Preparation of optically active aliphatic carboxylic acids

Details Preparation of optically active aliphatic carboxylic acids Preparation of optically active aliphatic carboxylic acids

C - Chemistry, Metallurgy

07

C

C07C 53/132 (2006.01) C07B 57/00 (2006.01) C07C 51/487 (2006.01) C07C 67/60 (2006.01)

Patent

CA 2128519

2128519 9315038 PCTABS00024 An improved process for the separation of enantiomers of a racemic mixture of certain aliphatic carboxylic acids or esters thereof is disclosed. The process involves adding a mixture of the aliphatic carboxylic acid to the material formed by: (i) forming a solution comprising said racemic mixture of a C1 to C6 linear or branched aliphatic carboxylic acid and an organic or inorganic solvent; (ii) treating said solution with a chiral organic nitrogenous base; (iii) precipitating from the reaction solution formed in step (ii) a crystalline material comprised of the less soluble diastereomeric salt. The solution is admixed with the crystalline material for a time sufficient to cause an increase in the amount of the less soluble diastereomeric salt in the crystalline material.

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