carbene) palladium complexes has been synthesized and applied in asymmetric Suzuki cross-coupling of aryl halide and aryl boronic acid. X-ray crystallographic studies of square-planar palladium complexes of four of these bis(NHC) ligands revealed that the dihedral angle of the bridging biaryl moiety depends on its identity and lies between 79.65° and 92.69°. A linear correlation between the dihedral angle
合成了一系列新型联芳基桥联双(N-杂环卡宾)
钯配合物,并应用于芳基卤化物和芳基
硼酸的不对称Suzuki交叉偶联。对这些双 (NHC)
配体中的四个的方形平面
钯配合物的 X 射线晶体学研究表明,桥联联芳基部分的二面角取决于其特性,介于 79.65° 和 92.69° 之间。首次报道了这些 Pd 配合物中的二面角与交叉偶联对映选择性之间的线性相关性。此外,发现较大的 C卡宾-Pd-C卡宾咬合角会导致对映选择性增加,先是快速增长,然后是缓慢增长趋势。