This work is part of the planned thesis of G. Braun, RWTH Aachen. It was supported by the Bundesministerium für Bildung, Forschung, Technologie, und Wissenschaft, Bonn (FKZ 03 D 00007 A2), and the Funds der chemischen Industrie, Frankfurt. We thank Dr. Helmut Cölfen, Max-Planck-Institut für Kolloid- und Grenzflächenforschung/Teltow-Seehof, for the studies employing the analytical ultracentrifuge.
Enantioselective Hydrogenations on Platinum Colloids†
Article first published online: 22 DEC 2003
Copyright © 1996 by VCH Verlagsgesellschaft mbH, Germany
Angewandte Chemie International Edition in English
Volume 35, Issue 17, pages 1992–1995, September 20, 1996
How to Cite
Bönnemann, H. and Braun, G. A. (1996), Enantioselective Hydrogenations on Platinum Colloids. Angew. Chem. Int. Ed. Engl., 35: 1992–1995. doi: 10.1002/anie.199619921
- Issue published online: 22 DEC 2003
- Article first published online: 22 DEC 2003
- Manuscript Revised: 7 MAY 1996
- Manuscript Received: 8 FEB 1996
- asymmetric synthesis;
- platinum compounds
The chemical reduction of aqueous solutions of platinum salts in the presence of the alkaloid dihydrocinchonidine yields chirally coated platinum colloids. The particle sizes can be varied in a controlled fashion from 1.5 to 4 nm by changing the alkaloid concentration. These chirally coated platinum colloids function in quasi-homogenous phases as enantioselective hydrogenation catalysts for ethylpyruvate (76% ee), and no structure sensitivity was observed.