Abstract
A variety of chiral and achiral imidazolium salts is synthesized. Methylene-, ethylene-, propylene- and pyridinyl-bridged bis(imidazolium) halides are used to generate the respective free chelating carbenes. The synthesis of palladium complexes of general formula [cis -CH2 {NC(H)=C(H)N(R)C}2 PdX2 ] with these chelating N-heterocyclic carbene ligands is reported. Structural proofs of complexes 28 and 46 are represented by X-ray diffraction studies. Catalytic applications in the Mizoroki-Heck reaction are presented.
Key words
catalysis - chelating ligands - chiral ligands - free carbenes - Mizoroki-Heck reaction - imidazolium salts - palladium
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