Textbook Question
Name the following cycloalkanes using the IUPAC system of nomenclature. [Hint: Each molecule exemplifies one of the cycloalkane nomenclature rules in Table 3.10.]
(a) rule 1
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Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases: Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
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Mullins 1st EditionCh. 3 - Alkanes and Cycloalkanes: Properties and Conformational AnalysisProblem 29a
Mullins 1st EditionCh. 3 - Alkanes and Cycloalkanes: Properties and Conformational AnalysisProblem 29aChapter 2, Problem 29a
Choose the conformation in each pair that is most stable. If both are equally stable, then write 'no difference.'
(a) 
Verified step by step guidance1
Analyze the two cyclohexane chair conformations provided in the image. Note the positions of the substituents, particularly the methyl group (CH₃) and hydrogen atoms (H). Determine whether the substituents are in axial or equatorial positions.
Recall that substituents in the equatorial position experience less steric hindrance compared to those in the axial position due to reduced 1,3-diaxial interactions. This makes equatorial positions more stable for bulky groups like CH₃.
In the first conformation (left), the methyl group (CH₃) is in the equatorial position, while in the second conformation (right), the methyl group is in the axial position.
Compare the steric hindrance in both conformations. The first conformation (left) is more stable because the bulky methyl group is in the equatorial position, minimizing steric interactions.
Conclude that the most stable conformation is the one where the methyl group is in the equatorial position (left conformation).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Conformational Analysis
Conformational analysis involves studying the different spatial arrangements of atoms in a molecule that can be interconverted by rotation around single bonds. This analysis helps in understanding the stability of various conformations based on steric interactions, torsional strain, and angle strain. Identifying the most stable conformation is crucial for predicting the behavior and reactivity of organic compounds.
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03:29
Understanding what a conformer is.
Steric Hindrance
Steric hindrance refers to the repulsion between atoms that occurs when they are brought close together, which can destabilize certain conformations. In organic molecules, bulky groups can create steric strain, making some conformations less favorable than others. Understanding steric hindrance is essential for determining which conformation is more stable in a given pair.
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02:53Understanding steric effects.
Torsional Strain
Torsional strain arises from the eclipsing interactions between atoms or groups in a molecule when they are aligned in a way that increases electron repulsion. This strain is particularly relevant in conformations where bonds are eclipsed rather than staggered. Recognizing torsional strain helps in evaluating the stability of different conformations and predicting which will be favored in a molecular structure.
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Related Practice
Textbook Question
Calculate the total strain in the eclipsed conformations shown.
(b)
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Textbook Question
Calculate the total strain in the eclipsed conformations shown.
(a)
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Textbook Question
Name the following cycloalkanes using the IUPAC system of nomenclature. [Hint: Each molecule exemplifies one of the cycloalkane nomenclature rules in Table 3.10.]
(c) rule 2
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Textbook Question
Would you expect a CH3/CH3 eclipsing interaction to be larger or smaller than 1.3 kcal/mol?
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Textbook Question
For each of the pairs in Assessment 3.29, which conformation would you expect to be more prominent at equilibrium?
(a)
(b)
(c)
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