Chiral autocatalysis is the system in which each enantiomer acts as a catalyst for its own production and an anticatalyst for the production of the other enantiomer. Predominant production of one enantiomer would occur if the reaction system involved chiral autocatalysis, since a slight difference between each enantiomer, which arises in the early stage of the reaction by statistical fluctuation could be augmented as the reaction proceeds. Some enantiomeric predominant products could be experimentally obtained by chirally autocatalytic secondary nucleation.