The acceleration of a chemical transformation at one site of a molecular entity through the involvement of another functional ('catalytic') group in the same molecular entity, without that group appearing to have undergone change
in the reaction product. The use of the term should be restricted to cases for which
analogous intermolecularcatalysis by chemical species bearing that catalytic group is observable. Intramolecularcatalysis can be detected and expressed in quantitative form by a comparison of the reaction
rate with that of a comparable model compound in which the catalytic group is absent,
or by measurement of the effective molarity of the catalytic group.