Abstract

A solvent-assisted solid-to-solid polymorphic transition, which was assumed to be one of the key processes for the occurrence of preferential enrichment (PE), has been proven to occur by means of temperature-controlled video-microscopy (TCVM) and time-resolved in situ X-ray powder diffraction (XRPD) measurement during crystallization of two typical first-generation chiral racemic compounds (1 and 2) showing an excellent PE phenomenon.

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