Nickel and iron complexes with oxazoline- or pyridine-phosphonite ligands; synthesis, structure and application for the catalytic oligomerisation of ethylene

Dalton Transactions : an International Journal of Inorganic Chemistry
Fredy SpeiserLucien Saussine

Abstract

The bis(oxazolinyl)phenylphosphonite ligand (bis(4,4-dimethyl-2-(1-hydroxy-1-methylethyl)-4,5-dihydrooxazole)phenylphosphonite, NOPONMe2)) and the new pyridine-phosphonite ligand (2-ethyl(1'-methyl-1-hydroxy)pyridine-6H-dibenz[c,e][1,2]oxaphosphorin) have been used for the preparation of the mononuclear complexes [NiCl2(NOPONMe2)] 18 and [NiCl2(6)2] 19, respectively, which catalyze the oligomerisation of ethylene with activities up to 57300 mol C2H4 mol Ni(-1) h(-1) (19 in the presence of only 6 equivalents of AlEtCl2). The selectivities for C4 dimers were as high as 90% (18 in the presence of only 2 equivalents of AlEtCl2) with selectivities for 1-butene of 21-22% of the C4 fraction. In the presence of 400 or 800 equivalents of MAO as cocatalyst, complex 19 yielded turnover frequencies of 7400 mol C2H4 mol Ni(-1) h(-1) and 13200 mol C2H4 mol Ni(-1) h(-1), respectively. The selectivities for 1-butene and ethylene dimers were similar to those obtained with AlEtCl2. The fact that 19 with a cyclic phosphonite moiety leads to higher activities and selectivities than 18 which contains an acyclic phosphonite group underlines the importance of the ligand on the catalytic properties of its metal complex. An unprecedented dinuclear iron...Continue Reading

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Citations

Apr 5, 2007·Chemical Communications : Chem Comm·Antoine BuchardPascal Le Floch
Aug 23, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Carly E AndersonJudith A K Howard
May 22, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·Anthony KermagoretPierre Braunstein
Oct 16, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·Rong GaoFosong Wang
May 20, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Kefeng WangWen-Hua Sun
Nov 15, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Carly E AndersonJudith A K Howard
Dec 17, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·Suyun JiePierre Braunstein
Jan 25, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·Anthony Kermagoret, Pierre Braunstein
Dec 22, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Kuifeng SongWen-Hua Sun
Aug 30, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Wen-Hua SunFosong Wang
Nov 4, 2009·Inorganic Chemistry·Riccardo PelosoPierre Braunstein

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