P212121. All complexes were utilized as pre-catalysts in a comparative study to probe relevant features of the palladium active species during high temperature Suzuki–Miyaura cross-coupling catalysis. Relatively higher catalytic activities were obtained for complexes bearing the bidentate ligands that possess weaker azole donor arms. Results obtained suggest that ligand dissociation steps may be important
一系列二
氯化钯(Ⅱ)配合物(PD1 - Pd4ox)的基础上hemilabile 2-(
1H-咪唑-2-基)
吡啶和2-(
恶唑-2-基)
吡啶配体被合成和表征的衍
生物。的配位体设计为引入各种电子和结构特征和晶体结构PD1,Pd1Me,器Pd3,和Pd3Me进行了测定。PD1和Pd1Me两者结晶的单斜晶系空间群C ^ 2 / C。Pd3在单斜空间群P 2 1 / c中结晶,而Pd3Me在正交空间群P 2 1 2 1 2 1中结晶。在一项比较研究中,所有配合物均被用作前催化剂,以探索高温Suzuki-Miyaura交叉偶联催化过程中
钯活性物种的相关特征。对于带有带有较弱的唑供体臂的二齿
配体的配合物,获得了相对较高的催化活性。获得的结果表明,
配体解离步骤对于高效产生活性物质可能很重要。特别地,在所研究的系列中观察到的
配体效应表明,对于配合物而言观察到更高的催化剂效率,对于该配合物,
钯中心的
配体配位很容易转化为单齿模式。