Piperazine- and DABCO-bridged dinuclear N-heterocyclic carbene palladium complexes: synthesis, structure and application to Hiyama coupling reaction

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• 作者：Haozhen Wang and Jin Yang
• 刊名：Applied Organometallic Chemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：31
• 期：1
• 全文大小：673K
• ISSN：1099-0739

文摘

Four dinuclear N-heterocyclic carbene (NHC) palladium complexes were prepared by reaction of imidazolinium salts, PdCl₂ and bridging ligands (piperazine and DABCO) in one pot or by direct cleavage of the chloro-bridged dimeric compounds [Pd(μ-Cl)(Cl)(NHC)]₂ with bridging ligands. All of the complexes were fully characterized using ¹H NMR, ¹³C NMR, high-resolution mass and infrared spectroscopies, elemental analysis and single-crystal X-ray diffraction. The catalytic activities of the obtained palladium catalysts towards Hiyama coupling of aryl chlorides with phenyltrimethoxysilane were investigated and the results showed that the dinuclear palladium complexes were considerably active for the coupling reaction. Copyright