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
S. Tripp
中科院分区:
化学3区
文献类型:
--
作者:
U. Siemeling;C. Färber;C. Bruhn;S. Fürmeier;T. Schulz;M. Kurlemann;S. Tripp

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本文主要研究了N-杂环卡宾(NHC)1-Np的配合物,该配合物含有1,1 ′-二茂铁二基主链和位于二价C原子两侧的N原子上的新戊基取代基。1-Np是一个环尺寸为6个原子的扩环NHC。通过1-Np分别与反式-[PdCl 2(PhCN)2]、[PdCl 2(PPh 3)2]、顺式-[PdCl 2(COD)](COD =环辛-1,5-二烯)和[NiCl 2(PPh 3)2]反应,合成了平面正方形的10族金属配合物[{PdCl(μ-Cl)(1-Np)}2]、cis-[PdCl 2(1-Np)(PPh 3)]、trans-[PdCl 2(1-Np)2]和trans-[NiCl 2(1-Np)(PPh 3)].此外,还意外地得到了卡宾-硼烷加合物1-Np-BF 3。所有新化合物的结构均通过单晶X射线衍射进行表征,这表明1-Np的明显反式影响。1-Np与扩环的NHC 1,3-二异丙基四氢嘧啶-2-亚基(THP-iPr)在均相催化的背景下进行了比较,其利用已知在NHC = THP-iPr的情况下特别有效的类似钯NHC络合物。在PhB(OH)2与溴代芳烃Br-p-C6 H4-R的Suzuki-Miyaura交叉偶联反应中,cis-[PdCl 2(1-Np)(PPh 3)]的催化性能与文献报道的cis-[PdCl 2(THP-iPr)(PPh 3)]相似。然而,对于芳基氯化物,后一种络合物比其1-Np类似物更上级。在丙烯酸正丁酯与溴代芳烃Br-p-C6 H4-R的Mizoroki-Heck反应中,反式-[PdCl 2(THP-iPr)2]的催化性能与反式-[PdCl 2(1-Np)2] [R = C(O)Me,OMe]相当或略好于后者。
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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