Palladacycles of unsymmetrical (N,C<sup>−</sup>,E) (E = S/Se) pincers based on indole: their synthesis, structure and application in the catalysis of Heck coupling and allylation of aldehydes
作者:Mahabir P. Singh、Fariha Saleem、Gyandshwar K. Rao、S. Kumar、Hemant Joshi、Ajai K. Singh
DOI:10.1039/c6dt00060f
日期:——
[Pd(L1/L2–H)Cl] (1/2), where they bind in a tridentate (N,C−,E) mode. L1 and L2, their aldehyde precursors and Pd(II)-complexes, 1 and 2, have been characterized by 1H, 13C1H} and 77Se1H} NMR and HR-MS. Palladium(II) complexes 1 and 2 and precursor aldehydes of L1 and L2 were verified using single crystal X-ray diffraction. The catalytic activities of complexes 1 and 2 were investigated for Heck coupling
通过1-(2-苯基硫烷基/硒代乙基)-1 H的缩合反应,首次合成具有吲哚核的不对称(N,C,E)型钳位配体前体[ L1和L2:E = S / Se] -吲哚-3-甲醛与苄胺。合成规程很容易,并且收率很高(> 85%)。L1和L2与四氯钯钠(反应II在CH存在下)3 COONa结果在配合物[钯(L1 / L2 -H)CL](1 / 2),在那里它们结合在三齿(N,C - ,E)模式。L1和L2,其醛前体和Pd(II)配合物1和2的特征在于1 H,13 C 1 H}和77 Se 1 H} NMR和HR-MS。使用单晶X射线衍射验证了钯(II)配合物1和2以及L1和L2的前体醛。研究了配合物1和2的催化活性,以进行醛的Heck偶联和烯丙基化。这两个反应分别需要配合物负载量为0.1–0.3和1 mol%。
Palladium salt and functional reduced graphene oxide complex: in situ preparation of a generally applicable catalyst for C–C coupling reactions
作者:Sheng Wang、Donghua Hu、Wenwen Hua、Jiangjiang Gu、Qiuhong Zhang、Xudong Jia、Kai Xi
DOI:10.1039/c5ra10585d
日期:——
A novel Pd catalyst was designed by affording Pd2+ salt on the surface of functional reduced graphene oxide (FRGO), providing a new cheap and stable in situ prepared palladiumcatalyst for C–C coupling reactions, including the Heck reaction, Suzuki reaction, C–H bond functionalization reactions of thiophenes, and terminal alkyne C–H activation and homocoupling.
been prepared. Treatment with norbornadiene in the presence of silver tetrafluoroborate has furnished the cationic mononuclear complexes [Pd(κ2‐C,P ‐ArXCH2PR2)(nbd)]BF4 as stable solids. These complexes and some of the bromide dimers have been used as catalytic precursors in the Mizoroki‐Heck reaction between bromobenzene and butyl acrylate. The complexes efficiently catalyse this transformation and important
制备了九个部分卤代的苄基膦Ar X CH 2 PR 2(Ar X = 3,6-二氯苯基,3,6-二氟苯基和3,4,5-三氟苯基; R = Ph,Cy,i Pr)并与钯反应乙酸,得到环金属化的二聚体[加入Pd(μ -OAc)(κ 2 - C,P -Ar X CH 2 PR 2)] 2。已使用溴化锂通过溴化物交换了乙酸酯桥,并且已对得到的二聚体进行了全面表征。非卤代膦PhCH 2 PR 2(R = Ph,iPr)也已经准备好了。处理中的四氟硼酸银的存在降冰片二烯提供装饰的阳离子单核配合物[钯(κ 2 - C,P -Ar X CH 2 PR 2)(NBD)] BF 4为稳定的固体。这些络合物和一些溴化物二聚体已被用作溴苯和丙烯酸丁酯之间的Mizoroki-Heck反应的催化前体。配合物有效地催化这种转化,并且根据配体发现活性的重要差异。通常,氟化膦比氯化类似物具有更多的活性体系。
Synthesis and Isolation of an Acyclic Tridentate Bis(pyridine)carbodicarbene and Studies on Its Structural Implications and Reactivities
作者:Yu-Chen Hsu、Jiun-Shian Shen、Bo-Chao Lin、Wen-Ching Chen、Yi-Tsu Chan、Wei-Min Ching、Glenn P. A. Yap、Chao-Ping Hsu、Tiow-Gan Ong
DOI:10.1002/anie.201406481
日期:2015.2.16
The simple synthetic development of acyclic pincer bis(pyridine)carbodicarbene is depicted herein. Presented is the first isolated structural pincer carbodicarbene with a C‐C‐C angle of 143°, larger than the monodentate framework. More importantly, theoretical analysis showed that this carbodicarbene embodies a more allene‐like character. Palladium complexes supported by this pincer ligand are active
Two Pd(II)–NHC complexes bearing benzimidazole and pyridine groups have been successfully prepared and fully characterized by NMR and X‐ray diffraction analysis. The structure of palladium complexes are a typical square‐planar with palladium surrounded by two pairs of trans‐arranged benzimidazole and carbene ligands. The Pd–NHC complexes have been proved to be a highly efficient catalyst for the Mizoroki–Heck