Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 359, Issue 6, Pages 933-940Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.201601370
Keywords
catalytic hydrogenation; iridium oxide nanoparticles; naked nanocatalyst; nitrogen heterocycles; recyclability
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Funding
- National Natural Science Foundation of China (NSFC) [21372118]
- Fundamental Research Funds for the Central Universities [KYTZ201604]
- Foundation Research Project of Jiangsu Province (Natural Science Foundation) [BK20141359]
- Foundation of the Jiangsu Education Committee, China [14KJD150002]
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Iridium( IV) oxide nanoparticles were facilely prepared from iridium trichloride hydrate and sodium hydroxide by a ball-milling reaction at room temperature. The naked iridium nanocatalyst showed high stability and activity for the hydrogenation of a series of nitrogen heterocycles, for the first time, under a hydrogen balloon at room temperature with a selectivity of higher than 99%. Besides, an unprecedented substitution-dependent effect was discovered, where substrates with vicinal substituents on 2-, 3-, or 8-positions exhibited distinctly higher reaction rates than unsubstituted or remote substituted ones. Extraordinary recyclability was discovered in the hydrogenation of 2-methylquinoline for 30 runs without loss of activity.
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