Mixtures of d- and l-carvone - IV. Transformation from a solid Solution toa racemic compound

Undercooled mixtures of d- and l-carvone, when heated in a calorimeter, cry stallize into solid solutions. Adiabatic measurements revealed that the equ imolar mixture is able to recrystallize from a solid solution to a more sta ble crystalline form. In this study, an adiabatic calorimeter has been used to obtain the solid-liquid phase diagram of recrystallized (stable) mixtur es of d- and l-carvone. During recrystallization, the system forms a racemi c compound. In addition, evidence has been found for the formation of anoma lous racemates in the ratios of 1:4 and 4:1. (C) 1999 Elsevier Science B.V. All rights reserved.