Textbook Question
Which stereoisomers are optically inactive?
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Ch. 4 - Isomers: The Arrangement of Atoms in Space
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
Chapter 5, Problem 90(5-8)
Identify
5. achiral compounds
6. meso compounds
7. enantiomers
8. diastereomers
Verified step by step guidance1
Step 1: To identify achiral compounds, look for molecules that lack a chiral center or have a plane of symmetry. For example, ethylcyclopentane (structure i) is achiral because it has no chiral centers.
Step 2: To identify meso compounds, look for molecules with multiple chiral centers that have an internal plane of symmetry, making them achiral despite having chiral centers. For example, (1R,3S)-1,3-dimethylcyclopentane (structure iv) is a meso compound due to its symmetry.
Step 3: To identify enantiomers, look for pairs of molecules that are non-superimposable mirror images of each other. For example, (1R,2S)-1,2-dimethylcyclopentane (structure iii) and its mirror image (not shown here) would be enantiomers.
Step 4: To identify diastereomers, look for stereoisomers that are not mirror images of each other. For example, trans-1,2-dimethylcyclopentane (structure v) and cis-1,2-dimethylcyclopentane (structure vi) are diastereomers.
Step 5: Analyze each structure systematically to confirm the presence or absence of chirality, symmetry, and stereoisomeric relationships. Use the definitions of achiral, meso, enantiomers, and diastereomers to classify each compound accurately.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chirality
Chirality refers to the geometric property of a molecule that makes it non-superimposable on its mirror image. A chiral molecule typically has at least one carbon atom bonded to four different substituents, resulting in two distinct enantiomers. Understanding chirality is crucial for distinguishing between compounds that may have identical molecular formulas but different spatial arrangements, leading to different chemical properties.
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What is chirality?
Stereoisomers
Stereoisomers are compounds that have the same molecular formula and connectivity of atoms but differ in the spatial arrangement of their atoms. This category includes enantiomers, which are non-superimposable mirror images, and diastereomers, which are not mirror images of each other. Recognizing stereoisomers is essential for understanding the behavior of molecules in biological systems and their reactivity in chemical reactions.
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01:58Determining when molecules are stereoisomers.
Meso Compounds
Meso compounds are a specific type of stereoisomer that contain multiple chiral centers but are achiral due to an internal plane of symmetry. This means that despite having chiral centers, the overall molecule does not exhibit optical activity. Identifying meso compounds is important in stereochemistry as they can often be mistaken for chiral compounds, affecting their classification and reactivity.
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04:10The 3 rules of meso compounds.
Related Practice
Textbook Question
What is the configuration of the asymmetric centers in the following compounds?
a.
b.
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Textbook Question
Identify
1. constitutional isomers
2. stereoisomers
3. cis–trans isomers
4. chiral compounds
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Textbook Question
Draw all the isomers with molecular formula C6H12 that contain a cyclobutane ring.
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Textbook Question
Are the following pairs identical, enantiomers, diastereomers, or constitutional isomers?
a.
b.
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Textbook Question
A compound has a specific rotation of -39.0. A solution of the compound (0.187 g/100 mL) has an observed rotation of -6.52° when placed in a polarimeter tube 10 cm long. What is the percent of each enantiomer in the solution?
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