Transformation of 2-alkoxyimidate-1,10-phenanthroline metal (Mn2+, Co2+ and Ni2+) chlorides from bis(2-cyano-1,10-phenanthroline) metal chlorides: Syntheses, characterizations and their catalytic behavior toward ethylene oligomerization

Recent progress on nickel-based systems for ethylene oligo-/polymerization catalysis

“…and the methyl substituted 89d showed the highest activity at 4.71 × 10 5 gmol -1 (Ni)h -1 over 60 min. 92 Scheme 53 N,N,N-tri-dentate nickel complexes 90 93 We have also studied the properties of ethylene oligomerization by the nickel complexes 90 (Scheme 53) bearing a 2-alkoxyimidate-1,10-phenanthroline at each metal. 93 In the presence of Et 2 AlCl, the methoxyimidate nickel complex 90 gave moderate to good activities and produced butenes and hexenes.…”

“…92 Scheme 53 N,N,N-tri-dentate nickel complexes 90 93 We have also studied the properties of ethylene oligomerization by the nickel complexes 90 (Scheme 53) bearing a 2-alkoxyimidate-1,10-phenanthroline at each metal. 93 In the presence of Et 2 AlCl, the methoxyimidate nickel complex 90 gave moderate to good activities and produced butenes and hexenes. For instance, in the presence of 200 equivalents of Et 2 AlCl at 1 atm of ethylene pressure, the nickel complex 90 exhibited the highest activity at 3.23 × 10 5 g mol -1 h -1 for ethylene oligomerization with a selectivity of 19.1 % for 1-butene.…”

“…When the ethylene pressure was increased to 10 atm from 1 atm, the catalytic activity of complex 90 increased to 8.71 × 10 5 g mol -1 h -1 with 84.1 % selectivity for 1-butene. 93 Scheme 54 N,N,N-tri-dentate nickel complexes 91 94 We have also investigated the properties of ethylene oligomerization by nickel complexes of the type 91 (Scheme 54) bearing 2-(benzimidazol-2-yl)-1,10phenanthrolines. 94 Upon activation with diethylaluminum chloride (Et 2 AlCl), high catalytic activity of up to 1.27×10 7 g•mol -1 (Ni)•h -1 and high selectivity for 1-butene (90.5 %) could be achieved.…”

Ruthenium(II) complex catalysts bearing a pyridyl-supported pyrazolyl-imine ligand for transfer hydrogenation of ketones

“…Planar tridentate NNN ligands have recently been paid much attention due to their potential applications in homogeneous catalysis, organic synthesis, materials and physical chemistry [13][14][15]. However, examples of unsymmetrical planar tridentate NNN ligands and their transition metal complexes have only been scattered [16][17][18][19][20]. Recently, we found that phosphinefree unsymmetrical pyridyl-supported 2,6-(mixed N-heterocycles) ligands can demonstrate a dynamic ''on and off" chelating effect for the metal center during catalysis, and their transition metal complexes usually exhibit enhanced catalytic activity and selectivity [21][22][23][24][25][26].…”

Synthesis and ethylene oligomerization behavior of trinuclear nickel complex with phosphorus dendrimer

“…Xiao and co-workers developed bis-chelate and binuclear nickel complexes based on 2-alkoxyimidate-1,10-phenanthroline derivatives, and the results showed that the catalytic activity (3.23 × 10 5 g/ (mol Nih)) of the binuclear complex was far higher than the bis-chelate complex. In addition, the nickel complex exhibited high selectivity toward butene with 83.4% and the selectivity of 19.1% for 1-butene [19]. Chen and co-workers synthesized a series of binuclear nickel catalysts based on dinucleating α-diimine ligands and investigated the catalytic properties in ethylene polymerization, and the results indicated that the naphthalene-bridged α-diimine binuclear nickel complex showed higher catalytic activity of 4.64 × 10 6 g/(mol Ni h) in ethylene polymerization comparing with the mononuclear analog [20].…”