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Issue 35, 2009
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Syntheses and catalytic activities of pseudo-pincer and CSC pincer-type Pd(II) complexes derived from benzannulated N-heterocyclic carbenes

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Abstract

Three new dibenzimidazolium salts bearing thioether (2HBr, B·2HNO3) and sulfoxide (2HBr) containing bridges have been synthesized as sulfur-functionalized dicarbene precursors. Palladation of 2HBr and 2HBr afforded two new pseudo-pincer complexes cis-[PdBr2(B-κ2C)] (1) and cis-[PdBr2(C-κ2C)] (2), in which the sulfur-donor remains pendant. Reaction of precursor B·2HNO3 in the presence of 1 equiv of KBr, on the other hand, yields the first CSC-Pd(II) pincer complex [PdBr(B-κ3CSC)]NO3 (3) bearing two carbene moieties. All three complexes have been fully characterized by multinuclei NMR spectroscopies, ESI mass spectrometry and X-ray diffraction analysis. Their catalytic activities in the Mizoroki–Heck reaction have been evaluated as well.

Graphical abstract: Syntheses and catalytic activities of pseudo-pincer and CSC pincer-type Pd(II) complexes derived from benzannulated N-heterocyclic carbenes

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Article information


Submitted
20 Apr 2009
Accepted
22 Jul 2009
First published
31 Jul 2009

Dalton Trans., 2009, 7262-7268
Article type
Paper

Syntheses and catalytic activities of pseudo-pincer and CSC pincer-type Pd(II) complexes derived from benzannulated N-heterocyclic carbenes

H. V. Huynh, D. Yuan and Y. Han, Dalton Trans., 2009, 7262
DOI: 10.1039/B907887H

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