Textbook Question
The following reaction takes place several times faster than the reaction of 2-chlorobutane with HO-:
b. Explain why the OH group in the product is not bonded to the carbon that was bonded to the Cl group in the reactant.
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Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds
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. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblem 85b,c
Bruice 8th EditionCh. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblem 85b,cChapter 11, Problem 85b,c
b. A small amount of a product containing a six-membered ring is also formed. Draw the structure of that product.
c. Why is so little six-membered ring product formed?
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Analyze the reaction conditions and the starting materials to determine the possible products. Consider the mechanism of the reaction and how it might lead to the formation of a six-membered ring product.
Draw the structure of the six-membered ring product. This typically involves identifying how the starting materials can rearrange or cyclize to form a six-membered ring. Use curved arrows to show the electron flow leading to the formation of the product.
Explain why the six-membered ring product is formed in small amounts. Consider factors such as steric hindrance, ring strain, or the stability of the transition state leading to the six-membered ring compared to other products.
Discuss the kinetic and thermodynamic factors that influence the formation of the six-membered ring. For example, if the reaction is under kinetic control, the product formed faster (likely a smaller ring) will dominate, whereas under thermodynamic control, the more stable product (possibly the six-membered ring) might form in higher amounts.
Conclude by summarizing why the six-membered ring product is a minor product, emphasizing the interplay of reaction conditions, stability, and reaction pathway preferences.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cyclization in Organic Chemistry
Cyclization refers to the process where linear or branched chain molecules form cyclic structures. In organic chemistry, this often involves the formation of rings through the reaction of functional groups, such as alcohols or amines, with electrophiles. The stability and strain of the resulting ring can significantly influence the reaction pathway and product distribution.
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Ring Strain
Ring strain occurs in cyclic compounds when the bond angles deviate from the ideal values, leading to increased energy and instability. In six-membered rings, such as cyclohexane, the bond angles are close to the ideal tetrahedral angle of 109.5 degrees, minimizing strain. However, if the formation of a six-membered ring involves unfavorable steric interactions or torsional strain, it may result in lower yields of that product.
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Reaction Mechanisms
Understanding reaction mechanisms is crucial for predicting the products of organic reactions. Mechanisms describe the step-by-step process of how reactants transform into products, including the formation and breaking of bonds. In the context of cyclization, the mechanism can reveal why certain products, like the six-membered ring, are formed in smaller amounts due to competing pathways or intermediates that favor alternative products.
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Related Practice
Textbook Question
The following reaction takes place several times faster than the reaction of 2-chlorobutane with HO-:
a. Explain the enhanced reaction rate.
1
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Textbook Question
Propose a mechanism for the following reaction:
Textbook Question
Propose a mechanism for each of the following reactions:
b.
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Textbook Question
a. Propose a mechanism for the following reaction:
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Textbook Question
Triethylene glycol is one of the products obtained from the reaction of excess ethylene oxide and hydroxide ion. Propose a mechanism for its formation.
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