| Metal Complex Catalysts Supercritical Fluid Polymerization Supramolecular Architecture Softcover Repri Edition Contributor(s): Canelas, D. a. (Contribution by), Desimone, J. M. (Contribution by), Harada, A. (Contribution by) |
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ISBN: 3662147939 ISBN-13: 9783662147931 Publisher: Springer OUR PRICE: $52.24 Product Type: Paperback - Other Formats Published: October 2013 |
| Additional Information |
| BISAC Categories: - Science | Chemistry - General - Technology & Engineering | Textiles & Polymers - Science | Physics - Condensed Matter |
| Dewey: 530.41 |
| Series: Advances in Polymer Science |
| Physical Information: 0.46" H x 6.14" W x 9.21" (0.68 lbs) 207 pages |
| Descriptions, Reviews, Etc. |
| Publisher Description: 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. |
