Rs-thioctic acid with novel morphology

Details Rs-thioctic acid with novel morphology Rs-thioctic acid with novel morphology

C - Chemistry, Metallurgy

07

D

C07D 339/04 (2006.01) A61K 31/385 (2006.01)

Patent

CA 2109050

RS-thioctic acid with a novel morphology which is obtained by a recrystallization process is described. The process comprises dissolving one part thioctic acid at 10 to 60°C in 5 to 20 parts solvent or solvent mixture and then cooling the solution within 2 to 10 hours to zero to -20°C the solvent has a dielectric constant, epsilon, between 2.5 and 5.5 and is, e.g., a mixture of pentane, cyclohexane and acetic acid, ethyl, ester or ethers. The novel morphology allows the product to have favourable galenic processing properties when preparing pharmaceuticals.

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