Question

3. Provide a step-by-step mechanism to account for the product of each of the following reactions. Show the structure of each of the intermediates and use curved arrows to indicate electron flow in each of these steps.

4. Provide two different ways that 5-methylhept-4-en-3-one could be prepared, starting with a ketone or a Weinreb amide.

Na OMe (cat.) MeOH