Diels Alder with Alkynes

Alkynes can act as dienophiles in the Diels-Alder reaction. The reaction between diene and alkyne forms a 1,4-cyclohexadiene.

1,3-Butadiene [1] reacts with diethyl butynedioate [2] to form diethyl cyclohexa-1,4-diene-1,2-dicarboxylate [3].