Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

16. Conjugated Systems

Reactions at the Allylic Position

Organic Chemistry

16. Conjugated Systems

Reactions at the Allylic Position

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Multiple Choice

Draw the structures of products A and B for the given reactions.

missing structures

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Verified step by step guidance

Identify the starting material and reagents for each reaction. The starting material is a diol with a cyclopentene ring. The first reaction uses PCC (pyridinium chlorochromate) in CH₂Cl₂, and the second reaction uses MnO₂ in CH₂Cl₂.

Understand the role of PCC in organic reactions. PCC is a mild oxidizing agent commonly used to oxidize primary alcohols to aldehydes and secondary alcohols to ketones without over-oxidizing to carboxylic acids.

Apply the PCC oxidation to the starting material. The diol has two hydroxyl groups, one of which is a secondary alcohol. PCC will oxidize this secondary alcohol to a ketone, while the primary alcohol remains unchanged.

Consider the second reaction with MnO₂. MnO₂ is a selective oxidizing agent for allylic alcohols, converting them to the corresponding aldehydes or ketones. In this case, the allylic alcohol will be oxidized to an aldehyde.

Draw the structures of products A and B based on the transformations. Product A will have a ketone group where the secondary alcohol was, and product B will have an aldehyde group where the allylic alcohol was.