[IL]2[PdCl4] complexes (IL=imidazolium cation) as efficient catalysts for Suzuki–Miyaura cross-coupling of aryl bromides and aryl chlorides
作者:E. Silarska、A.M. Trzeciak、J. Pernak、A. Skrzypczak
DOI:10.1016/j.apcata.2013.06.046
日期:2013.9
were also obtained in the Suzuki–Miyaura reaction of different aryl bromides and chlorides. For example, the conversion of 2-chlorotoluene was 71% at 70 °C. During the catalytic reaction, the formation of Pd(0) nanoparticles was evidenced by TEM. Mechanistic studies, including Hg(0) tests, showed that Pd(0) nanoparticles acted as a source of catalytically active soluble palladium species.
发现[IL] 2 [PdCl 4 ]类型的钯配合物(IL =咪唑阳离子)是2-溴甲苯与苯基硼酸在2-丙醇或2-丙醇/中进行的Suzuki-Miyaura反应的非常活泼的催化剂。使用常规加热或微波作为加热源在40°C的水中加热。在2-丙醇中,[dmiop] 2 [PdCl 4 ]和[dmdim] [PdCl 4 ]的收率最高(89%和85%)(dmiop = 1,2-二甲基-3-丙氧基甲基咪唑鎓阳离子,dmdim = 3,3′-[1,7-(2,6-二氧杂庚烷)]双(1,2-二甲基咪唑鎓)阳离子,其含有在C2碳上被甲基取代的阳离子。在水的存在下,所有[IL] 2 [PdCl 4]复合物产生约。90%的2-甲基联苯 在不同的芳基溴化物和氯化物的Suzuki-Miyaura反应中也获得了很好的结果。例如,在70℃下2-氯甲苯的转化率为71%。在催化反应过程中,TEM证实了Pd(0)纳米颗粒的形成。