Draw the products of Diels-Alder reaction of maleic anhydride with α-phellandrene, β- phellandrene, and α-terpinene, assuming that endo product is formed. In each structure, mark all chiral carbons present (if any).
Answer – We are given that maleic anhydride and we need to draw the products of Diels-Alder reaction of maleic anhydride with α-phellandrene, β- phellandrene, and α-terpinene. When maleic anhydride is reacted with α-phellandrene there is dienophile acts as maleic anhydride and dienes acts as each α-phellandrene, β- phellandrene, and α-terpinene. Then there is form the Diels-Alder reaction product with 4n+2 pi electron ring closing as follow -
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