Calculation of the efficiency of optical resolutions on the basis of the binary phase diagram for the diastereoisomeric salts

Dávid Kozma, G. Pokol, Mária Ács

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Abstract

In resolutions based on the solubility difference between pairs of diastereoisomeric salts, the maximum efficiency (parameter S) can be calculated from a knowledge of the eutecic composition of the binary T-x diagram. We demonstrate that an approximate binary phase diagram can be determined from the DSC melting curve of a single diastereoisomeric salt mixture, namely the global 1:1 mixture of diastereoisomeric salts isolated from a resolution without separation. Data estimated with the reported method are compared to the experimental results of seven resolutions. The method has proved to be efficient for diastereoisomeric salt systems forming crystalline conglomerates. Comparison of calculated S values obtained from a single racemic substrate with different resolving agents facilitates selection of the best resolving agent in the set.

Original languageEnglish
Pages (from-to)435-439
Number of pages5
JournalJournal of the Chemical Society, Perkin Transactions 2
Issue number3
Publication statusPublished - 1992

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Phase diagrams
Salts
Melting
Solubility
Crystalline materials
Substrates
Chemical analysis

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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