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The physico-chemical conditions under which a system that is initially racemic (or without chiral constituents) can spontaneously evolve into a homochiral or almost homochiral terminal state is a topic that has been investigated for a long time.1,2 It is directly related to the puzzle of how homochirality of the biomolecules in modern terrestrial life forms could have evolved from the racemic “primordial soup”. The problem gained a great deal in importance after such phenomena were experimentally observed, first in the crystallization of sodium chlorate3–5 and other compounds,6 and, independently, within certain autocatalytic chemical reactions.7,8 Long before these experiments were performed, Frank had already demonstrated9 that a very simple kinetic scheme may lead to spontaneous chiral stereoselection. Eventually, numerous modifications and amendments of the Frank model were put forward.10–23 Some time ago Klemm considered12,23 a general expression for the time-evolution of a system containing n x moles of one enantiomer (say, R) and n(1 – x) moles of the other enantiomer (say, S):

On the Klemm model for bistability of mixtures of interacting enantiomers