Novel benzimidazolium salts having N-benzyl or N-(4-substitutedbenzyl) groups were synthesized and their microwave-promoted catalytic activity for the Suzuki--Miyaura cross-coupling reaction were determined using in situ formed palladium(0) nanoparticles (PdNPs) from a catalytic system consisting of Pd(OAc)_2/K2CO_3 in DMF/H_2O. PdNPs were characterized by X-ray diffraction (XRD) pattern and particle size of in situ generated PdNPs from the Pd(111) plane was determined to be of diameter 19.6 nm by the Debye--Scherrer equation. Moreover, the yield of the Suzuki--Miyaura reactions with aryl iodides and aryl bromides was found to be nearly quantitative. The synthesized benzimidazole salts (1--5) were identified by ^1H and ^13}C NMR and IR spectroscopic methods, and micro analysis. The molecular structure of 5 was also determined by X-ray crystallography.
合成了具有N-苄基或N-(4-取代苄基)基团的新型
苯并咪唑盐,并测定了它们在微波促进下的铃木-宫浦交叉耦合反应的催化活性,采用了由Pd(OAc)₂/K₂CO₃在
DMF/H₂O中形成的原位产生的零价
钯纳米颗粒(PdNPs)。通过X射线衍射(XRD)图谱对PdNPs进行了表征,并通过德拜-谢雷方程确定了从Pd(111)平面生成的PdNPs的粒径为19.6 nm。此外,发现芳基
碘和芳基
溴的铃木-宫浦反应产率几乎是定量的。合成的
苯并咪唑盐(1-5)通过^1H和^13}C NMR以及红外光谱法和微量分析进行了鉴定。5的分子结构还通过X射线晶体学进行了确定。