Domanda del libro di testo
Draw the two chair conformers for each of the following and indicate which conformer is more stable:
c. trans-1-ethyl-2-isopropylcyclohexane
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Ch. 3 - An Introduction to Organic Compounds: Nomenclature, Physical Properties, and Structure
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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TOC.tableOfContents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding31
- 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 StructureProblema 74d
Bruice 8th EditionCh. 3 - An Introduction to Organic Compounds: Nomenclature, Physical Properties, and StructureProblema 74dCapitolo 3, Problema 74d
Draw the two chair conformers for each of the following and indicate which conformer is more stable:
d. cis-1,2-diethylcyclohexane
Guida verificata passo dopo passo1
Step 1: Begin by understanding the structure of cyclohexane and its chair conformations. Cyclohexane can adopt two chair conformations, which are interconvertible through a ring flip. Each carbon atom in the chair conformation has two substituent positions: axial (pointing up or down, perpendicular to the ring) and equatorial (pointing outward, roughly parallel to the ring plane).
Step 2: Analyze the substituents in cis-1,2-diethylcyclohexane. The 'cis' designation means that both ethyl groups are on the same side of the ring. Assign the substituents to positions on adjacent carbons in the chair conformation, ensuring they are both either axial or equatorial to maintain the cis relationship.
Step 3: Draw the first chair conformer. Place one ethyl group in the axial position on carbon 1 and the other ethyl group in the axial position on carbon 2. Ensure the cis relationship is preserved by keeping both substituents on the same side of the ring.
Step 4: Draw the second chair conformer by performing a ring flip. In this conformer, the ethyl group on carbon 1 will move to the equatorial position, and the ethyl group on carbon 2 will also move to the equatorial position. Again, ensure the cis relationship is maintained.
Step 5: Compare the stability of the two conformers. Substituents in the equatorial position experience less steric hindrance compared to axial positions. Therefore, the conformer with both ethyl groups in equatorial positions is more stable due to reduced 1,3-diaxial interactions.
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Chair Conformation
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 analyzing the stability of cyclohexane derivatives, as different substituents can occupy axial or equatorial positions, affecting overall stability.
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03:29
Understanding what a conformer is.
Cis and Trans Isomerism
Cis and trans isomerism refers to the spatial arrangement of substituents around a cyclohexane ring. In cis isomers, substituents are on the same side of the ring, while in trans isomers, they are on opposite sides. This arrangement significantly influences the steric interactions between substituents, which in turn affects the stability of the conformers. For cis-1,2-diethylcyclohexane, both ethyl groups will be on the same side, impacting their positioning in the chair conformations.
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00:44Is the following cyclohexane cis or trans?
Stability of Conformers
The stability of chair conformers is determined by the positioning of substituents in axial or equatorial orientations. Equatorial positions are generally more stable due to reduced steric hindrance and torsional strain compared to axial positions, where substituents can experience 1,3-diaxial interactions. When analyzing the stability of cis-1,2-diethylcyclohexane, it is essential to compare the steric effects of the ethyl groups in both chair conformers to determine which is more stable.
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03:29Understanding what a conformer is.
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