Group 10 Metal Complexes of a Ferrocene-Based N-Heterocyclic Carbene: Syntheses, Structures and Catalytic Applications†
Group 10 Metal Complexes of a Ferrocene-Based N-Heterocyclic Carbene: Syntheses, Structures and Catalytic Applications†
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基于二茂铁的 N-杂环卡宾的第 10 族金属配合物:合成、结构和催化应用â
DOI:
10.1002/ejic.201100856
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发表时间:
2012
影响因子:
2.3
通讯作者:
S. Tripp
中科院分区:
文献类型:
--
作者:
U. Siemeling;C. Färber;C. Bruhn;S. Fürmeier;T. Schulz;M. Kurlemann;S. Tripp
This paper focuses on complexes of the N‐heterocyclic carbene (NHC)1‐Np, which contains a 1,1′‐ferrocenediyl backbone and neopentyl substituents at the N atoms flanking the divalent C atom.1‐Np is a ring‐expanded NHC with a ring size of six atoms. The square‐planar group 10 metal complexes [{PdCl(μ‐Cl)(1‐Np)}2],cis‐[PdCl2(1‐Np)(PPh3)],trans‐[PdCl2(1‐Np)2] andtrans‐[NiCl2(1‐Np)(PPh3)] have been prepared by the reaction of1‐Np withtrans‐[PdCl2(PhCN)2], [PdCl2(PPh3)2],cis‐[PdCl2(COD)] (COD = cycloocta‐1,5‐diene) and [NiCl2(PPh3)2], respectively. In addition, the carbene–borane adduct1‐Np–BF3has been obtained by serendipity. All new compounds have been structurally characterised by single‐crystal X‐ray diffraction, which demonstrates the pronouncedtransinfluence of1‐Np.1‐Np has been compared with the ring‐expanded NHC 1,3‐diisopropyltetrahydropyrimid‐2‐ylidene (THP‐iPr) in the context of homogeneous catalysis, which utilises analogous palladium NHC complexes known to be particularly effective in the case of NHC = THP‐iPr. The catalytic performance ofcis‐[PdCl2(1‐Np)(PPh3)] in Suzuki–Miyaura cross‐coupling reactions of PhB(OH)2with aryl bromides Br–p‐C6H4–R is similar to that reported forcis‐[PdCl2(THP‐iPr)(PPh3)]. With aryl chlorides, however, the latter complex is superior to its1‐Np analogue. The catalytic performance reported fortrans‐[PdCl2(THP‐iPr)2] in Mizoroki–Heck reactions ofn‐butyl acrylate with aryl bromides Br–p‐C6H4–R is equal to (R = H) or moderately better than that oftrans‐[PdCl2(1‐Np)2] [R = C(O)Me, OMe].
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影响因子:
4
作者:
Hans‐Joachim Hübschmann
通讯作者:
Hans‐Joachim Hübschmann
DOI:
10.1039/dt9730000906
发表时间:
1973
期刊:
Journal of The Chemical Society-dalton Transactions
影响因子:
--
作者:
B. etinkaya;Engin C etinkaya;M. Lappert
通讯作者:
M. Lappert
影响因子:
3.9
作者:
F. Diederich;Peter J. Stang
通讯作者:
F. Diederich;Peter J. Stang
影响因子:
2.8
作者:
Javier A. Cabeza;I. D. Rı́o;E. Pérez;Vanessa Pruneda
通讯作者:
Vanessa Pruneda
影响因子:
--
作者:
R. W. Alder;Michael E. Blake;L. Chaker;Jeremy N. Harvey;François Paolini;Jana Schütz
通讯作者:
Jana Schütz