Investigation on the Coordination Mode of IL-Supported Diols Used as Phosphine-Free Ligands for Palladium Catalyzed Heck Reaction |
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| Authors: | Yueqin Cai Gonghua Song Xiao Chen |
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| Institution: | [1]School of Chemistry and Molecular Engineering, East China University of Science and Technology Shanghai 200237, China [2]Shanghai Key Laboratory of Chemical Biology, Institute of Pesticides ＆ Pharmaceuticals, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | The coordination mode of IL‐supported diols used as phosphine‐free ligands for palladium catalyzed Heck reaction has been investigated by tuning their compositions. The difference in coordination of these IL‐supported diols with metal Pd in Heck reaction was related to the changes of the cation rings, leading to the different activities of Pd catalyst in the reaction. The experimental results indicated that the activities of Pd catalyst were affected mainly by π‐electron density of the cation rings. Compared to pyridinium and piperidinium cations, imidazolium cations showed the best coordination to metal Pd. In the meantime, C‐2 hydrogen and the length of alkyl side chains had impacts on the coordination as well. |
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| Keywords: | homogeneous catalysis acylation Heck reaction phosphine-free ligands |
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