Nickel Complexes Bearing New P,N-Phosphinopyridine Ligands for the Catalytic Oligomerization of Ethylene

Autor:	Lucien Saussine, Pierre Braunstein, Fredy Speiser
Rok vydání:	2004
Předmět:	Inorganic Chemistry chemistry.chemical_compound Nickel Ethylene chemistry Stereochemistry Organic Chemistry Pyridine chemistry.chemical_element Physical and Theoretical Chemistry Medicinal chemistry Catalysis
Zdroj:	Organometallics. 23:2633-2640
ISSN:	1520-6041 0276-7333
DOI:	10.1021/om034203i
Popis:	The new phosphinopyridine ligands 2-[(diphenylphosphanyl)methyl]-6-phenylpyridine (5), 2-(2,6-dimethylphenyl)-6-[(diphenylphosphanyl)methyl]pyridine (6), 2-(2,6-diisopropylphenyl)-6-[(diphenylphosphanyl)methyl]pyridine (7), and 2-[2-(diphenylphosphanyl)phenyl]-6-methylpyridine (8) have ben prepared in order to compare the influence of their stereoelectronic properties on the catalytic behavior of their respective mononuclear [NiCl2(P,N)] complexes 9−12. These Ni(II) complexes are paramagnetic in solution, as determined by the Evans method. Whereas they were inactive for the oligomerization of ethylene in the presence of methylalumoxane (MAO), they provided activities up to 61 000 mol of C2H4/((mol of Ni) h) (11) in the presence of only 6 equiv of AlEtCl2. The selectivities for C4 olefins were as high as 92% (12 with 2 equiv of AlEtCl2).
Databáze:	OpenAIRE
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