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A specialized set consisting of about 1,900 organic reactions has been analyzed to determine the distribution of reaction matrices R̃ according to a mathematical model of chemistry. The dynamical properties of the data-base have a very uneven (exponential) distribution. The results conform to the overall pattern of previous more restricted random sample analyses. A subset of ten R̃-matrices accounts for over 92% of the one-step interconversions between chemically stable or well-defined species which describe a reaction sequence. The implications of the findings for synthesis-planning are set out.

Organic Reaction Schemes and General Reaction-Matrix Types, III A Quantitative Analysis