A series of Pd complexes of picoline-functionalized N-heterocyclic carbenes with different substituents were synthesized. The molecular structures of selected complexes were determined by X-ray diffraction studies, showing a pseudo-square-planar structure with a Pd center surrounded by carbene, pyridine, and two chloride ligands. The influence of the different substituents on the structure and reactivity of the complexes has been studied. The catalytic properties of the complexes were investigated in the Mizoroki–Heck reaction for cross-coupling of bromobenzene with a variety of aryl halides. Their performances varied in these reactions but showed good product regioselectivities.
一系列具有
吡啶功能化N-杂环卡宾不同取代基的
钯配合物被合成出来。通过X射线衍射研究确定了一些选定配合物的分子结构,显示出具有围绕
钯中心的卡宾、
吡啶和两个
氯化物
配体的伪平面四方结构。研究了不同取代基对配合物结构和反应性的影响。这些配合物的催化性质在Mizoroki-Heck反应中进行了研究,用于
溴苯与各种芳基卤化物的交叉偶联。它们在这些反应中的性能各异,但表现出良好的产物区域选择性。