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- Draw 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.Identify A in the following reaction scheme, and draw a stepwise mechanism for the conversion of A to the furan B.How does an SN1 reaction mechanism form answers A and C?
- A B ) Which of the above molecules (A or B) have a higher rate of reaction towards aromatic electrophilic reaction? Explain your answer.The resonance stabilized carbocation formed in step one has two electrophilic centers draw. The final step of the mechanism is in both provided resonance structures. Draw a stepwise mechanism for the attached reaction. (Hint: Conjugateaddition can occur with heteroatoms as well as carbon nucleophiles.)
- For each of the followung reaction, determine if diasteromer A or diasreromer B forms in greater yeild explain why.1.Detailed mechanism for the reaction. 2. Why will the electrophile not undergo rearrangmen? 3. What is the structure if the byproduct? 4. What is the difference in polarity between the starting material and product?...Draw the organic product of each reaction (a, b and c)
- A. Write appropriate reagents over the reaction arrow B. As a result of this reaction, is the N made more nucleophilic or less nucleophilic?Explain the E2 mechanism (bimolecular elimination) of of Elimination ?Draw a stepwise mechanism for the attached reaction, which involves two Friedel–Crafts reactions. B was an intermediate in the synthesis of the antidepressant sertraline