Show the mechanism for the transformation in the image, include the starting material needed to create the circled molecule using a Claisen Rearrangement. :ÖH S HEAT HO:
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- Vitamin C is a stable enediol. Draw the structure of the two ketotautomers in equilibrium with the enediol, and explain why the enediol ismore stable than the other tautomers3. Draw a stepwise detailed mechanism for the following reaction showing all the substitution and the elimination products formed. Label the type of the mechanism (SN1, SN2, E1 or E2). Show stereochemistry when applicable. Br "D CH₂CH₂OH H₂O thor throughDraw a stepwise mechanism for the following Robinson annulation. This reaction was a key step in a synthesis of the steroid cortisone by R. B. Woodward and co-workers at Harvard University in 1951.
- 4. Draw the keto tautomer of each of the following enols: но ноOne acetal can be converted to a different acetal by reaction with a diolin the presence of acid, a process called transacetalization. Draw astepwise mechanism for the following transacetalization.When 1-methoxy-2-methylpropene is treated with HCl, the major product is 1-chloro-1-methoxy-2-methylpropane. Although this reaction proceeds via an iconic mechanism, the Cl is ultimately positioned at the less substituted carbon. Draw a mechanism with this outcome and explain why the less substituted carbonation intermediate is more stable. Explanation: The less substituted carbonation has better stabilization because of a. resonance b. electron donation by the methyl groups c. reduced steric hindrance d. electron withdrawal by the methyl groups while the more substituted carbon is only stabilized by: a. resonance b. electron donation by the methyl groups c. reduced steric hindrance d. electron withdrawal by the methyl groups