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Synthesis, crystal structures, and catalytic activities of palladium imidazole complexes formed by 2-hydroxyethyl group cleavage

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Abstract

N-4,6-dimethyl-2-pyrimidinylimidazole 1 and its hydroxyethyl derivative 1-(2-hydroxyethyl)-3-(4,6-dimethyl-2-pyrimidinyl)imidazolium chloride 2 have been synthesized and characterized. The attempted synthesis of bis(N-heterocyclic carbene)palladium complexes via the direct reaction of 2 with Pd(OAc)2 results in the unexpected formation of a bis(N-arylimidazole) palladium complex 3. Additionally, the analogous bis(N-methylimidazole) palladium complex 4 has also been synthesized by the above method. Compounds 14 were characterized by elemental analysis, IR, and 1H NMR. Additionally, their crystal structures have been determined by X-ray diffraction. Complexes 3 and 4 were found to be efficient catalysts for the Suzuki reaction.

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Acknowledgments

We are grateful to the National Natural Science Foundation of China (No. 20902043) and the Natural Science Foundation of Henan Province and Henan Education Department, China (Nos. 102300410220 and 2009B150019) for financial support of this work.

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Correspondence to Chen Xu.

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Xu, C., Li, Z., Duan, LM. et al. Synthesis, crystal structures, and catalytic activities of palladium imidazole complexes formed by 2-hydroxyethyl group cleavage. Transition Met Chem 37, 373–378 (2012). https://doi.org/10.1007/s11243-012-9598-z

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  • DOI: https://doi.org/10.1007/s11243-012-9598-z

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