Oligomerization of α-olefins by the dimeric nickel bisamido complex [Ni{1-N(PMes2)-2-N(μ-PMes2)C6H4-κ3N,N′,P,-κ1P′}]2 activated by methylalumoxane (MAO)
摘要:
l The reaction of Li-2[1,2-{N(PMes(2))}(2)C6H4], formed in situ from n-BuLi and the corresponding amines, with 1 equiv. of [NiBr2(DME)] gives [Ni{1-N(PMes(2))-2-N(mu-PMes(2))C6H4-kappa N-3,N',P-kappa P-1'}](2) (1). After activation by methylalumoxane (MAO), 1 is a highly active catalyst in the oligomerization and isomerization of alpha-olefins such as ethene, propene, isobutene, 1-hexene and 1,5-hexadiene. For ethene oligomerization turnover frequencies (TOFs) range from 3000 to 79015 h (1), depending on the reaction conditions. The TOF for propene oligomerization reaches 1190730 h (1). To our knowledge, catalyst 1, activated by MAO, is the most active catalyst for the oligomerization of propene and outperforms the best known complexes for this reaction. In the reactions with 1-hexene, 1,5-hexadiene and isobutene dimerization and isomerization products were observed. (C) 2008 Elsevier B.V. All rights reserved.
Oligomerization of α-olefins by the dimeric nickel bisamido complex [Ni{1-N(PMes2)-2-N(μ-PMes2)C6H4-κ3N,N′,P,-κ1P′}]2 activated by methylalumoxane (MAO)
作者:Felicite Majoumo-Mbe、Peter Lönnecke、Victoria Volkis、Manab Sharma、Moris S. Eisen、Evamarie Hey-Hawkins
DOI:10.1016/j.jorganchem.2008.05.004
日期:2008.7
l The reaction of Li-2[1,2-N(PMes(2))}(2)C6H4], formed in situ from n-BuLi and the corresponding amines, with 1 equiv. of [NiBr2(DME)] gives [Ni1-N(PMes(2))-2-N(mu-PMes(2))C6H4-kappa N-3,N',P-kappa P-1'}](2) (1). After activation by methylalumoxane (MAO), 1 is a highly active catalyst in the oligomerization and isomerization of alpha-olefins such as ethene, propene, isobutene, 1-hexene and 1,5-hexadiene. For ethene oligomerization turnover frequencies (TOFs) range from 3000 to 79015 h (1), depending on the reaction conditions. The TOF for propene oligomerization reaches 1190730 h (1). To our knowledge, catalyst 1, activated by MAO, is the most active catalyst for the oligomerization of propene and outperforms the best known complexes for this reaction. In the reactions with 1-hexene, 1,5-hexadiene and isobutene dimerization and isomerization products were observed. (C) 2008 Elsevier B.V. All rights reserved.