A concerted cycloaddition of a conjugated diene and a dienophile that makes a six-membered ring with two new sigma bonds and one retained alkene. The internal diene atoms become the residual alkene atoms.
A common kinetic preference for an orientation with dienophile substituents directed beneath the diene pi system. Steric and orbital interactions compete, so endo preference is not an absolute rule.
A reagent combination that installs the two saturated carbons of an ethylene cycloaddition while allowing more favourable reactivity. A removable electron-withdrawing substituent can activate the dienophile and be removed later.
A preference for the cycloaddition orientation in which relevant dienophile substituents lie under the diene framework in the transition geometry. It is distinct from regiochemistry and is not an unconditional guarantee of one product.
The unsaturated partner that combines with a conjugated diene in a Diels–Alder reaction. Electron-withdrawing substituents often enhance reactivity in a normal-electron-demand process.
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