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Preparation and characterization of new micelle-forming cholesterol amphiphiles |
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| Authors: | D Meissner I Grassert G Oehme G Holzhüter V Vill |
| Institution: | Institut für Organische Katalyseforschung an der Universit?t Rostock e.V. Buchbinderstrasse 5-6 D-18055 Rostock, Germany e-mail: guenther.oehme@ifok.uni-rostock.de Tel.: +49-381-4669330 Fax: +49-381-4669324, DE Universit?t Rostock, Fachbereich Physik AG Materialwissenschaft feindisperse Systeme und dünne Schichten Universit?tsplatz 3 D-18051 Rostock, Germany, DE Universit?t Hamburg Institut für Organische Chemie Martin-Luther-King-Platz 6 D-20146 Hamburg, Germany, DE |
| Abstract: | New sulfated and sulfonated cholesterol amphiphiles were synthesized and characterized by dynamic light scattering and electron microscopy. The surfactants form micelles with diameters up to 30 nm. Their critical micelle concentration values were determined by conductometry and photometric measurements. Use of the new amphiphiles enables the transfer of an asymmetric hydrogenation reaction into aqueous solution by keeping the activity and increasing the enantioselectivity. Interesting liquid-crystalline behaviour was observed. Received: 7 July 1999 /Accepted in revised form: 5 November 1999 |
| Keywords: | Cholesterol amphiphile Chiral surfactant Micelles Liquid crystalline |
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