Textbook Question
Is each of the following a cis isomer or a trans isomer?
a,
b.
c.
Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure
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
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Bruice 8th EditionCh. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and StructureProblem 45
Bruice 8th EditionCh. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and StructureProblem 45Chapter 4, Problem 45
Draw 1,2,3,4,5,6-hexachlorocyclohexane with
a. all the chloro groups in axial positions.
b. all the chloro groups in equatorial positions.
Verified step by step guidance1
Step 1: Begin by understanding the structure of cyclohexane. Cyclohexane is a six-membered ring that can adopt a chair conformation, which is the most stable conformation. In this conformation, each carbon atom has one axial position (pointing up or down, perpendicular to the ring) and one equatorial position (pointing outward, roughly parallel to the plane of the ring).
Step 2: For part (a), where all chloro groups are in axial positions, identify the six axial positions on the cyclohexane chair conformation. These alternate between pointing up and down around the ring. Place a chlorine atom at each of these axial positions.
Step 3: For part (b), where all chloro groups are in equatorial positions, identify the six equatorial positions on the cyclohexane chair conformation. These alternate between pointing outward and slightly upward or downward around the ring. Place a chlorine atom at each of these equatorial positions.
Step 4: Ensure that the placement of the chloro groups respects the stereochemistry of the chair conformation. Axial positions are perpendicular to the ring, while equatorial positions are angled outward. Double-check that all six chlorine atoms are correctly placed in either axial or equatorial positions as specified in parts (a) and (b).
Step 5: Draw the final structures for both cases. For part (a), the structure will show all chlorine atoms in axial positions, alternating up and down. For part (b), the structure will show all chlorine atoms in equatorial positions, alternating outward and slightly upward or downward. Label the positions clearly to avoid confusion.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chair Conformation of Cyclohexane
Cyclohexane can adopt a chair conformation that minimizes steric strain. In this conformation, substituents can occupy either axial (pointing up or down) or equatorial (pointing outward) positions. The arrangement of substituents affects the stability of the molecule, with equatorial positions generally being more stable due to reduced steric hindrance.
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What is a chair conformation?
Axial vs. Equatorial Substituents
In cyclohexane derivatives, substituents can be positioned axially or equatorially. Axial substituents are aligned parallel to the axis of the ring, while equatorial substituents extend outward from the ring. The choice of position significantly influences the molecule's overall stability and reactivity, as axial substituents can lead to 1,3-diaxial interactions, increasing steric strain.
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Stereoisomerism in Substituted Cyclohexanes
Stereoisomerism occurs when compounds have the same molecular formula but differ in the spatial arrangement of atoms. In the case of hexachlorocyclohexane, the positioning of the six chlorine atoms can lead to different stereoisomers, depending on whether they are all in axial or equatorial positions. Understanding these arrangements is crucial for predicting the physical and chemical properties of the compound.
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Related Practice
Textbook Question
Using Newman projections, draw the most stable conformer for each of the following:
c. 3,3-dimethylhexane, viewed along the C-3---C-4 bond
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Textbook Question
Verify the strain energy shown in Table 3.8 for cycloheptane
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Textbook Question
The chair conformer of fluorocyclohexane is 0.25 kcal/mol more stable when the fluoro substituent is in an equatorial position than when it is in an axial position. How much more stable is the anti conformer than a gauche conformer of 1-fluoropropane, considering rotation about the C1−C2 bond?
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Textbook Question
Using the data in Table 3.9, calculate the percentage of molecules of cyclohexanol that have the OH group in an equatorial position at 25 °C.
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Textbook Question
The bond angles in a regular polygon with n sides are equal to 180° - 360°/n
a. What are the bond angles in a regular octagon?
b. What are the bond angles in a regular nonagon?
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