Dienophile

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A dienophile, literally diene-loving, refers to a compound that reacts with the diene component in a Diels-Alder reaction. In a classic Diels-Alder reaction one molecule has two conjugated double bonds, for example 1,3-butadiene, and this reacts with a molecule with one double bond, for example propylene. The first component is called the diene and the second is called the dienophile.

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Not all molecules with one double bonds act as dienophiles; only when a molecule readily reacts with a molecule that has two conjugated double bonds in a Diels-Alder manner is it considered a dienophile. It is worth noting that the number of cyclic rings present in the product is always one more than was present totally in the reactants.

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