A substituted alkene and a conjugated diene are reactants in the significant organic chemical process known as the Diels-Alder reaction.
A dienophile is a term used to describe this substituted alkene.
A substituted derivative of cyclohexene results from this reaction.
Furan undergoes a Diels-Alder reaction:
Furan due to the presence of the lone pairs in oxygen molecule and conjugated double bonds forms an aromatic system and acts as a diene in the Diels elder reaction.
A particularly good illustration of pericyclic reactions that take place through coordinated mechanisms is the Diels-Alder reaction.
