353493-58-0Relevant academic research and scientific papers
Synthesis and characterisation of neutral dialkylaluminium complexes stabilised by salicylaldiminato ligands, and their conversion to monoalkylaluminium cations
Cameron,Gibson,Redshaw,Segal,Solan,White,Williams
, p. 1472 - 1476 (2001)
Treatment of the salicylaldimine ligands 3,5-But2-2-(OH)C6 H2CHNR [R = 2,6-Me2C6H3 (1a), 2,6-Pri2C6H3 (1b), 3,5-(CF3)2
The orthopalladation dinuclear [Pd(L1)(μ-OAc)]2, [Pd(L2)(μ-OAc)]2 and mononuclear [Pd(L3)2] complexes with [N, C, O] or [N, O] containing ligands: Synthesis, spectral characterization, electrochemistry and catalytic properties
Kilic, Ahmet,Kilinc, Dilek,Tas, Esref,Yilmaz, Ismail,Durgun, Mustafa,Ozdemir, Ismail,Yasar, Sedat
experimental part, p. 697 - 706 (2010/04/25)
Treatment of the salicylaldimine ligands (L1H, L2H, L3H, L4H and L5H) with palladium(II) acetate in absolute ethanol gave the orthopalladation dinuclear [Pd(L1)(μ-OAc)]2, [Pd(L2)(μ-OAc)]2 and mononuclear [Pd(L3)2] with the tetradentate ligands [N, C, O] or [N, O] moiety. The ligands L1H and L2H are coordinated through the imine nitrogen and aromatic ortho carbon atoms, whereas the ligand L3H coordinated through the imine nitrogen and phenolic oxygens atoms. The Pd(II) complexes have a square-planar structure and were found to be effective catalysts for the hydrogenation of both nitrobenzene and cyclohexene. These metal complexes were also tested as catalysts in Suzuki-Miyaura coupling of aryl bromide in the presence of K2CO3. The catalytic studies showed that the introduction of different groups on the salicyl ring of the molecules effected the catalytic activity towards hydrogenation of nitrobenzene and cyclohexene in DMF at 25 and 45 °C. The Pd(II) complexes easily prepared from cheap materials could be used as versatile and efficient catalysts for different C-C coupling reactions (Suzuki-Miyaura reactions). The structure of ligands and their complexes was characterized by UV-Vis, FT-IR, 1H and 13C NMR, elemental analysis, molar conductivity, as well as by electrochemical techniques.
Syndiospecific living catalysts for propylene polymerization: Effect of fluorination on activity, stereoselectivity, and termination
Mason, Andrew F.,Tian, Jun,Hustad, Philip D.,Lobkovsky, Emil B.,Coates, Geoffrey W.
, p. 301 - 306 (2007/10/03)
The polymerization of propylene using a variety of fluorinated bis(phenoxyimine)titanium complexes is reported. The synthesis of ten complexes containing varying fluorinated N-aryl substituents is described. X-ray structural and solution NMR data indicate that these complexes are C 2-symmetric in the solid state, although in some cases C 1-symmetric isomers are observed in solution. When activated with methylalumoxane, all complexes formed syndiotactic polypropylene. Catalysts with ortho-fluorine substituents formed polymers with very narrow molecular weight distributions, indicative of a living polymerization. Catalysts with fluorine in at least the ortho and para positions exhibited the highest syndiospecificities. Catalysts with meta- or para-fluorine-containing substituents were more active for propylene polymerization than the corresponding non-fluorinated catalyst.
