Diels-Alder reactions in water

This review illustrates how water, as an environmentally friendly solvent, can have significant additional benefits when it is used as a solvent for t he Diels-Alder reaction. The mechanism by which the unique properties of wa ter enhance the rate and selectivity are discussed. Also, possibilities for the achievement of further increases in rate and enantioselectivity of aqu eous Diels-Alder reactions through Lewis-acid and micellar catalysis are re viewed.