Towards selective ethylene tetramerization.

And the magic number is … 4! A large amount of oligomer-free 1-octene (99.9?%) was produced from ethylene by a catalytic system based on chromium during the formation of polyethylene wax [see GC–MS chromatogram; the other three significant peaks are methanol (quenching agent), ethyl acetate (needle-rinsing agent), and toluene (solvent)].

[1]  Mohammed H. Al-Hazmi,et al.  An alternative mechanistic concept for homogeneous selective ethylene oligomerization of chromium-based catalysts: binuclear metallacycles as a reason for 1-octene selectivity? , 2010, Chemistry.

[2]  T. Hor,et al.  Crystallographic Revelation of the Role of AlMe3 (in MAO) in Cr [NNN] Pyrazolyl Catalyzed Ethylene Trimerization , 2009 .

[3]  C. Mason,et al.  Isolation of single-component trimerization and polymerization chromium catalysts: the role of the metal oxidation state. , 2008, Angewandte Chemie.

[4]  R. Kempe,et al.  Metall-Metall-Abstände am Limit: ein Komplex mit ultrakurzer Cr-Cr-Bindung , 2008 .

[5]  F. Wagner,et al.  Metal-metal distances at the limit: a coordination compound with an ultrashort chromium-chromium bond. , 2008, Angewandte Chemie.

[6]  P. Braunstein,et al.  Highly Selective Chromium(III) Ethylene Trimerization Catalysts with [NON] and [NSN] Heteroscorpionate Ligands , 2008 .

[7]  N. Davies,et al.  Ethylene Oligomerization with Cr−NHC Catalysts: Further Insights into the Extended Metallacycle Mechanism of Chain Growth , 2008 .

[8]  Sai Zhang,et al.  The effect of N-aryl bisphosphineamine ligands on the selective ethylene tetramerization , 2008 .

[9]  T. Agapie,et al.  Mechanistic studies of olefin and alkyne trimerization with chromium catalysts: deuterium labeling and studies of regiochemistry using a model chromacyclopentane complex. , 2007, Journal of the American Chemical Society.

[10]  Z. Weng,et al.  Chromium(III) catalysed ethylene tetramerization promoted by bis(phosphino)amines with an N-functionalized pendant. , 2007, Dalton transactions.

[11]  Mingjian Luo,et al.  Performance of various aluminoxane activators in ethylene tetramerization based on PNP/Cr(III) catalyst system , 2007 .

[12]  P. Wasserscheid,et al.  The use of bis(diphenylphosphino)amines with N-aryl functionalities in selective ethylene tri-and tetramerisation , 2007 .

[13]  P. Wasserscheid,et al.  N-substituted diphosphinoamines: Toward rational ligand design for the efficient tetramerization of ethylene , 2007 .

[14]  A. Slawin,et al.  Ethylene Tri- and Tetramerization with Borate Cocatalysts: Effects on Activity, Selectivity, and Catalyst Degradation Pathways , 2007 .

[15]  Gang Wang,et al.  Preparation of 1-octene by the selective tetramerization of ethylene , 2006 .

[16]  S. Gambarotta,et al.  The question of the Cr oxidation state in the {Cr(SNS)} catalyst for selective ethylene trimerization: an unanticipated re-oxidation pathway. , 2006, Angewandte Chemie.

[17]  P. Wasserscheid,et al.  Influence of elevated temperature and pressure on the chromium-catalysed tetramerisation of ethylene , 2006 .

[18]  S. Gambarotta,et al.  Role of the metal oxidation state in the SNS-Cr catalyst for ethylene trimerization: isolation of di- and trivalent cationic intermediates. , 2006, Journal of the American Chemical Society.

[19]  David J. Jones,et al.  Experimental evidence for large ring metallacycle intermediates in polyethylene chain growth using homogeneous chromium catalysts. , 2005, Journal of the American Chemical Society.

[20]  B. Weckhuysen,et al.  Single-site heterogeneous Cr-based catalyst for the selective trimerisation of ethylene. , 2005, Chemical communications.

[21]  M. Döring,et al.  Chromium imine and amine complexes as homogeneous catalysts for the trimerisation and polymerisation of ethylene , 2005 .

[22]  P. Wasserscheid,et al.  Ethylene Trimerization with Mixed-Donor Ligand (N,P,S) Chromium Complexes: Effect of Ligand Structure on Activity and Selectivity , 2005 .

[23]  F. Cotton,et al.  Molecular and electronic structures by design: tuning symmetrical and unsymmetrical linear trichromium chains. , 2004, Journal of the American Chemical Society.

[24]  V. Gokul,et al.  Ethylene trimerisation catalyst based on substituted cyclopentadienes , 2003 .

[25]  S. Schwikkard,et al.  The Effect of Aromatic Ethers on the Trimerisation of Ethylene using a Chromium Catalyst and Aryloxy Ligands , 2003 .

[26]  P. Wasserscheid,et al.  First Cr(III)-SNS complexes and their use as highly efficient catalysts for the trimerization of ethylene to 1-hexene. , 2003, Journal of the American Chemical Society.

[27]  C. Hu,et al.  Novel Cr-PNP complexes as catalysts for the trimerisation of ethylene. , 2003, Chemical communications.

[28]  D. Wass,et al.  High activity ethylene trimerisation catalysts based on diphosphine ligands. , 2002, Chemical Communications.

[29]  P. Wasserscheid,et al.  Selective Trimerization of α-Olefins with Triazacyclohexane Complexes of Chromium as Catalysts. , 2000, Angewandte Chemie.

[30]  Peter Wasserscheid,et al.  Selektive Trimerisierung vonα-Olefinen mit Triazacyclohexan-Komplexen des Chroms als Katalysatoren , 2000 .

[31]  P. W. Jolly,et al.  The Role of Metallacycles in the Chromium-Catalyzed Trimerization of Ethylene , 1997 .

[32]  S. Gambarotta,et al.  Ligand steric bulk: A neglected factor in the formation of CrCr supershort contacts , 1993 .

[33]  S. Gambarotta,et al.  Short and Supershort Cr–Cr Distances: A Vanishing Borderline Between Metal–Metal Bonds, Magnetic Couplings and Ligand Artifacts , 1991 .

[34]  A. Orpen,et al.  Organometallic chemistry of chromium(VI): synthesis of chromium(VI) alkyls and their precursors. X-ray crystal structure of the metallacycle Cr(NBu-tert)2{o-(CHSiMe3)2C6H4} , 1990 .

[35]  J. R. Briggs.  The selective trimerization of ethylene to hex-1-ene , 1989 .

[36]  W. E. Walker,et al.  A soluble chromium-based catalyst for ethylene trimerization and polymerization , 1977 .

[37]  J. F. White,et al.  Thermal decomposition of bis(phosphine)platinum(II) metallocycles , 1976 .