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Titolo:
Preparation and structural features of 1-(2-pyridyl)- and 1-(2-furyl)indenyl-zirconium complexes
Autore:
Dreier, T; Frohlich, R; Erker, G;
Indirizzi:
Univ Munster, Inst Organ Chem, D-48149 Munster, Germany Univ Munster Munster Germany D-48149 rgan Chem, D-48149 Munster, Germany
Titolo Testata:
JOURNAL OF ORGANOMETALLIC CHEMISTRY
fascicolo: 1-2, volume: 621, anno: 2001,
pagine: 197 - 206
SICI:
0022-328X(20010301)621:1-2<197:PASFO1>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
CYCLOPENTADIENYL LIGANDS; CRYSTAL-STRUCTURE; POLYMERIZATION BEHAVIOR; OLEFIN POLYMERIZATION; CATALYST PRECURSORS; ZIRCONIUM COMPLEXES; EFFICIENT SYNTHESIS; AMINE ELIMINATION; BLOCK ELEMENTS; SIDE-CHAIN;
Keywords:
homogeneous Ziegler-Natta catalysts; indenyl lithium compounds; polypropylene; substituted zirconocenes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Erker, G Univ Munster, Inst Organ Chem, Corrensstr 40, D-48149 Munster, Germany Univ Munster Corrensstr 40 Munster Germany D-48149 ster, Germany
Citazione:
T. Dreier et al., "Preparation and structural features of 1-(2-pyridyl)- and 1-(2-furyl)indenyl-zirconium complexes", J ORGMET CH, 621(1-2), 2001, pp. 197-206

Abstract

Addition of 2-lithiopyridine to 1-indanone followed by aqueous workup gave1-(2-pyridyl)indanol (3); subsequent H+-catalyzed H2O-elimination gave 3-(2-pyridyl)indene 4. Deprotonation with n-butyllithium yielded the corresponding anionic reagent 5. Treatment of 4 with Zr(NR2)(4) (R = CH3 or C2H5) yielded the half-sandwich complexes eta (5)-[1-(2-pyridyl)indenyl]Zr(NR2)(3) (7a, 7b). React;on of 5 with CpZrCl3 led to the formation of eta (5)-[1-(2-pyridyl)indenyl]CpZrCl2 (8). The compounds 3, 4, and 8 were characterized by X-ray diffraction. Analogous treatment of 1-indanone with 2-lithio-5-methylfuran, followed by H2O-elimination and deprotonation gave the reagent [1-(5-methyl-2-furyl)indenyl]Li (OEt2) 13. Its reaction with ZrCl4 in a 2:1 ratio in toluene yielded a 60:40 mixture of rac- and meso-bis[eta (5)-1-(5-methyl-2-furyl)indenyl]ZrCl2 (rac-14 and meso-14). Crystallization gave pure rac-14, which was characterized by an X-ray crystal structure analysis. Treatment of rac-14 with excess methylalumoxane (MAO) in toluene (Al:Zr approximate to 2000) gave an active homogeneous Ziegler catalyst for atactic propene polymerization, whereas the 8-MAO system was inactive. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 04:36:48