14. Please write the major product for each following Diels-Alder reaction. Explain why they are formed by using Frontier Molecular Orbital theory. (a) 1-(diethylamino)-1,3-butadiene + acrylate (b) 2-ethoxy-1,3-butadiene + acrylate Moreover, draw Molecular Orbitals of 1-(diethylamino)-1,3-butadiene, 2-ethoxy-1,3-butadiene & acrylate. In addition, mark energy levels and predict the products by using FMO theory.

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