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Polyhedral Cu2O to Cu pseudomorphic conversion for stereoselective alkyne semihydrogenationElectronic supplementary information (ESI) available. See DOI: 10.1039/c7sc05232d
Cu 2 O 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...
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| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | Cu
2
O 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 CuCl
2
and commercial Cu
2
O 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.
Cu
2
O nanocrystals can be pseudomorphically converted into Cu crystals through ammonia borane reduction, releasing hydrogen for stereoselective semihydrogenation of diphenylacetylene. |
|---|---|
| ISSN: | 2041-6520 2041-6539 |
| DOI: | 10.1039/c7sc05232d |