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%。
A Practical Screening Strategy of Arsenic Ligands for a Transition-metal-catalyzed Reaction
Organoarsenic ligands were synthesized via a safe and easy procedure, superior to the conventional synthetic methodologies. Diiodophenylarsine was prepared in situ, and was readily converted to diarylphenylarsines. Pd-catalyzed Mizoroki–Heck reaction was investigated using the obtained arsenic ligands. It was found that bulky and electron-donating ligands were effective for the reaction, meaning that the success in the screening of arsenic ligand structures was based on the present facile strategy.
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
An ester appending multifunctional ionic liquid for Pd(II) catalyzed Heck reaction
作者:Anand D. Sawant、Dilip G. Raut、Nitin B. Darvatkar、Uday V. Desai、Manikrao M. Salunkhe
DOI:10.1016/j.catcom.2010.10.004
日期:2010.12
A basic, ester functionalized, imidazolium based ionic liquid (IL2), 3-Methyl-1-(ethoxycarbonylmethyl)imidazolium hydroxide was designed eyeing in situ generation and stabilization of palladiumnanoparticles for palladium catalyzed Heck reaction of haloarenes and olefins. This phosphine-free Pd-IL catalyst demonstrated excellent activity and reusability at relatively low reaction temperature (80 °C)