Textbook Question
Develop syntheses for the following compounds. As starting materials, you may use cyclopentanol, alcohols containing no more than four carbon atoms, and any common reagents and solvents.
(d)
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Ch.11 - Reactions of Alcohols
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Chapter 11, Problem 38b
Develop syntheses for the following compounds. As starting materials, you may use cyclopentanol, alcohols containing no more than four carbon atoms, and any common reagents and solvents.
(b) 1-chloro-1-ethylcyclopentane
Verified step by step guidance1
Step 1: Begin with cyclopentanol as the starting material. Convert cyclopentanol to cyclopentyl bromide using phosphorus tribromide (PBr₃) as the reagent. This reaction replaces the hydroxyl group (-OH) with a bromine atom (-Br).
Step 2: Perform a Grignard reaction to introduce the ethyl group. React cyclopentyl bromide with magnesium (Mg) in dry ether to form cyclopentyl magnesium bromide, a Grignard reagent.
Step 3: React the Grignard reagent (cyclopentyl magnesium bromide) with ethyl bromide (CH₃CH₂Br). This reaction will couple the ethyl group to the cyclopentyl structure, forming 1-ethylcyclopentane.
Step 4: Introduce the chlorine atom at the 1-position. React 1-ethylcyclopentane with chlorine gas (Cl₂) in the presence of UV light or heat. This will result in a free radical halogenation, selectively forming 1-chloro-1-ethylcyclopentane.
Step 5: Purify the product using standard organic purification techniques, such as distillation or recrystallization, to isolate 1-chloro-1-ethylcyclopentane.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleophilic Substitution
Nucleophilic substitution is a fundamental reaction in organic chemistry where a nucleophile attacks an electrophile, resulting in the replacement of a leaving group. In the context of synthesizing 1-chloro-1-ethylcyclopentane, understanding how nucleophiles can displace halides is crucial. This concept is essential for designing pathways that involve the formation of carbon-carbon bonds and the introduction of functional groups.
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Reactivity of Alcohols
Alcohols are versatile compounds that can undergo various reactions, including dehydration, oxidation, and substitution. In this synthesis, alcohols with four or fewer carbon atoms can be converted into alkyl halides through reactions with reagents like thionyl chloride or phosphorus tribromide. Recognizing the reactivity of alcohols is vital for selecting appropriate starting materials and reagents to achieve the desired product.
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Cyclopentane Derivatives
Cyclopentane derivatives are cyclic compounds that can undergo various transformations to introduce substituents or functional groups. In synthesizing 1-chloro-1-ethylcyclopentane, understanding the structure and reactivity of cyclopentane is important for planning the synthesis. This includes knowing how to manipulate the ring structure and utilize reagents that can effectively add or modify substituents on the cyclopentane framework.
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Related Practice
Textbook Question
To practice working through the early parts of a multistep synthesis, devise syntheses of
(b) 3-ethylpentan-2-one from compounds containing no more than three carbon atoms.
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Textbook Question
To practice working through the early parts of a multistep synthesis, devise syntheses of
(a) pentan-3-one from alcohols containing no more than three carbon atoms.
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Textbook Question
Develop syntheses for the following compounds. As starting materials, you may use cyclopentanol, alcohols containing no more than four carbon atoms, and any common reagents and solvents.
(c)
1
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Textbook Question
Develop syntheses for the following compounds. As starting materials, you may use cyclopentanol, alcohols containing no more than four carbon atoms, and any common reagents and solvents.
(e)
1
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Textbook Question
Develop syntheses for the following compounds. As starting materials, you may use cyclopentanol, alcohols containing no more than four carbon atoms, and any common reagents and solvents.
(a) trans-cyclopentane-1,2-diol
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