Enantioselective Hydrogenations on Platinum Colloids

Enantioselective Hydrogenations on Platinum Colloids

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...

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Veröffentlicht in:Angewandte Chemie International Edition 1996-09, Vol.35 (17), p.1992-1995
Hauptverfasser: Bönnemann, Helmut, Braun, Gerhard A.
Format: Artikel
Sprache:eng
Schlagworte:
asymmetric synthesis
catalysis
hydrogenation
platinum compounds
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Zusammenfassung: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.
ISSN:0570-0833
1521-3773
DOI:10.1002/anie.199619921