Novel method for preparing (-)-cibenzoline succinate

(−)-Cibenzoline.chiral acid salt of formula (IVA),

• wherein the chiral acid is selected from the group consisting of L-(+)-Tartaric acid, D-(−)-Tartaric acid, (R)-(−)-Mandelic acid, (S)-(+)-Mandelic acid, Dibenzoyl-L-tartaric acid, (+)-2,3-Dibenzoyl-D-tartaric acid, (−)-O,O′-Dibenzoyl-L-tartaric acid monohydrate, (+)-O,O-Dibenzoyl-D-tartaric acid monohydrate, (−)-O,O′-Dibenzoyl-L-tartaric acid mono(dimethylamide), Di-p-toluoyl-D-tartaric acid monohydrate, Di-p-toluoyl-L-tartaric acid monohydrate, (−)-O,O′-Di-p-toluoyl-L-tartaric acid, (+)-O,O′-Di-p-toluoyl-D-tartaric acid, (+)-O,O′-Di-p-toluoyl-D-tartaric acid, D-Glutamic acid, L-Glutamic acid, L-(−)-Malic acid, D-(+)-Malic acid, (−)-Menthyloxyacetic acid, (+)-Menthyloxyacetic acid, (R)-(+)-α-Methoxy-α-trifluoromethylphenylacetic acid, (S)-(−)-α-Methoxy-α-trifluoromethylphenylacetic acid, (R)-(−)-5-Oxo-2-tetrahydrofurancarboxylic acid, (S)-(+)-5-Oxo-2-tetrahydrofurancarboxylic acid, (R)-(+)-N-(1-Phenylethyl)phthalamic acid, (S)-(−)-N-(1-Phenylethyl)phthalamic acid, (R)-(−) Phenylpropionic acid, (S)-(+)-2-Phenylpropionic acid, L-Pyroglutamic acid, D-Pyroglutamic acid, D-(−)-Quinic acid, L-(+)-Quinic acid, L-Aspartic acid, D-Aspartic acid, (R)-1,4-Benzodioxane-2-carboxylic acid, (S)-1,4-Benzodioxane-2-carboxylic acid, N,N-Bis[(S)-(−)-1-phenylethyl]phthalamic acid, N,N-Bis[(R)-(+)-1-phenylethyl]phthalamic acid, (1S)-(+) Bromocamphor-10-sulfonic acid hydrate, (1R)-(−)-3 -Bromocamphor-10-sulfonic acid hydrate, (1S)-(−)-Camphanic acid, (1R)-(+)-Camphanic acid, (1R,3 S)-(+)-Camphoric acid, (1S,3R)-(−)-Camphoric acid, (1R)-(−)- 10-Camphorsulfonic acid, and (1 S)-(+)-10-Camphorsulfonic acid.