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Titolo:
Nickel chelate complexes of 2-alkylphenylphosphanylphenolates: Synthesis, structural investigation and use in ethylene polymerization
Autore:
Heinicke, J; Koesling, M; Brull, R; Keim, W; Pritzkow, H;
Indirizzi:
Univ Greifswald, Inst Chem & Biochem, D-17487 Greifswald, Germany Univ Greifswald Greifswald Germany D-17487 , D-17487 Greifswald, Germany Rhein Westfal TH Aachen, Inst Tech Chem & Petrolchem, D-52056 Aachen, Germany Rhein Westfal TH Aachen Aachen Germany D-52056 , D-52056 Aachen, Germany Univ Heidelberg, Inst Anorgan Chem, D-69120 Heidelberg, Germany Univ Heidelberg Heidelberg Germany D-69120 , D-69120 Heidelberg, Germany
Titolo Testata:
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
fascicolo: 2, , anno: 2000,
pagine: 299 - 305
SICI:
1434-1948(200002):2<299:NCCO2S>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANOMETALLIC COMPLEXES; ETHENE OLIGOMERIZATION; CATALYST PRECURSORS; CRYSTAL-STRUCTURE; LIGANDS; COORDINATION; DERIVATIVES; PHOSPHINES; TITANIUM; ELEMENT;
Keywords:
phosphanylphenolate; cyclopentadienylnickel complexes; chelates; ethylene polymerization; crystal structure; polymerizations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Heinicke, J Univ Greifswald, Inst Chem & Biochem, Soldmannstr 16, D-17487 Greifswald, Germany Univ Greifswald Soldmannstr 16 Greifswald Germany D-17487 any
Citazione:
J. Heinicke et al., "Nickel chelate complexes of 2-alkylphenylphosphanylphenolates: Synthesis, structural investigation and use in ethylene polymerization", EUR J INORG, (2), 2000, pp. 299-305

Abstract

2-Diphenylphosphanyl- and 2-alkylphenylphosphanyl-4-methylphenols 1 or their silyl ethers 2 and equimolar amounts of nickelocene react in benzene preferably to give orange-brown diamagnetic cyclopentadienylnickel chelate complexes [eta-CpNi((PO)-O-boolean AND)] (3). Addition of a second equivalent of 1 or 2 affords (RR) and (SS) diastereoisomers of cis-bis((PO)-O-boolean AND-chelates) 4a-c (R = Ph, Me, iPr) or the unsymmetrical cis-bis((PO)-O-boolean AND-chelate) 5, whereas with bulkier substituted derivatives 1d or 2d(R = tBu) the second step is hindered or retarded. The reactivity of 1d remains high towards nickel salts in polar solvents, but in contrast to 1a-c,yielding 4, a sparingly soluble green trans-bis(P-O-chelate) nickel complex 6d is formed. Complexes formed in situ from 1 or 2 and Ni(COD)(2) in toluene catalyze the polymerization of ethylene. The cyclopentadienyl ((PO)-O-boolean AND) complexes 3, however, are too stable to be active in this process. The crystal and molecular structure of 3c and 4c are described.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 10:42:53