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Pillar[5]arene-based N-heterocyclic carbene ligand for Pd-catalysed Suzuki reaction

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Abstract

A pillar[5]arene-based N-heterocyclic carbene ligand was prepared by reaction of bromoethoxy pillar[5]arene with excess 1-methylimidazole at 130 °C in the absence of solvent and used as a catalyst for the Suzuki coupling reaction. Excellent yields were obtained when the Suzuki reactions were carried out under ambient atmosphere in ethanol, employing 0.2 mol% ligand, 1 mol% PdCl2(CH3CN)2 and 1.5 mmol of K2CO3. The novel pillar[5]arene-based imidazolium salt is a promising material for the construction of highly active supramolecular catalytic systems.

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Acknowledgements

We are grateful for the support provided by the Research Fund for the Shanxi Natural Science Foundation of China for the Project (No. 2011011006-4).

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Correspondence to Jun-Wen Wang.

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Xiao, XD., Liu, JQ., Bai, YL. et al. Pillar[5]arene-based N-heterocyclic carbene ligand for Pd-catalysed Suzuki reaction. J Incl Phenom Macrocycl Chem 87, 29–36 (2017). https://doi.org/10.1007/s10847-016-0673-5

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  • DOI: https://doi.org/10.1007/s10847-016-0673-5

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