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Palladium(II) complexes of coumarin substituted 1,2,4–triazol–5–ylidenes for catalytic C–C cross–coupling and C–H activation reactions
Journal of Organometallic Chemistry ( IF 2.3 ) Pub Date : 2020-09-20 , DOI: 10.1016/j.jorganchem.2020.121540
Achar Gautam , C.R. Shahini , A. Patil Siddappa , Małecki Jan Grzegorz , B. Hemavathi , T.N. Ahipa , Budagumpi Srinivasa

Two series of palladium complexes of the type [PdBr2(NHC)2] (4–6) and [PdBr2(NHC)Py] (7–9) bearing coumarin substituted triazole–based NHC ligands have been reported. Complexes have been prepared by in situ deprotonation of 1,2,4-triazolium salts with palladium acetate in DMSO/pyridine, and characterized by spectral and analytical techniques. The complexes displayed a distorted square–planar coordination geometry around the palladium atom, which is evidenced by the single crystal X–ray diffraction analysis of 4–6 and 9. Both the series of complexes have been evaluated for their efficacies in C–C bond formation reactions of various aryl bromides with phenylboronic acid, and C–H activation reactions of thiophene substituted cyanopyridine derivative. Complexes 7–9 outperformed the bis–NHC coordinated derivatives, 4–6, in both the type of catalytic reactions, which is attributed to the presence of a labile pyridine ligand.



中文翻译:

香豆素的钯(II)配合物取代1,2,4-三唑-5-亚烷基催化CC交叉偶联和CH活化反应

已经报道了带有香豆素取代的三唑基NHC配体的[PdBr 2(NHC)2 ](4-6)和[PdBr 2(NHC)Py](7-9)类型的两个钯配合物。已经通过DMSO /吡啶中用乙酸钯对1,2,4-三唑鎓盐进行原位去质子化反应制备了配合物,并通过光谱和分析技术对其进行了表征。配合物在钯原子周围显示出扭曲的方平面配位几何结构,这由4-69的单晶X射线衍射分析所证明。。评估了这两个系列的配合物在各种芳基溴化物与苯基硼酸的C–C键形成反应以及噻吩取代的氰基吡啶衍生物的C–H活化反应中的功效。在这两种催化反应中,由于存在不稳定的吡啶配​​体,配合物7-9的性能优于bis-NHC配位衍生物4-6

更新日期:2020-09-20
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