Process for improving enantiomeric purity of aldehydes

Details Process for improving enantiomeric purity of aldehydes Process for improving enantiomeric purity of aldehydes

C - Chemistry, Metallurgy

07

C

C07C 47/20 (2006.01) C07C 45/50 (2006.01) C07C 45/67 (2006.01) C07C 45/72 (2006.01) C07C 45/78 (2006.01) C07C 45/81 (2006.01) C07C 49/86 (2006.01) C07C 51/487 (2006.01) C07D 209/46 (2006.01) C07D 333/22 (2006.01) C07D 487/04 (2006.01)

Patent

CA 2193959

This invention relates to a process for producing an optically active aldehyde (first aldehyde) containing a reduced amount of the corresponding enantiomeric aldehyde (second aldehyde) which process comprises: (1) providing an initial solution containing a non-eutectic mixture of the first aldehyde and the second aldehyde, which mixture has a composition in the compositional region where only the first aldehyde crystallizes when its solubility limit in the solution is exceeded, and (2) maintaining the solution at a temperature above the eutectic temperature of the mixture and under conditions such that the solubility limit of the first aldehyde is exceeded so as to form a crystalline first aldehyde containing relatively less of the second aldehyde than was present in the initial solution.

Cette invention se rapporte à un procédé pour produire un aldéhyde optiquement actif (premier aldéhyde) contenant une quantité réduite de l'aldéhyde énantiomère correspondant (second aldéhyde). Ce procédé consiste: (1) à fournir une solution initiale contenant un mélange non eutectique du premier aldéhyde et du second aldéhyde, ce mélange ayant une composition dans la région compositionnelle telle que seul le premier aldéhyde se cristallise lorsque sa limite de solubilité dans la solution est dépassée; et (2) à maintenir cette solution à une température supérieure à la température eutectique du mélange et dans des conditions telles que la limite de solubilité du premier aldéhyde est dépassée, afin de former un premier aldéhyde cristallin contenant une quantité du second aldéhyde relativement plus petite que celle qui était présente dans la solution initiale.

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