Metal Complex Catalysts Supercritical Fluid Polymerization Supramolecular Architecture
(Sprache: Englisch)
Thepolymerizationofole nsanddi-ole nsisoneofthemostimportanttargets inpolymerscience.Thisreviewarticledescribesrecentprogressinthis eldand deals with organo-transition metal complexes as polymerization catalysts. - cent developments in organometallic...
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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
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Inhaltsverzeichnis zu „Metal Complex Catalysts Supercritical Fluid Polymerization Supramolecular Architecture “
- K. Mashima/Y. Nakayama/A. Nakamura: Recent Trends in Polymerization of alpha-Olefins Catalyzed by Organometallic Complexes of Early Transition Metals- H. Yasuda/E. Ihara: Rare Earth Metal Initiated Living Polymerizations of Polar and Nonpolar Monomers
- D.A. Canelas, J.M. DeSimone: Polymerizations in Liquid and Supercritical Carbon Dioxide
- A. Harada: Design and Construction of Supramolecular Architectures Consisting of Cyclodextrins and Polymers
Bibliographische Angaben
- 2013, Softcover reprint of the original 1st ed. 1997, VII, 207 Seiten, 1 farbige Abbildungen, Maße: 15,5 x 23,5 cm, Kartoniert (TB), Englisch
- Verlag: Springer, Berlin
- ISBN-10: 3662147939
- ISBN-13: 9783662147931
Sprache:
Englisch
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