Method for the racemisation of enantiomers of .alpha.-lipoic...

Details Method for the racemisation of enantiomers of .alpha.-lipoic... Method for the racemisation of enantiomers of .alpha.-lipoic...

C - Chemistry, Metallurgy

07

D

C07D 339/04 (2006.01)

Patent

CA 2154910

Method for the racemisation of pure optical isomers of .alpha.- lipoic acid or mixtures of pure optical isomers of .alpha.-lipoic acid, wherein one of the optical isomers is present in excess. The .alpha.-lipoic acid is racemised in solid form, in suspension, or in a mixture of inert organic solvents with or without addition of water at temperatures of between 110°C and 200 °C at pressures of from normal pressure up to 50 bar for 10 to 48 hours. The yields are approximately 70% with a racemised proportion of an enantioner of up to 49%.

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