The Diels‐Alder reaction is a cycloaddition reaction between a conjugated diene and an alkene. This reaction produces a 1,4‐addition product. A typical example is the reaction of 1,3‐butadiene with maleic anhydride.

The Diels-Alder reaction is a conjugate addition reaction of a conjugated diene to an alkene or alkyne (the dienophile) to produce a cyclohexene.

Furan and maleic anhydride react to form a bicyclic Diels-Alder adduct. The bicyclic product can have either endo or exo stereochemistry. In Diels-Alder reactions the endo product forms faster - it has a lower energy transition state due to favorable pi orbital overlap.

The Diels-Alder reaction between cyclopentadiene and maleic anhydride can produce two possible products, the 'endo' and the 'exo' adducts. This is because although the hydrogens of the maleic anhydride must be cis in the product, there are two possible arrangements where this is true.

Cyclopentadiene is the limiting reagent by a small margin. A 100% theoretical yield should be 0.00303 mols of product since cyclopentadiene gets fully consumed first. The actual yield is 0.00228 mols .

The Diels–Alder reaction is the reaction between a conjugated diene and an alkene (dienophile) to form unsaturated six-membered rings. Since the reaction involves the formation of a cyclic product via a cyclic transition state, it is also referred to as a "cycloaddition".

The Diels‐Alder reaction is a cycloaddition reaction between a conjugated diene and an alkene. This reaction produces a 1,4‐addition product. A typical example is the reaction of 1,3‐butadiene with maleic anhydride.