Abstract
Abstract The Gibbs energy of formation of racemate, binary melting point diagram, and ternary solubility diagram indicated that dicyclohexylammonium salt of N-formyl-Dl-tyrosine (Dl-DCH salt) forms a racemic compound at melting point, but is a conglomerate at room temperature. The optical resolution of the Dl-DCH salt was successfully performed by preferential crystallization. A successive preferential crystallization in methanol at 10 °C followed by purification gave d- and l-tyrosines with 100% optical purity.
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