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

4. Alkanes and Cycloalkanes

Naming Alkenes

Organic Chemistry

4. Alkanes and Cycloalkanes

Naming Alkenes

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0:57 minutes

Problem 27b

Textbook Question

Identify the allylic carbon(s) in the following molecules.
(b)

Verified step by step guidance

Step 1: Understand the concept of allylic carbons. Allylic carbons are the carbons directly adjacent to a carbon-carbon double bond. These carbons are bonded to the sp2-hybridized carbon of the double bond and are often involved in resonance stabilization.

Step 2: Locate the carbon-carbon double bond in the molecule. In the given structure, the double bond is present between two carbons in the central part of the molecule.

Step 3: Identify the carbons directly adjacent to the double bond. These are the carbons bonded to the sp2-hybridized carbons of the double bond. Look for single bonds connecting to the double-bonded carbons.

Step 4: Examine the structure carefully. The carbon on the left of the double bond and the carbon on the right of the double bond are both allylic carbons because they are directly adjacent to the double bond.

Step 5: Verify the substituents attached to the allylic carbons. The allylic carbon on the left has a methyl group attached, while the allylic carbon on the right has a bromine atom attached. This confirms their positions as allylic carbons.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Allylic Carbons

Allylic carbons are the carbon atoms that are directly adjacent to a carbon-carbon double bond. In organic chemistry, these carbons are significant because they can participate in various reactions, such as allylic substitutions, due to their unique reactivity. Identifying allylic carbons is crucial for understanding reaction mechanisms and predicting the outcomes of chemical reactions.

Structural Representation of Molecules

The structural representation of molecules, such as Lewis structures or skeletal formulas, provides a visual way to understand the arrangement of atoms and bonds within a compound. This representation helps in identifying functional groups, stereochemistry, and specific carbon types, including allylic carbons. A clear understanding of these structures is essential for analyzing chemical behavior and reactivity.

Reactivity of Allylic Positions

The reactivity of allylic positions is a key concept in organic chemistry, as these positions can undergo various reactions, including nucleophilic substitutions and radical reactions. The presence of a double bond near the allylic carbon increases its reactivity due to the stability of the resulting intermediates. Understanding this reactivity is important for predicting how molecules will behave in chemical reactions.

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