The counterion influence on the CH-activation of methane by palladium(II) biscarbene complexes - structures, reactivity and DFT calculations

被引：93

作者：

Strassner, T ^{[1
]}

Muehlhofer, M ^{[1
]}

Zeller, A ^{[1
]}

Herdtweck, E ^{[1
]}

Herrmann, WA ^{[1
]}

机构：

[1] Tech Univ Munich, Inst Anorgan Chem, D-85747 Garching, Germany

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 2004年 / 689卷 / 08期

关键词：

CH-activation; palladium; N-heterocyclic carbene; methane; catalysis;

D O I：

10.1016/j.jorganchem.2004.02.013

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Novel bridged palladium(11) biscarbene complexes with different counterions are reported: 1, V-dimethyl-3,3'-methylene-4-diimidazolin-2,2'-diylidene palladium(II) bischloride (1) and bis(trifluoroacetate) (2) have been synthesized in good yields. Both complexes are active in the catalytic conversion of methane to methanol and show comparable activities to previously published NHC-catalysts. The results of the single-crystal X-ray structure determination of 1,1'-dimethyl-3,3'-methylene-4-diimidazolin-2,2'-diylidene palladium(II) bischloride (1) and 1,1'-dimethyl-3,3'-methylene-4-diimidazolin-2,2'-diylidene palladium (11) bis(trifluoroacetate) 2 confirmed the structural similarity to the known corresponding palladium bromide and iodide complexes. Since free 1,1'-dimethyl-R-3,3'-methylene-4-diimidazolin-2,2'-diylidene are only available in low yields these compounds have been synthesized via the bromide complex, exchanging the counterion by AgCF3COO or by exchanging the counterion of the imidazolium salt by NH4PF6. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：1418 / 1424

页数：7

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