Abstract
A series of 13 new PEPPSI-type complexes with small NHC ligands and differently substituted imidazoles were prepared using as substrates [Pd(μ-X)X(bmim-y)]2 dimer or imidazole complexes PdCl2(imidazole)2. Improvement of the synthetic method allowed simplification of the purification step. The obtained complexes efficiently catalyzed the Suzuki-Miyaura cross-coupling of substituted bromobenzenes and arylboronic acids in water and in iPrOH/water mixture. The observed catalytic activity was significantly better than that of Pd(OAc)2 and similar to that of Pd(IPr)Cl2(3-Cl-py) in the same conditions. TEM analysis of the post-reaction mixture evidenced formation of Pd NPs of diameter ca. 3 nm, participating in the catalytic process.
Published Version
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