Influence of sterically demanding carbene ligation on catalytic behavior and thermal stability of ruthenium olefin metathesis catalysts

被引：235

作者：

Huang, JK ^{[1
]}

Schanz, HJ ^{[1
]}

Stevens, ED ^{[1
]}

Nolan, SP ^{[1
]}

机构：

[1] Univ New Orleans, Dept Chem, New Orleans, LA 70148 USA

来源：

ORGANOMETALLICS | 1999年 / 18卷 / 25期

关键词：

D O I：

10.1021/om990788y

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The exchange reaction of one phosphine ligand in Cl-2(PCy3)(2)Ru=CHPh (1; Cy = cyclohexyl, C6H11 with the sterically demanding carbene ligands 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene (IMes), 1,3-bis(4-methylphenyl)imidazol-2-yliden (ITol), and 1,3-bis(4-chlorophenyl)imidazol-2-ylidene (IpCl) leads to the isolation of the new complexes (PCy3)(IMes)Cl2Ru=CHPh (2), (PCy3)(ITol)Cl2Ru=CHPh (3), and (PCy3)(IpCl)Cl2Ru=CHPh (4). Similarly, one IMes ligand can be substituted for one PCyp(3) ligand in Cl-2(PCyp(3))(2)Ru=CHCH=C(CH3)(2) (5; Cyp = cyclopentyl, C5H9) to produce (PCyp(3))(IMes)Cl2Ru=CHPh (6) in high yield. X-ray structure analysis of 6 confirmed a near-square-pyramidal coordination sphere around the metal center. Improved catalytic properties and thermal stability are observed for 2 and 6 in comparison to the parent 1 and 5.

引用

页码：5375 / 5380

页数：6

共 39 条

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