Abstract
The title salt crystallises as a conglomerate (space group P212121, Z = 4) with one solvate CHCl3 molecule forming strong shortened contact with I– [Cl···I– 3.599(2) Å]. Therefore, it undergoes spontaneous resolution by simple crystallisation with a deficiency of the conglomerator CHCl3 or by an internal entrainment procedure. It exhibits the (S)-(+) absolute configuration and racemises in solution (ΔG#rac = 26.5 kcal mol–1). The salt was almost completely converted into one enantiomer by stirred crystallisation from solution (with full evaporation) or from a melt under conditions of enantiomerisation. The contribution of autocatalysis to this process is discussed.
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