ONO pincer palladium (II) complexes featuring furoylhydrazone ligands: Synthesis, characterization and catalytic activity towards Suzuki–Miyaura coupling reaction

• DOI: 10.1002/aoc.5116
• Publication Date: 2019-07-25T05:44:45Z
• Authors: Hengyu Qian; Shuyan Yu; Liping Song; Tongyan Zhang; Zhigang Yin; Feng Zhao; Jiale Yang; Caihong Wang
• Keywords: Coupling reaction; Hydrazone

Four new palladium pincer complexes incorporating ONO type furoylhydrazone ligands have been prepared in good yields. These were structurally characterized by elemental analysis, infrared, 1 H‐ and 13 C‐NMR spectra. X‐ray single crystal analyses of Pd1–Pd4 revealed that the metal center adopted a slightly distorted square planar geometry which hydrazone bound ion via phenolic‐O, azomethine‐N imidolate‐O atoms. Using these as catalyst, excellent yields biaryls could be obtained for coupling arylboronic acids with aryl bromides at low catalyst loading (0.01 mol%).