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Li H, Gao Y, Wu Y, Liu C, Cheng C, Chen F, Shi Y, Zhang B. σ-Alkynyl Adsorption Enables Electrocatalytic Semihydrogenation of Terminal Alkynes with Easy-Reducible/Passivated Groups over Amorphous PdS x Nanocapsules. J Am Chem Soc 2022; 144:19456-19465. [PMID: 36197038 DOI: 10.1021/jacs.2c07742] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Highly chemo- and regioselective semihydrogenation of alkynes is significant and challenging for the synthesis of functionalized alkenes. Here, a sequential self-template method is used to synthesize amorphous palladium sulfide nanocapsules (PdSx ANCs), which enables electrocatalytic semihydrogenation of terminal alkynes in H2O with excellent tolerance to easily reducible groups (e.g., C-I/Br/Cl, C═O) and the metal center deactivating skeletons (e.g., quinolyl, carboxyl, and nitrile). Mechanistic studies demonstrate that specific σ-alkynyl adsorption via terminal carbon and negligible alkene adsorption on isolated Pd2+ sites ensure successful synthesis of various alkenes with outstanding time-irrelevant selectivity in a wide potential range. The key hydrogen and carbon radical intermediates are validated by electron paramagnetic resonance and high-resolution mass spectrometry. Gram-scale synthesis of 4-bromostyrene and expedient preparation of deuterated alkene precursors and drugs with D2O show promising applications. Impressively, PdSx ANCs can be applied to the prevailing thermocatalytic semihydrogenation of functionalized alkyne using H2.
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Affiliation(s)
- Huizhi Li
- Department of Chemistry, Institute of Molecular Plus, School of Science, Tianjin University, Tianjin 300072, China
| | - Ying Gao
- Department of Chemistry, Institute of Molecular Plus, School of Science, Tianjin University, Tianjin 300072, China
| | - Yongmeng Wu
- Department of Chemistry, Institute of Molecular Plus, School of Science, Tianjin University, Tianjin 300072, China
| | - Cuibo Liu
- Department of Chemistry, Institute of Molecular Plus, School of Science, Tianjin University, Tianjin 300072, China.,Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
| | - Chuanqi Cheng
- Institute of New Energy Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Fanpeng Chen
- Department of Chemistry, Institute of Molecular Plus, School of Science, Tianjin University, Tianjin 300072, China
| | - Yanmei Shi
- Department of Chemistry, Institute of Molecular Plus, School of Science, Tianjin University, Tianjin 300072, China
| | - Bin Zhang
- Department of Chemistry, Institute of Molecular Plus, School of Science, Tianjin University, Tianjin 300072, China.,Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
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