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Solutions to Problems . 293 60. (a) (b) + (cis and trans) (c) (d) + (both as mixtures of stereoisomers) (e) + (both as mixtures of stereoisomers) (f) H (g) 61. Taking note of the recall from Section 14-8 in particular that alkenes containing electron-withdrawing groups are especially good dienophiles in Diels-Alder reactions. So, OH 0 + + Good dienophile The synthesis. therefore. would go as follows: 0 OH 1. ether 2. H₂O + 0 COCH₃ COCH₃ N N 62. (a) N N COCH₃ CH₃ CH₃ H COCH₃ N (b) N COCH₃ CH₃ CH₃ H 0