Textbook Question
Given the following chair conformations, draw each in its planar form as if you were viewing it from above.
(d)
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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 39a
Mullins 1st EditionCh. 3 - Alkanes and Cycloalkanes: Properties and Conformational AnalysisProblem 39aChapter 2, Problem 39a
Draw two chair conformations of the molecules below. Indicate which is most stable.
(a) 
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Identify the molecule's structure and determine the substituents attached to the cyclohexane ring. Note the positions (axial or equatorial) of each substituent in the chair conformation.
Draw the first chair conformation of the cyclohexane ring. Place the substituents in their respective positions (axial or equatorial) based on the given structure.
Draw the second chair conformation by performing a ring flip. In a ring flip, all axial substituents become equatorial, and all equatorial substituents become axial.
Analyze the stability of each chair conformation. Stability is influenced by steric hindrance and 1,3-diaxial interactions. Substituents in the equatorial position generally result in a more stable conformation due to reduced steric strain.
Compare the two chair conformations and determine which one is more stable. Indicate the most stable conformation based on the positions of the substituents and their interactions.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chair Conformation
The chair conformation is a three-dimensional representation of cyclohexane that minimizes steric strain and torsional strain. In this conformation, the carbon atoms are arranged in a staggered manner, allowing for more stable interactions between substituents. Understanding chair conformations is crucial for predicting the stability of cyclohexane derivatives and their substituents.
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Understanding what a conformer is.
Stability Factors
The stability of chair conformations is influenced by factors such as steric hindrance and torsional strain. Steric hindrance occurs when bulky groups are positioned close to each other, leading to increased repulsion. Additionally, the orientation of substituents (axial vs. equatorial) affects stability, with equatorial positions generally being more favorable due to reduced steric interactions.
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Axial and Equatorial Positions
In chair conformations, substituents can occupy axial or equatorial positions. Axial substituents are aligned parallel to the axis of the ring, while equatorial substituents extend outward from the ring. The preference for equatorial positions arises because they minimize steric clashes with other axial substituents, making the overall conformation more stable.
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Related Practice
Textbook Question
Name the following cycloalkanes using the IUPAC system of nomenclature, being sure to indicate whether they are cis or trans.
(b)
2
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Textbook Question
Given the following chair conformations, draw each in its planar form as if you were viewing it from above.
(b)
4
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Textbook Question
Given the following chair conformations, draw each in its planar form as if you were viewing it from above.
(c)
1
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Textbook Question
Name the following cycloalkanes using the IUPAC system of nomenclature.
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Textbook Question
Rank the following compounds in order of their total heat of combustion. These compounds are constitutional isomers, each with a molecular formula of C6H12.
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