Carbon-encapsulated Ni and Cu nanoparticles with a core/shell structure were synthesized by levitational gas condensation (LGC). Methane (CH4) gas was used to coat the surface of the Ni and Cu nanoparticles. The Ni particles had a core diameter of 10 nm, and were covered by 2–3 nm thin carbon layers. In the case of Cu, the particles had a core diameter of 30 nm, and multi-shells with a thickness of 2–3 nm. Biginelli reaction in the presence of l-proline and Ni encapsulated nanoparticles was carried out to change the ratio between stereoisomers in favor of the S-enantiomer for 3,4–dihydropyrimidine (DHPM) with an excess of about 18%.
Carbon-encapsulated metal nanoparticles Biginelli reaction 3,4–dihydropyrimidine (DHPM) Chiral
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This research was supported by a grant from “New technology development for synthesis of green nanopowder” by Ministry of Knowledge Economy, Republic of Korea.
R.S. Ruoff, D.C. Lorents, B. Chan, R. Malhotra, S. Subramoneg, Science 259(5093), 346–348 (1993)CrossRefGoogle Scholar