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Abstract
The Diels-Alder reactions between isoprene and N-phenylmaleimide catalysed by Lewis acids, in particular by aluminium chloride and by lithium perchlorate, have volumes of activation more negative than does the uncatalysed reaction. That between 9-anthracenemethanol and N-ethylmaleimide, is faster in water than in organic solvents and has a slightly more negative volume of activation in the aqueous medium than in organic. The significance of these measurements is discussed.