Abstract
Cinchonidine (CD)-modified palladium catalyst gave the high product ee when a commercial wet Pd/C was used after the co-evaporation pretreatment. The improvement in the ee was attributed to removal of water from a specific Pd/C interior. The use of a water-soluble CD·HCl salt resulted in the high ee without pretreatment.
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Acknowledgments
This work was supported by Grant-in-Aid for Scientific Research on Priority Areas (No. 20037058, “Chemistry of Concerto Catalysis”) from MEXT of Japan, and by Global COE program from JSPS. The authors thank Emeritus Professor Okuyama for his helpful discussions, and N.E. CHEMCAT Co. for donating the Pd/C catalysts. The authors also thank Daicel Chemical Industry, Ltd. for operation of the Karl–Fischer titration.
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Kim, T.Y., Yokota, M., Uchida, T. et al. Conditioning of Palladium-on-carbon (Pd/C) for Uniform Cinchonidine Modification to Perform Highly Enantioselective Hydrogenation. Catal Lett 131, 279–284 (2009). https://doi.org/10.1007/s10562-009-0067-z
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DOI: https://doi.org/10.1007/s10562-009-0067-z