- Biphasic ethylene oligomerization using bis(imino)pyridine cobalt complexes in methyl-butylimidazolium organochloroaluminate ionic liquids
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Several bis(imino)pyridine cobalt (II) complexes have been synthesized and used in ethylene oligomerization in 1-methyl-3-butylimidazolium tetrachloroaluminate (BMI·AlCl4) ionic liquid activated by methylaluminoxane (MAO). The ligand substituti
- Thiele, Daniel,De Souza, Roberto Fernando
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experimental part
p. 83 - 88
(2011/06/27)
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- Highly trans-1,4 selective polymerization of 1,3-butadiene initiated by iron(III) bis(imino)pyridyl complexes
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A series of 2,6-bis(imino)pyridyl iron(III) complexes of the general formula [2,6-(ArNCMe)2C5H3N]FeCl3 (Ar = -C6H5, 3a; 2-MeC6H4, 3b; 2-EtC6H4, 3c; 2-iPrC6H4, 3d; cyclohexyl, 3e; 4-MeC6H4, 3f; 4-iPrC 6H4, 3g; 4-FC6H4, 3h and 4-CF 3C6H4, 3i), activated by alkylaluminum, MAO or MMAO, have been investigated in 1,3-butadiene polymerization. Iron(III) complex (3a), with the least steric hindrance around the metal center, gives polymer up to 99% in yield in 4 h (butadiene to iron ratio = 1000), and trans-1,4 selectivity about 94.7% at room temperature in toluene, while those (3b-3d) bearing alkyl substituents at the 2-position of each N-aryl ring exhibit much lower catalytic activity and tunable trans-1,4 selectivity. Introduction of an alkyl group at the 4-position (para-position, 3f and 3g) exerts a slightly beneficial effect on the trans-1,4 selectivity, while electronegative groups at the same position (3h and 3i) affect negatively on the activity. The effects of temperature, types of cocatalyst and Al/Fe molar ratio on the polymerization behavior are investigated. More importantly, a mechanism for forming trans-1,4 structure is also proposed. Crown Copyright
- Gong, Dirong,Jia, Xiaoyu,Wang, Baolin,Wang, Feng,Zhang, Chunyu,Zhang, Xuequan,Jiang, Liansheng,Dong, Weiming
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body text
p. 47 - 53
(2011/08/22)
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- Highly active and selective ethylene oligomerization catalysts: Asymmetric 2,6-bis(imino)pyridyl iron (II) complexes with alkyl and halogen substitutients
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A series of asymmetric 2,6-bis(arylimino)pyridines with alkyl and halogen substitutients on different iminoaryl rings and corresponding iron (II) complexes ([2-(Ar1N = CCH3)-6-(Ar2N = CCH 3)C5H3
- Xie, Guangyong,Li, Tingcheng,Zhang, Aiqing
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scheme or table
p. 1199 - 1202
(2011/01/11)
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- Syntheses, structures, and luminescent properties of copper(II) complexes based on 2,6-bis(imino)pyridyl ligands
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A series of five-coordinated 2,6-bis(imino)pyridyl Cu(II) complexes, [2,6-(ArNCMe)2C5H3NCuCl2· nCH3CN] (Ar = 4-MeC6H4, n = 0.5, Cu1; Ar = 2,6-Et2C6H3/
- Fan, Rui-Qing,Wang, Ping,Yang, Yu-Lin,Zhang, Yan-Jiao,Yin, Yan-Bing,Hasi, Wuliji
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scheme or table
p. 2862 - 2866
(2011/01/07)
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- Selective coupling of terminal olefins with ethylene to manufacture linear alpha-olefins
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A process for producing a linear α-olefin which comprises: reacting a stoichiometric excess of a terminal Cn olefin with ethylene in the presence of an organometallic catalyst to produce a Cn+2 linear α-olefin, wherein the catalyst i
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- Manufacture of alpha -olefins
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Alpha-olefins are manufactured in high yield and with very high selectivity by contacting ethylene with an iron complex of a selected 2,6-pyridinedicarboxaldehyde bisimine or a selected 2,6-diacylpyridine bisimine, and in some cases a selected activator c
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