CSC-pincer versus pseudo-pincer complexes of palladium(ii): a comparative study on complexation and catalytic activities of NHC complexes†
Dan Yuan,Haoyun Tang,Linfei Xiao,Han Vinh Huynh
Dalton Transactions Pub Date : 04/27/2011 00:00:00 , DOI:10.1039/C1DT10269A
Abstract

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.

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