Predict the products of the following Diels-Alder reaction:

(b)

Diels-Alder reaction was discovered by the German chemists Otto Diels and Kurt-Alder in 1928. Diels-Alder reaction is an important cycloaddition reaction which is stereospecific. It includes a substituted alkene in the form of a dienophile and a conjugated diene. It proceeds via concerted mechanism. Diels alder reaction can be used to generate 6 membered rings since there is a simultaneous construction of two new Carbon-carbon bonds.Stereochemistry of the dienophile is retained.

Diene is an organic compound which comprises of two conjugated pi bonds (4 pi bonds) while dienophile is a diene loving compound containing 2 pi electrons.

The Diene is

The dienophile is,

The reaction is stereospecific (single stereoisomer is obtained) .Endo product is formed as a result of Diels-Alder reaction. A substituent on one bridge is endo when it is cis to the larger of the other two bridges.