Abstract
The pincer ligands 2,6-bis(n-butylimidazoliummethyl)pyridine dihalide (halide = Cl (3a), Br (3b) are easily obtained by the reaction of n-butylimidazole with 2,6-bis(chloromethyl)pyridine and 2,6-bis(bromomethyl)pyridine in a 2:1 molar ratio, respectively. Ligand 3a readily reacts with Ag2O in CH2Cl2 to yield the bis(silver carbene) complex [2,6-bis(n-butylcarbenemethyl)pyridine][AgCl]2 (4) in 70% yield. The reaction of 4 with (PhCn)2PDCl2 in CH2Cl2 yields the palladium carbene complex Pd[2,6-bis(N-n-butylcarbenemethyl)pyridine]Cl2 (5). The reaction of equimolar amounts of 4 and [Rh(COD)Cl]2 (COD = cyclooctadiene) in CH2Cl2 gave the dirhodium(I) complex [2,6-bis(N-n-butylcarbenemethyl)pyridine][Rh(COD)Cl]2 (6). All compounds were characterized by 1H and 13C NMR spectroscopy. The solid-state structures of 4 and 6 were determined by X-ray crystallography.
Published Version
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