Instead we will define it in relation to substituents on the diene and dienophile. (We will explain the orbital origin of this rule shortly.) The Alder Endo Rule states the the electron withdrawing gr...Instead we will define it in relation to substituents on the diene and dienophile. (We will explain the orbital origin of this rule shortly.) The Alder Endo Rule states the the electron withdrawing group on the dienophile (W group) ends up cis to groups pointing "outside" the diene in the cyclohexene product.
