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

28. Carbohydrates

Monosaccharides - Cyclization

Organic Chemistry

28. Carbohydrates

Monosaccharides - Cyclization

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Multiple Choice

Draw the β-anomer predicted through the cyclization of D-mannose

Beta-anomer of D-Mannose showing the cyclic structure with hydroxyl groups.

Another view of the beta-anomer of D-Mannose with hydroxyl groups labeled.

Detailed view of the beta-anomer of D-Mannose highlighting hydroxyl groups.

Alternative representation of the beta-anomer of D-Mannose with hydroxyl groups.

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Verified step by step guidance

Identify the structure of D-mannose, which is an aldohexose with the hydroxyl groups on the right at C2 and C3, and on the left at C4 and C5 in its Fischer projection.

Understand that cyclization involves the formation of a hemiacetal, where the hydroxyl group on C5 attacks the carbonyl carbon (C1) to form a six-membered pyranose ring.

Determine the configuration of the anomeric carbon (C1) in the β-anomer. In the β-anomer, the hydroxyl group on the anomeric carbon is on the same side as the CH2OH group at C5 in the Haworth projection.

Draw the pyranose ring with the oxygen atom at the top right. Place the CH2OH group at C5 above the plane of the ring, indicating the D-configuration.

Position the hydroxyl group on the anomeric carbon (C1) above the plane of the ring to represent the β-anomer. Ensure that the other hydroxyl groups are placed according to the stereochemistry of D-mannose.