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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2:09 minutes

Problem 9a

Textbook Question

Provide the IUPAC names for the following alkenes.
(a)

Verified step by step guidance

Step 1: Identify the longest continuous carbon chain that contains the double bond. This chain will serve as the parent chain, and its name will be based on the number of carbons in the chain (e.g., ethene, propene, butene, etc.).

Step 2: Number the carbon atoms in the parent chain starting from the end closest to the double bond. This ensures that the double bond gets the lowest possible locant (position number).

Step 3: Identify and name any substituents (alkyl groups or other functional groups) attached to the parent chain. Assign each substituent a locant based on its position on the parent chain.

Step 4: Combine the substituent names and locants with the parent chain name. Place the locants of the double bond(s) before the parent chain name, and use the suffix '-ene' to indicate the presence of a double bond. If there are multiple double bonds, use prefixes such as 'diene,' 'triene,' etc., and include all locants for the double bonds.

Step 5: Ensure the name follows IUPAC rules, including alphabetical order for substituents and proper use of hyphens and commas. Double-check that the double bond locant is as low as possible.

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Key Concepts

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

IUPAC Nomenclature

IUPAC nomenclature is a systematic method for naming organic chemical compounds. It provides rules for naming alkenes based on the longest carbon chain containing the double bond, the position of the double bond, and substituents. Understanding these rules is essential for accurately identifying and naming alkenes.

Alkenes

Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C=C). They are unsaturated compounds, which means they have fewer hydrogen atoms than alkanes with the same number of carbon atoms. Recognizing the structure and properties of alkenes is crucial for their correct naming and understanding their reactivity.

Numbering the Carbon Chain

In IUPAC nomenclature, the carbon chain must be numbered to give the double bond the lowest possible number. This involves identifying the longest continuous chain of carbon atoms and assigning numbers to each carbon, starting from the end closest to the double bond. This step is vital for determining the correct name of the alkene.

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