Room-temperature activation of aryl chlorides in Suzuki–Miyaura coupling using a [Pd(μ-Cl)Cl(NHC)]2 complex (NHC = N-heterocyclic carbene)
作者:Olivier Diebolt、Pierre Braunstein、Steven P. Nolan、Catherine S. J. Cazin
DOI:10.1039/b804695f
日期:——
A straightforwardly synthesised complex, [Pd(μ-Cl)Cl(NHC)]2 (NHC = bis(2,6-diisopropylphenyl)imidazol-2-ylidene, IPr), has been employed to mediate SuzukiâMiyaura reactions involving aryl chlorides at very low catalyst loadings and at room temperature.
of this issue is the group of Dominique Matt at the University of Strasbourg. The cover image shows a palladium complex stabilized by an N-heterocyclic carbene bearing two non-rotating alkylfluorenyl substituents. The NHC ligand functions like a clamp to permanently protect two trans-located coordination sites.
1,3-Phenylene-bis-(1<i>H</i>)-tetrazole Pincer Ligand for Palladium-Catalyzed Suzuki Cross-Coupling Reactions of Arylhalides with Arylboronic Acids
作者:Chang Ho Oh、Arun Kumar Gupta、Chul Yun Rim
DOI:10.1055/s-2004-831303
日期:——
1,3-Phenylene-bis-(1H)-tetrazole pincer ligand was synthesized by the reaction of 1, 3-phenylenediamine, sodium azide and triethyl orthoformate in acetic acid and successfully used in Suzuki cross coupling reactions of aryl halides with aryl boronic acids.
Formation of Homoleptic Tetracarbene versus
<i>cis</i>
‐Chelating Dicarbene Complexes of Nickel(II) and Applications in Kumada–Corriu Couplings
作者:Han Vinh Huynh、Ramasamy Jothibasu
DOI:10.1002/ejic.200801149
日期:2009.5
The formation of mono- versus bis(chelate) NiII complexes bearing N-heterocyclic dicarbene ligands can be controlled by the flexibility of the ligand bridge. A short methylene spacer exclusively gives rise to a dicationic bis(chelate) complex [Ni(MeCCmeth)2]Br2 (1), whereas a more flexible propylene spacer affords a neutral monochelate complex [NiBr2(MeCCprop)] (2). Complex 2 was found to autoionize
Synthesis of Biaryls via Decarboxylative Pd-Catalyzed Cross-Coupling Reaction
作者:Jean-Michel Becht、Cédric Catala、Claude Le Drian、Alain Wagner
DOI:10.1021/ol070495y
日期:2007.4.1
and efficient route to biaryls via Pd-catalyzed decarboxylative cross-couplings of arene carboxylic acids and aryl iodides is reported. The PdCl2/AsPh3 catalytic system in the presence of Ag2CO3 in DMSO was found to be particularly efficient to perform this transformation. This reaction can be extended to the synthesis of various biaryls, including sterically hindered biaryls, with yields ranging from