Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/69280
標題: Preparation of cobalt sandwich diphosphine ligand (eta(5)-(C5H4Pr)-Pr-i)Co(eta(4)-C-4(PPh2)(2)Ph-2) and its chelated palladium complex: Application of diphosphine ligand in the preparation of mono-substituted ferrocenylarenes
作者: Chang, C.P.
Weng, C.M.
Hong, F.E.
關鍵字: Suzuki-Miyaura reaction
Ferrocenylboronic acid
dppf
Cobalt-containing
phosphine
DFT
cross-coupling reactions
transition-metal-complexes
n-heterocyclic
carbenes
catalyzed c-c
suzuki-miyaura
aryl chlorides
room-temperature
reductive elimination
molecular-structures
efficient
catalyst
期刊/報告no:: Inorganica Chimica Acta, Volume 363, Issue 2, Page(s) 412-417.
摘要: The reaction of (eta(5)-(C5H4Pr)-Pr-i)Co(PPh3)(2) with PhC CPPh2 furnished two isomeric cyclobutadiene-substituted Cp'CoCb diphosphines, [(eta(5)-(C5H4Pr)-Pr-i)Co(eta(4)-1,2-(PPh2)(2)C4Ph2)] (5-cis) and [(eta(5)-(C5H4Pr)-Pr-i)Co(eta(4)-1,3(PPh2)(2)C4Ph2)] (5-trans). Further reaction of 5-cis with one molar equivalent of Pd(COD)Cl-2 gave palladium complex [(eta(5)-(C5H4Pr)-Pr-i)Co(eta(4)-1,2-(PPh2)(2)C4Ph2)-PdCl2] (6) in good yield. Both of the molecular structures of 5-cis and 6 were determined by single-crystal X-ray diffraction methods. Unexpectedly, the palladium complex 6 was found to be more efficient than the combination of the commonly used Buchwald's ligand, biphenyl-2-yl-di-tert-butyl-phosphane, with Pd(OAc)(2) as the catalytic precursor in the Suzuki-Miyaura reaction between ferroceneboronic acid and 4-bromoaldehyde. The X-ray structural analysis and DFT study of several palladium complexes containing sandwich-type diphosphine chelating ligands revealed that the variations in bite angles are much larger than those in bite distances. The more energetically favorable conformation in the Pd(II) complexes is the one with bite angle close to 90 degrees. (C) 2009 Elsevier B. V. All rights reserved.
URI: http://hdl.handle.net/11455/69280
ISSN: 0020-1693
文章連結: http://dx.doi.org/10.1016/j.ica.2009.11.010
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