Stereoselective Hydrogenation of Dibenzo-18-crown-6 Catalyzed by Carbon Nanotube-Supported Rhodium Nanoparticles.
- Resource Type
- Article
- Authors
- Liu, Hsin-Wang; Pan, Horng-Bin; Tian, Guo-Xin; Chen, Hsing-Jung; Chiu, Kong-Hwa; Jen, Jen-Fon; Lo, Jiun-Guang; Wai, ChienM.
- Source
- Synthetic Communications. 2011, Vol. 41 Issue 17, p2624-2630. 7p.
- Subject
- *HYDROGENATION
*RHODIUM catalysts
*CARBON nanotubes
*NANOPARTICLES
*ACTIVATION (Chemistry)
*SONOCHEMISTRY
- Language
- ISSN
- 0039-7911
[image omitted] Multiwalled carbon nanotube-supported Rh nanoparticles prepared by a simple sonochemical method are highly active for catalytic hydrogenation of dibenzo-18-crown-6 to dicyclohexyl-18-crown-6. The catalytic hydrogenation reaction shows a selectivity favoring the cis-syn-cis isomer over cis-anti-cis isomer of the product by a factor of ≥6. Conventional Rh catalysts supported by activated wood carbon, SiO2, or Al2O3 can only convert dibenzo-18-crown-6 to dicyclohexyl-18-crown-6 with an cis-syn-cis/cis-anti-cis ratio of <1.7. The Rh nanoparticle catalyst can be reused at least six times without losing its catalytic activity. [ABSTRACT FROM AUTHOR]