Synthesis of novel benzimidazole salts and microwave-assisted catalytic activity of in situ generated Pd nanoparticles from a catalyst system consisting of benzimidazol salt, Pd(OAc) 2 , and base in a Suzuki-Miyaura reaction

Authors : Ülkü YILMAZ, Hasan KÜÇÜKBAY, Sevim TÜRKTEKİN ÇELİKESİR

Pages : 721-733

Doi:10.3906/kim-1207-18

View : 18 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Novel benzimidazolium salts having N-benzyl or N-insert ignore into journalissuearticles values(4-substitutedbenzyl); groups were synthesized and their microwave-promoted catalytic activity for the Suzuki--Miyaura cross-coupling reaction were determined using in situ formed palladiuminsert ignore into journalissuearticles values(0); nanoparticles insert ignore into journalissuearticles values(PdNPs); from a catalytic system consisting of Pdinsert ignore into journalissuearticles values(OAc);2/K2CO3 in DMF/H2O. PdNPs were characterized by X-ray diffraction insert ignore into journalissuearticles values(XRD); pattern and particle size of in situ generated PdNPs from the Pdinsert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(1--5); were identified by 1H and 13C NMR and IR spectroscopic methods, and micro analysis. The molecular structure of 5 was also determined by X-ray crystallography.
Keywords : Benzimidazole salt, N heterocyclic carbenes, palladium nanoparticles, cross coupling reaction, Suzuki Miyaura coupling, microwave