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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.

Polyhedral Cu2O to Cu pseudomorphic conversion for stereoselective alkyne semihydrogenation

Polyhedral Cu₂O to Cu pseudomorphic conversion for stereoselective alkyne semihydrogenation