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

5. Chirality

R and S Configuration

Organic Chemistry

5. Chirality

R and S Configuration

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6:11 minutes

Problem 9

Textbook Question

Write structural formulas for the following compounds (includes both old- and new-style names).(j) vinylacetylene(k) (S)-3-methyl-1-penten-4-yne

Verified step by step guidance

Identify the structure of vinylacetylene: Vinylacetylene is also known as 1-buten-3-yne. It consists of a four-carbon chain with a double bond between the first and second carbons and a triple bond between the third and fourth carbons.

Draw the structure for vinylacetylene: Start by drawing a four-carbon chain. Add a double bond between C1 and C2, and a triple bond between C3 and C4.

Identify the structure of (S)-3-methyl-1-penten-4-yne: This compound is a five-carbon chain with a triple bond between C1 and C2, a double bond between C4 and C5, and a methyl group attached to C3. The (S) configuration indicates the stereochemistry at C3.

Draw the structure for (S)-3-methyl-1-penten-4-yne: Begin by drawing a five-carbon chain. Add a triple bond between C1 and C2, and a double bond between C4 and C5. Attach a methyl group to C3. Ensure the stereochemistry at C3 is (S) by arranging the substituents in order of priority and using the Cahn-Ingold-Prelog rules.

Verify the stereochemistry: Check that the configuration at C3 is indeed (S) by assigning priorities to the substituents and ensuring the lowest priority group is oriented away from you.

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Key Concepts

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

Structural Formulas

Structural formulas represent the arrangement of atoms within a molecule, illustrating how atoms are bonded together. They provide insight into the molecular geometry and functional groups present, which are crucial for understanding the compound's reactivity and properties. Familiarity with drawing structural formulas is essential for accurately depicting organic compounds.

Nomenclature in Organic Chemistry

Nomenclature refers to the systematic naming of organic compounds based on established rules, such as those set by IUPAC. Understanding both old-style and new-style names is important for recognizing and converting between different naming conventions. This knowledge aids in identifying the structure and functional groups of the compounds in question.

Stereochemistry

Stereochemistry is the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the context of (S)-3-methyl-1-penten-4-yne, the 'S' designation indicates a specific three-dimensional configuration of the molecule. Recognizing stereochemical descriptors is vital for understanding isomerism and the properties of chiral compounds.

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