Abstract
The relationship of racemic structure to resolution by preferential crystallization was discussed on the ternary phase diagrams of systems containing optical isomers and a solvent. From these discussions, it was concluded that the resolution by this method is applicable only to racemic mixtures, and that racemic compounds and also racemic solid solutions can not be resolved. In addition, we reexamined the resolution of 3, 3-diethyl-5-methyl-2, 4-dioxopiperidine reported to be resolved by this method in spite of the formation of a racemic solid solution, and found it impossible to resolve this compound by preferential crystallization.
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