Diels-Alder reaction
(redirected from Alder-Stein rules)Also found in: Dictionary.
Diels-Alder reaction
[¦dēlz ¦äl·dər rē‚ak·shən] (organic chemistry)
The 1,4 addition of a conjugated diolefin to a compound, known as a dienophile, containing a double or triple bond; the dienophile may be activated by conjugation with a second double bond or with an electron acceptor.