Chiral ionic liquids

US6900313B2 · kind B2 · utility

Inventors

• Peter Wasserscheid · Cologne, DE
• Wilhelm Keim · Aachen, DE
• Carsten Bolm · Aachen, DE
• Andreas Bösmann · Stegen, DE

Key dates

• Filing date: Jan 29, 2001
• Grant date: May 31, 2005
• Expiry date: Feb 20, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07B2200/07
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to chiral ionic liquids of the general formula[A]n+[Y]n−,whereby n=1 or 2, the anion [Y]n− is the anion of an organic or inorganic proton acid and the cation [A]+ an optically active organic ammonium cation with up to 50 carbon atoms, at least one chirality center and at least one functional group that can produce a coordination by forming hydrogen bridges or by providing free electron pairs. At least one chirality center is provided with a distance of up to 5 atomic bonds from the functional group. The invention also relates to a method for producing said chiral ionic liquids and to the use thereof in methods for the asymmetric synthesis, the asymmetric catalysis and for separating racemates.