Abstract
Experimental data on the kinetics of elementary gas-phase reactions undergone by molecules are reviewed. The classificationof reactions is discussed on the basis of the structure of activated complexes. Reaction mechanisms of various types areanalysed in detail. The activation energy is shown to be determined additively mainly by activated bonds: the presence ofsubstituents, which play no direct part in the reaction, has little effect on the activation energy. An analysis is made of theeffect of conjugated and cumulative π-bonds in the activated complex on the activation energy. Conjugation and cumulationsubstantially lower the potential barrier to reaction. A list of 206 references is included.
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