CSC-pincer versus pseudo-pincer complexes of palladium(II): a comparative study on complexation and catalytic activities of NHC complexes

Three thioether bridged diimidazolium dibromides with different steric and electronic properties have been synthesized as precursors to carbene-based CSC pincer ligands. Palladation afforded CSC Pd(II) pincer complexes for bulky and electron rich ligand systems, whereas the least donating ligand led...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2011-01, Vol.40 (35), p.8788-8795
Main Authors: Yuan, Dan, Tang, Haoyun, Xiao, Linfei, Huynh, Han Vinh
Format: Article
Language:English
Subjects:
Alkynes
Catalytic activity
Complexation
Diffraction
Ligands
NMR spectroscopy
Precursors
X-rays
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Summary:Three thioether bridged diimidazolium dibromides with different steric and electronic properties have been synthesized as precursors to carbene-based CSC pincer ligands. Palladation afforded CSC Pd(II) pincer complexes for bulky and electron rich ligand systems, whereas the least donating ligand led to the formation of a pseudo-pincer complex. All complexes have been fully characterized by multinuclei NMR spectroscopies, ESI mass spectrometry and X-ray diffraction analysis. The catalytic activities of pincer versus pseudo-pincer complexes have been compared in the intermolecular hydroamination of alkynes with anilines as well.
ISSN:1477-9226
1477-9234
DOI:10.1039/c1dt10269a