Crystalline Hybrid Solid Materials of Palladium and Decamethylcucurbit[5]uril as Recoverable Precatalysts for Heck Cross‐Coupling Reactions |
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Authors: | Dr. Hongfang Li Dr. Jian Lü Dr. Jingxiang Lin Dr. Yuanbiao Huang Dr. Minna Cao Prof. Rong Cao |
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Affiliation: | 1. State Key Laboratory of Structural Chemistry, Institution Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou 350002 (P.R. China), Fax: (+86)?591‐8379‐6710;2. School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD (UK) |
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Abstract: | A series of M? Pd? Me10CB[5] (M=Li, Na, K, Rb, and Cs; Me10CB[5]=decamethylcucurbit[5]uril) hybrid solid materials have been successfully synthesized for the first time through a simple diffusion method. These as‐prepared hybrid solids have been applied as phosphine‐free precatalysts for Heck cross‐coupling reactions with excellent catalytic performance and good recyclability. In the processes of the catalytic reactions, the activated PdII species were released from the crystalline hybrid precatalysts and transformed into catalytically active Pd nanoparticles, which have been demonstrated as key to carry on the catalytic reactions for the recoverable precatalysts M? Pd? Me10CB[5] (M=K, Rb, and Cs). It has also been rationalized that the introduction of different alkali metals afforded crystalline hybrid precatalysts with different crystal structures, which are responsible for their diversified stability and reusability presented in Heck reactions. |
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Keywords: | cross‐coupling cucurbiturils Heck reaction nanoparticles palladium |
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