Textbook Question
How much more stable is the most stable staggered conformer than the most stable eclipsed conformer?
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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 76d
Bruice 8th EditionCh. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and StructureProblem 76dChapter 4, Problem 76d
How much more stable is the most stable staggered conformer than the least stable eclipsed conformer?
Verified step by step guidance1
Identify the molecule in question and determine the type of conformational analysis required (e.g., ethane, propane, butane, etc.). This will help establish the torsional strain and steric interactions involved in the conformers.
Understand the energy differences between staggered and eclipsed conformers. Staggered conformers are generally more stable due to minimized torsional strain, while eclipsed conformers are less stable due to increased torsional strain and steric hindrance.
Determine the specific interactions in the least stable eclipsed conformer. For example, in butane, the least stable eclipsed conformer may involve the interaction of two bulky groups (e.g., methyl groups) directly aligned, leading to significant steric hindrance.
Analyze the most stable staggered conformer. This conformer typically has bulky groups positioned as far apart as possible, minimizing steric hindrance and torsional strain.
Calculate the energy difference between the least stable eclipsed conformer and the most stable staggered conformer using experimental data or standard values for torsional strain and steric interactions. This energy difference represents the stability difference between the two conformers.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Conformational Isomerism
Conformational isomerism refers to the different spatial arrangements of atoms in a molecule that can be interconverted by rotation around single bonds. In organic chemistry, this concept is crucial for understanding how molecules can adopt various shapes, which significantly influence their stability and reactivity.
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Understanding what a conformer is.
Staggered and Eclipsed Conformers
Staggered and eclipsed conformers are specific arrangements of atoms in a molecule, particularly in alkanes. Staggered conformers have groups positioned as far apart as possible, minimizing steric strain, while eclipsed conformers have groups aligned with each other, leading to increased steric hindrance and higher energy states, making them less stable.
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Stability and Energy in Conformers
The stability of conformers is directly related to their energy levels; lower energy states correspond to more stable conformers. The energy difference between the most stable staggered conformer and the least stable eclipsed conformer quantifies the stability, with the staggered conformer being significantly lower in energy due to reduced steric interactions.
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Related Practice
Textbook Question
For each of the following compounds, determine whether the cis isomer or the trans isomer is more stable.
a.
b.
c.
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Textbook Question
Draw the most stable conformer of the following molecule. (A solid wedge points out of the plane of the paper toward the viewer. A hatched wedge points back from the plane of the paper away from the viewer.)
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Textbook Question
How many ethers have molecular formula C5H12O? Draw their structures and give each a systematic name. What are their common names?
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Textbook Question
Draw the conformer that is present in greatest concentration.
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Textbook Question
Draw a potential energy diagram for rotation about the C¬C bond of 1,2-dichloroethane through 360°, starting with the least stable conformer. The anti conformer is 1.2 kcal/mol more stable than a gauche conformer. A gauche conformer has two energy barriers, 5.2 kcal/mol and 9.3 kcal/mol.
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