(Solved): please answer question below Diels-Alder(DA) reactions tend to be reversible. While some heat is nee ...

Diels-Alder(DA) reactions tend to be reversible. While some heat is needed to catalyze the Diels-Alder reaction, excess amounts of heat will cause the reverse, retro Diels-Alder reaction. The products of a retro Diels-Alder reaction are diene and a dienophile. Pyrone is a diene that is locked into s-cis conformation, setting it up as a good diene to use in Diels-Alder reactions. When reacted with the following alkyne, a bicyclic DA product is made. When this DA product is heated further, a retro DA reaction cccurs, but it forms two new molecules: carbon dioxide and an aromatic ring. This retro DA is not reversible as carbon dioxide is a gas and is lost from the reaction flask. Draw the mechanism for both the DA and retro DA reactions.