plural of red alder

A deciduous shrub, Frangula alnus, native to Europe and neighboring areas of Asia and Africa, bearing glossy leaves, flowers in sessile umbels, and inedible red berries that turn black when ripe, and historically used as a laxative and to produce dyes.

plural of Diels-Alder reaction

A deciduous holly shrub, Ilex verticillata, native to eastern North America, growing best in moist circumstances.

(organic chemistry) The cycloaddition reaction between a conjugated diene and an alkene to form a cyclohexene ring.