Synthesis and catalytic activity of chiral dicarbene dipalladium complexes incorporating the S-binaphthol unit

Article abstract of DOI:10.3184/174751918X15168768395864

A series of chiral di-N-heterocyclic carbene (NHC) dipalladium complexes, [{PdPyCl₂}₂(di-NHC)], in which di-NHC represents a diimidazolylidene, featuring an (S)-3,3'-dimethyl-2,2'-dimethoxy-1,1'-binaphthalene spacer between the carbene units, have been prepared. The influence of ligand size on the catalytic activity of these complexes in the Suzuki reaction of phenylboronic acid with p-bromotoluene has been investigated. The most sterically hindered complex, bearing the di-isopropylphenyl group, showed the greatest catalytic activity, and it is active for various aryl halides with different electronic and steric properties.