Novel hemi-labile pyridyl-imine palladium complexes: Synthesis, molecular structures and reactions with ethylene
摘要:
Ligands (2-pyridyl-2-furylmethyl)imine, (L1), (2-pyridyl-2-thiophenemethyl)imine (12), and (2-pyridyl-2-thiopheneethyl)imine (L3) were synthesized by condensation reactions and obtained in good yields. Reactions of L1-L3 with either [PdClMe(cod)] or [PdCl2(cod)] gave the corresponding monometallic palladium(II) complexes 1-5 in very good yields. Molecular structures of complexes 1,4 and 5 indicated that the ligands are bidentate and coordinate to the palladium metal through the imine and pyridine nitrogen atoms. When complexes 3-5 were treated with NaBAr4, cationic species, 3a, 4a, and 5a were produced which catalyzed polymerization of ethylene though with very low activities. H-1 NMR spectroscopy studies showed that these cationic species were very stable in solution. DFT calculations showed high ethylene coordination barriers to the cationic species 3a, 4a and 5a. (C) 2011 Elsevier Ltd. All rights reserved.
Novel hemi-labile pyridyl-imine palladium complexes: Synthesis, molecular structures and reactions with ethylene
摘要:
Ligands (2-pyridyl-2-furylmethyl)imine, (L1), (2-pyridyl-2-thiophenemethyl)imine (12), and (2-pyridyl-2-thiopheneethyl)imine (L3) were synthesized by condensation reactions and obtained in good yields. Reactions of L1-L3 with either [PdClMe(cod)] or [PdCl2(cod)] gave the corresponding monometallic palladium(II) complexes 1-5 in very good yields. Molecular structures of complexes 1,4 and 5 indicated that the ligands are bidentate and coordinate to the palladium metal through the imine and pyridine nitrogen atoms. When complexes 3-5 were treated with NaBAr4, cationic species, 3a, 4a, and 5a were produced which catalyzed polymerization of ethylene though with very low activities. H-1 NMR spectroscopy studies showed that these cationic species were very stable in solution. DFT calculations showed high ethylene coordination barriers to the cationic species 3a, 4a and 5a. (C) 2011 Elsevier Ltd. All rights reserved.
the preparation of a variety of biologically interesting amido (thio)xanthates has been developed. By the proper choice of a potassium (thio)xanthate salt, a cyclic or acyclic imine, and an acyl chloride as substrates a broad scope with respect to the substituents can be realized. This operationally simple one-pot method proceeds under mild and environmentally friendly conditions while potassium chloride
[EN] HETEROAROMATIC RING TRIDENTATE PYRIDINE IMINE IRON COMPLEX, PREPARATION METHOD THEREFOR, AND APPLICATION THEREOF IN CATALYSIS OF CONJUGATED DIENE POLYMERIZATION<br/>[FR] COMPLEXE DE PYRIDINE IMINE FER TRIDENTATE À NOYAU AROMATIQUE À HÉTÉROATOME, PROCÉDÉ DE PRÉPARATION S'Y RAPPORTANT ET SON APPLICATION EN CATALYSE DE POLYMÉRISATION DE DIÈNES CONJUGUÉS<br/>[ZH] 一种杂芳环三齿吡啶亚胺铁配合物及其制备方法和其在催化共轭二烯聚合中的应用
Novel hemi-labile pyridyl-imine palladium complexes: Synthesis, molecular structures and reactions with ethylene
作者:William M. Motswainyana、Stephen O. Ojwach、Martin O. Onani、Emmanuel I. Iwuoha、James Darkwa
DOI:10.1016/j.poly.2011.07.004
日期:2011.9
Ligands (2-pyridyl-2-furylmethyl)imine, (L1), (2-pyridyl-2-thiophenemethyl)imine (12), and (2-pyridyl-2-thiopheneethyl)imine (L3) were synthesized by condensation reactions and obtained in good yields. Reactions of L1-L3 with either [PdClMe(cod)] or [PdCl2(cod)] gave the corresponding monometallic palladium(II) complexes 1-5 in very good yields. Molecular structures of complexes 1,4 and 5 indicated that the ligands are bidentate and coordinate to the palladium metal through the imine and pyridine nitrogen atoms. When complexes 3-5 were treated with NaBAr4, cationic species, 3a, 4a, and 5a were produced which catalyzed polymerization of ethylene though with very low activities. H-1 NMR spectroscopy studies showed that these cationic species were very stable in solution. DFT calculations showed high ethylene coordination barriers to the cationic species 3a, 4a and 5a. (C) 2011 Elsevier Ltd. All rights reserved.