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The initial state of the DielsAlder reaction is significantly destabilised in water relative to organic solvents, due to the relatively unfavourable solvation of the apolar moieties in aqueous solution. During the activation process the apolar character of the groups near the reaction centre is largely lost9. Consequently, the transition state is hardly destabilised by water and, hence, the reaction is accelerated. The term “enforced” has been introduced to stress the fact that it is the occurrence of the organic reaction that gives rise to the hydrophobic interaction, whereas the hydrophobic interaction is, in itself, not strong enough to bring the reactants together.

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