymerizationofole nsanddi-ole nsisoneofthemostimportanttargets inpolymerscience.Thisreviewarticledescribesrecentprogressinthis eldand deals with organo-transition metal complexes as polymerization catalysts. - cent developments in organometallic chemistry have prompted us to nd a precise description of the mechanism of propagation, chain transfer, and terminationstepsinthehomogeneouslymetal-assistedpolymerizationofole ns anddiole ns.Thus,thisdevelopmentprovidesanideafordesigninganycatalyst systems that are of interest in industry. Recently,the agostic interactionofalkylgroup(s)ontransitionmetalshas emerged as highly basic and new concept and is found to be important in understandingthemechanismofthemetal-catalyzedhomogeneousoligomer- ation and polymerization of a-ole ns. Early transition metal alkyl complexes generallyhavepartiallyionicM C bondsandshowa-agostichydrogeninter- tion that somewhat stabilizes the catalytically active species by providing el- tronsatavacantsite onthe metal.Thisisinsharp contrasttothefactthatlate transition metal alkyl complexes show mainly b-agostic hydrogen interaction that causes the hydrogen transfer easily through b-hydrogen elimination and reductive elimination, and that gives rise to the oligomerization of ole ns. Organometalliccomplexesoftheearlyandlatetransitionmetalshavebeenused as catalysts for ole n oligomerization and polymerization. The mechanism involved in these catalyst systems depends very much upon the kind of metal centersaswellastheirco-ligands,andthusthedi?erentmechanismswhichcan bedistinguishedbydetailedinvestigationsshouldbeassumedforearlyandlate transition metal catalysts. In this contribution, we review the mechanism of polymerization and oligomerization involving early transition metals, taking as our basis recent resultsinadvancedorganometallicchemistry.Firstofall,somerecentexamples of the previous reviews concerning the Ziegler-Natta polymerization are cited [1 10]. Then, relevant new reports are surveyed in a systematic fashion.

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Zaradenie knihy Knihy po anglicky Technology, engineering, agriculture Industrial chemistry & manufacturing technologies Industrial chemistry

• Celý názov: Metal Complex Catalysts Supercritical Fluid Polymerization Supramolecular Architecture
• Autor: D.A. Canelas, J.M. DeSimone, A. Harada, E. Ihara
• Jazyk: Angličtina
• Väzba: Pevná
• Počet strán: 207
• EAN: 9783540626992
• ISBN: 3540626999
• ID: 01566329
• Nakladateľ: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
• Hmotnosť: 450 g
• Rozmery: 235 × 155 × 15 mm
• Dátum vydania: 30. July 1997

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