Highly Active Pd(II) Catalysts with <i>trans</i>-Bidentate Pyridine Ligands for the Heck Reaction
作者:Tomikazu Kawano、Tatsuji Shinomaru、Ikuo Ueda
DOI:10.1021/ol026161k
日期:2002.7.1
[reaction: see text] The air-, water-, and heat-stable palladium(II) complexes 2a and 2b are prepared by the reaction of palladium(II) salts with the new trans-bidentate nitrogen ligands, 1,2-bis(2-pyridylethynyl)benzenes. The structure of complex 2a has been confirmed by X-ray structure analysis. The complexes efficiently catalyze the Heck olefination of aryl iodides and provide a good yield under
作者:Alavi Karim、Nils Schulz、Hanna Andersson、Bijan Nekoueishahraki、Anna-Carin C. Carlsson、Daniel Sarabi、Arto Valkonen、Kari Rissanen、Jürgen Gräfenstein、Sandro Keller、Máté Erdélyi
DOI:10.1021/jacs.8b09367
日期:2018.12.19
analogous halogen bond. The necessity of the involvement of a bidentate Lewis base in its formation is demonstrated by providing spectroscopic and crystallographic evidence that a monodentate Lewis base induces a reaction rather than stabilizing the tetrel bond complex. A vastly decreased Lewis basicity of the bidentate ligand or reduced Lewis acidity of the carbenium ion weakens-or even prohibits-the formation
Catalytic Activity of <i>trans</i>-Bis(pyridine)gold Complexes
作者:Ann Christin Reiersølmoen、Dániel Csókás、Sigurd Øien-Ødegaard、Alan Vanderkooy、Arvind Kumar Gupta、Anna-Carin C. Carlsson、Andreas Orthaber、Anne Fiksdahl、Imre Pápai、Máté Erdélyi
DOI:10.1021/jacs.0c01941
日期:2020.4.1
the reactivity of bis(pyridine)-ligated Au(III) complexes is presented, based on NMR spectroscopic, X-ray crystallographic, and DFT data. The electron density of pyridines modulates the catalytic activity of Au(III) complexes in propargyl ester cyclopropanation of styrene. To avoid strain induced by a ligand with a nonoptimal nitrogen–nitrogen distance, bidentate bis(pyridine)–Au(III) complexes convert
作者:Roland Kleinmaier、Sven Arenz、Alavi Karim、Anna-Carin C. Carlsson、Máté Erdélyi
DOI:10.1002/mrc.3907
日期:2013.1
solvent and substituents on Δ15Ncoord. The comparative study of CDCl3 and CD3CN solutions of silver(I)‐bis(pyridine) and silver(I)‐bis(pyridylethynyl)benzene complexes revealed the strong solvent dependence of their 15N NMR chemicalshift, with a solvent dependent variation of up to 40 ppm for one and the same complex. The primary influence of the effect of substituent and counter ion on the 15N NMR chemical
Substituent Effects on the [N–I–N]<sup>+</sup> Halogen Bond
作者:Anna-Carin C. Carlsson、Krenare Mehmeti、Martin Uhrbom、Alavi Karim、Michele Bedin、Rakesh Puttreddy、Roland Kleinmaier、Alexei A. Neverov、Bijan Nekoueishahraki、Jürgen Gräfenstein、Kari Rissanen、Máté Erdélyi
DOI:10.1021/jacs.6b03842
日期:2016.8.10
by computation of the natural atomic population and the π electron population of the nitrogen atoms. Formation of the [N–I–N]+ halogen bond resulted in >100 ppm 15N NMR coordination shifts. Substituenteffects on the 15N NMR chemical shift are governed by the π population rather than the total electron population at the nitrogens. Isotopic perturbation of equilibrium NMR studies along with computation