A Pd
<sup>II</sup>
Complex Bearing a Benzimidazole‐Derived Ligand with Potentially “Mesoionic and Remote” Character and Its Catalytic Activity
作者:Han Vinh Huynh、Hong Lee Ong、Jan C. Bernhammer、Gilles Frison
DOI:10.1002/ejic.201300334
日期:2013.9.3
affords the complex trans-[PdBr(bimy)(PPh3)2]BF4 (4), which is the first complex of an unprecedented benzimidazole-derived ligand (bimy) with a potentially "mesoionic and remote" character. DFT calculations revealed that the bimy ligand bridges the gap between the mesoionic pyrazolin-4-ylidene and the anionic phenyl ligand. A preliminary catalytic study revealed the promising activity of 4 in the Sonogashira
A series of new Au(I) hetero-bis-NHC complexes [Au(Pr-i(2)-bimy)(NHC)]X (X = BF4, PF6, 2-6) and the hetero-tetrakis-NHC complex [Au-2(Pr-i(2)-bimy)(2)(mu-ditz)](BF4)(2) (7) have been synthesized using the Au(I) acetato complex [Au(O2CCH3)(Pr-i(2)-bimy)] (C) as a basic metal precursor (Pr-i(2)-bimy = 1,3-diisopropylbenzimidazolin-2-ylidene, ditz = 1,2,4-triazolidine-3,5-diylidene). The Au(III) hetero-bis-NHC complex trans-[AuCl2(Pr-i(2)-bimy)(Bn-2-bimy)]BF4 (12; Bn-2-bimy = 1,3-dibenzylbenzimidazolin-2-ylidene) and the hetero-tetrakis-NHC complex all-trans-[Au2Cl4(Pr-i(2)-bimy)(2)(mu-ditz)](BF4)(2) (13) were obtained by oxidation of their corresponding Au(I) hetero-NHC precursors. For all Au(I) hetero-NHC complexes, the C-13 carbene signals of the constant Pr-i(2)-bimy ligand are found to be highly correlated with those in Pd(II) analogues of the type trans-[PdBr2(Pr-i(2)-bimy)(NHC)], which could be applied to detect the sigma-donating ability of the trans standing NHC. In addition, an interesting ligand redistribution process was observed for some of the Au(I) hetero-bis-NHC Complexes.
Synthesis, structural characterization and properties of new N-heterocyclic carbene Ag(I) complexes
作者:Ravada Kishore、Samar K. Das
DOI:10.1016/j.molstruc.2013.08.051
日期:2013.12
The syntheses and properties of new N-heterocyclic carbene complexes [1-(2,3,5,6-tetra methyl benzyl)-3-benzylbimy}AgCl] (2a), 11-(benzyl)-3-benzylbimy}(2)Ag][BF4] (2b), [1-(benzyl)-3-butylbimy}AgBr](2) (2c), [1-(benzyl)-3-(4-nitro-benzyl)bimy}AgBr] (2d), [1-(benzyl)-3-(4-bromo-benzyl)bimy)AgBr] (2e), [1-(benzyl)-3-(4-nitro-benzyl)bimy}(2)Ag][BF4] (2f), [1-(benzyl)-3-(4-bromo-benzyl)bimy](2)Ag][BF4] (2g) (bimy = benzimidazol-2-ylidene), and [1-(10-bromo-9-anthracenylmethyl)-3-butylimy)AgBr] (2h) (imy = imidazol-2-ylidene) have been described. Compounds 2a-2h have been characterized by H-1 NMR-, UV-vis- LC/MS-spectral studies and elemental analysis. Compounds 2a-2c and 2h are unambiguously characterized by single crystal X-ray crystallography. Compound 2h shows solution emission at room temperature. (C) 2013 Elsevier B.V. All rights reserved.