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Unformatted text preview: O + Problem 3 Propose a mechanism for the following transformation. N O CO 2 Et N O O NaH (Base) HCl H 2 O N enamine H N O Problem 4 Predict which of the following would be aromatic according to Hückel’s rules. Consider all possible tautomers . H O N N N H N N H 3 C CH 3 O O O N O CH 3 H 3 C Question 5 On the basis of resonance and aromaticity considerations, predict which of the following would have the lowest barrier to rotation about the indicated bond. O O...
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- Spring '09
- Chemical reaction, Amine, Carboxylic acid, H3C, following transformation