Analysis of Influence of the Growth of Spatial Inhomogeneity on Enantiomeric Excess in Chirally Autocatalytic Chemical System

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In Soai reaction, pyrimidinealdehyde derivative reacts with diisopropylzinc to synthesize chiral alcohol. Mechanism of the spontaneous random generation of enantiomeric excess in the product by this reaction was investigated. Side reaction, addition of diisopropylzinc to the aromatic ring of pyrimidinealdehyde, was found to progress simultaneously with the chirally autocatalytic Soai reaction. The two competitive chemical processes lead to the bifurcation phenomenon. Even if the reaction was carried out at the same condition, high yield of the chiral alcohol having high enantiomeric excess was generated in some experiments, while low yield of the chiral alcohol having low enantiomeric excess was generated in the other experiments. Attempts were made to analyze the bifurcation behavior by creating nonlinear chemical dynamics model.