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Influence of amphiphile concentration on the enantioselectivity in the rhodium-catalyzed reduction of unsaturated substrates in water

✍ Scribed by Fabien Robert; Günther Oehme; Ingrid Grassert; Denis Sinou

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
149 KB
Volume
156
Category
Article
ISSN
1381-1169

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✦ Synopsis

The enantioselectivity of the asymmetric hydrogenation of some unsaturated amino acid precursors with Rh COD 1 BF 4 w Ž .Ž .x and Rh COD 2 ClO as catalyst is influenced by the presence of amphiphiles. Performing the reduction in water, both the 4 activity and the enantioselectivity are enhanced significantly in the presence of surfactants. The determination of the CMC of some surfactants, as well as the reduction in mixtures of waterrmethanol in the presence of amphiphiles, give some evidence for the importance of micelles formation in these enhancements.

📜 SIMILAR VOLUMES

The reduction of oxygen on rhodium and n
The reduction of oxygen on rhodium and nickel in concentrated potassium hydroxide
✍ W.M. Vogel 📂 Article 📅 1968 🏛 Elsevier Science 🌐 English ⚖ 412 KB

The cathodic reduction of oxygen in concentrated potassium hydroxide (15 wt-% H,O) at 225°C is greatly at%cted by the presence of dissolved nickel. This effect shows up both in concentration and activation polarizations. These observations, together with indication8 for the presence of nickel redox