Dimerization of ethylene and propylene catalyzed by transition-metal complexes

Pillai, Saju; Ravindranathan, M.; Sivaram, S.

doi:10.1021/cr00072a004

Cited by 192 publications

(71 citation statements)

References 44 publications

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“…Recently cationic Ni(II) a-diimine complexes were reported to be highly effective as ethylene oligomerization catalysts [8]. Moreover, high-performance from Ni catalysts to selectively produce oligomers can be obtained via tailoring of the surrounding ligands [9,10].…”

Section: Introductionmentioning

confidence: 99%

Ethylene Oligomerizations by Sterically Modulated Salicylaldimine Cobalt(II) Complexes Combined with Various Alkyl Aluminum Cocatalysts

Chandran

Kwak

et al. 2008

Catal Lett

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A set of structurally modulated salicylaldimine cobalt(II) complexes have been synthesized and utilized them for ethylene oligomerizations in combination with various organoaluminum cocatalysts. All catalyst systems yielded a-olefins with butenes as major product. The catalytic activity and product distribution were affected by the catalytic structure and reaction conditions. The formation of active species in these complexes under oligomerization conditions was investigated by UV-VIS spectroscopy and the results matched well with oligomerization results.

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Section: Introductionmentioning

confidence: 99%

Ethylene Oligomerizations by Sterically Modulated Salicylaldimine Cobalt(II) Complexes Combined with Various Alkyl Aluminum Cocatalysts

Chandran

Kwak

et al. 2008

Catal Lett

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“…Numerous authenticated examples of transition-metal ethylene complexes [1] are known today. Considerable focus has been placed on nickel complexes, because they represent key intermediates responsible for the "nickel effect".…”

Section: Introductionmentioning

confidence: 99%

The Electronic Structure of the Tris(ethylene) Complexes [M(C₂H₄)₃] (M=Ni, Pd, and Pt): A Combined Experimental and Theoretical Study

Hebben

Himmel

Eickerling

et al. 2007

Chemistry A European J

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In this article we analyze in detail the electronic properties of the D(3h)-symmetric tris(ethylene) complexes of nickel, palladium, and platinum ([M(C(2)H(4))(3)] M=Ni, Pd, Pt). In the case of [Pd(C(2)H(4))(3)] the analysis is based on new experimental IR and Raman spectra for the matrix-isolated molecules and in all cases on the results of quantum-chemical (DFT) calculations. The experimental spectra collected for [Pd(C(2)H(4))(3)] provide evidence for several previously unobserved vibrational modes, including the in-phase and out-of-phase nu(C-C) and delta(CH(2)) modes, and the in-phase nu(M-C) mode. Special consideration is given to possible inter-ligand interactions. The interaction force constant f(CC,CC) between two C(2)H(4) ligands can be directly estimated from the spectra, and its very small value (0.002 N m(-1)) indicates the absence of any significant inter-ligand interaction. An analysis of the topology of the theoretical electron density distribution, rho(r), and the corresponding Laplacian, nabla(2)rho(r), for [Pd(C(2)H(4))(3)] and its lighter and heavier homologues [Ni(C(2)H(4))(3)] and [Pt(C(2)H(4))(3)], respectively, is in full agreement with the conclusions drawn from the experimental results. The combined experimental and quantum-chemical results provide detailed insights in the electronic properties of these prototypical ethylene complexes.

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“…It is well known that [NiCl 2 (phosphane) 2 ] complexes constitute good precatalysts for the oligomerisation or polymerisation of olefins, the outcome of the reaction being strongly dependent on the nature of the phosphane. [26,27] Thus for example, [NiCl 2 (PCy 3 ) 2 ] activated with AlEt 2 Cl becomes a highly selective ethylene dimerisation catalyst. [28] A typical activity for this complex is 1600…”

Section: Resultsmentioning

confidence: 99%

Coordination Chemistry of Large Diphosphanes − Directional Properties of a Calix[4]arene Proximally Substituted by Two −OCH₂PPh₂ Podand Arms

et al. 2004

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The proximally-functionalised calixarene 5,11,17,23-tetratert-butyl-25,26-bis(diphenylphosphanylmethoxy)-27,28-dihydroxycalix[4]arene (1), a large diphosphane in which the P III centres are separated by 10 bonds, behaves as a chelating ligand towards NiX 2 moieties (X = Cl, Br). As shown by three X-ray studies carried out on complexes of the type [NiX 2 ·1], the diphosphane is able to accommodate either tetrahedral or strongly distorted tetrahedral coordination geometries, but

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Dimerization of ethylene and propylene catalyzed by transition-metal complexes

Cited by 192 publications

References 44 publications

Ethylene Oligomerizations by Sterically Modulated Salicylaldimine Cobalt(II) Complexes Combined with Various Alkyl Aluminum Cocatalysts

Ethylene Oligomerizations by Sterically Modulated Salicylaldimine Cobalt(II) Complexes Combined with Various Alkyl Aluminum Cocatalysts

The Electronic Structure of the Tris(ethylene) Complexes [M(C₂H₄)₃] (M=Ni, Pd, and Pt): A Combined Experimental and Theoretical Study

Coordination Chemistry of Large Diphosphanes − Directional Properties of a Calix[4]arene Proximally Substituted by Two −OCH₂PPh₂ Podand Arms

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Dimerization of ethylene and propylene catalyzed by transition-metal complexes

Cited by 192 publications

References 44 publications

Ethylene Oligomerizations by Sterically Modulated Salicylaldimine Cobalt(II) Complexes Combined with Various Alkyl Aluminum Cocatalysts

Ethylene Oligomerizations by Sterically Modulated Salicylaldimine Cobalt(II) Complexes Combined with Various Alkyl Aluminum Cocatalysts

The Electronic Structure of the Tris(ethylene) Complexes [M(C2H4)3] (M=Ni, Pd, and Pt): A Combined Experimental and Theoretical Study

Coordination Chemistry of Large Diphosphanes − Directional Properties of a Calix[4]arene Proximally Substituted by Two −OCH2PPh2 Podand Arms

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The Electronic Structure of the Tris(ethylene) Complexes [M(C₂H₄)₃] (M=Ni, Pd, and Pt): A Combined Experimental and Theoretical Study

Coordination Chemistry of Large Diphosphanes − Directional Properties of a Calix[4]arene Proximally Substituted by Two −OCH₂PPh₂ Podand Arms