Fill in the missing structure(s) for the reaction pathways shown below. Provide
all starting material(s), reagent(s), or product(s). If more than one product can be
formed, draw all major products. If more than one starting material or reagent is
possible, write all starting materials or reagents. Include stereochemistry in your
answer, if applicable, and draw all stereoisomers.
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The first three reactions are examples of Diels-Alder reaction. This is a photochemical reaction occurs between a diene and a dienophile in presence of the heat or light. It is also a regioselective and stereo selective reaction.
The S-cis conformation of diene only participates in this reaction.
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