Polyhedral Cu2O to Cu pseudomorphic conversion for stereoselective alkyne semihydrogenation

Sourav Rej, Mahesh Madasu, Chih Shan Tan, Chi Fu Hsia, Michael H. Huang*

*Corresponding author for this work

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)

摘要

Cu2O cubes, octahedra, and rhombic dodecahedra can be pseudomorphically converted into Cu crystals of corresponding shapes through reduction by ammonia borane in ethanol at 50 °C or below within 3 min, demonstrating the feasibility of making challenging polyhedral metal particles from metal oxide crystals. Hydrogen gas is also produced from ammonia borane in the process. The obtained Cu crystals have a slightly nanoporous interior. Addition of diphenylacetylene in the formation of Cu rhombic dodecahedra leads to complete stereoselective production of sterically hindered (Z)-stilbene. Semihydrogenation of other alkynes also gives pure (Z)-alkenes. Cu cubes and octahedra also showed considerable (Z)-stilbene selectivity along with minor formation of (E)-stilbene and bibenzyl as compared to CuCl2 and commercial Cu2O particles. Mechanistic studies reveal that the low binding affinity of alkenes on the rhombic dodecahedra surfaces leads to high product selectivity. These Cu crystals act as a green and low-cost catalyst for the synthesis of high-purity (Z)-alkenes.

原文English
頁(從 - 到)2517-2524
頁數8
期刊Chemical Science
9
發行號9
DOIs
出版狀態Published - 7 三月 2018

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