Remote Substitution on <i>N</i>-Heterocyclic Carbenes Heightens the Catalytic Reactivity of Their Palladium Complexes
作者:Benjamin R. Dible、Ryan E. Cowley、Patrick L. Holland
DOI:10.1021/om200349y
日期:2011.10.10
position of the arylrings. π-Cinnamylpalladium chloride complexes with these ligands are precatalysts for Suzuki–Miyaura coupling. Large triarylmethyl substituents at the 4′ position of the NHC give significantly greater catalyst activity. Although the %Vbur parameter has been proposed as a general measure of the size of bulky ligands, the sterically induced enhancement of the catalytic rate does not correlate