Textbook Question
Propose mechanisms for the following reactions. In most cases, more products are formed than are shown here. You only need to explain the formation of the products shown, however.
(b)
1
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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 56a,b,c
Show how you would synthesize the following compounds. As starting materials, you may use any alcohols containing four or fewer carbon atoms, cyclohexanol, and any necessary solvents and inorganic reagents.
(a) 
(b) 
(c) 
Verified step by step guidance1
Step 1: For compound (a), start with cyclohexanol as the base alcohol. Perform a Williamson ether synthesis by reacting cyclohexanol with an alkyl halide (e.g., 2-bromopropane) in the presence of a strong base like NaH or KOH. This will form the ether bond between cyclohexanol and the alkyl group.
Step 2: For compound (b), begin with cyclohexanol and oxidize it to cyclohexanone using an oxidizing agent such as PCC (Pyridinium Chlorochromate) or Jones reagent (CrO3/H2SO4). This converts the alcohol group into a ketone group.
Step 3: For compound (c), start with cyclohexanol and perform a Grignard reaction. First, prepare the Grignard reagent by reacting an alkyl halide (e.g., ethyl bromide) with magnesium in dry ether. Then, react the Grignard reagent with cyclohexanone to form the tertiary alcohol intermediate.
Step 4: To complete compound (c), methylate the tertiary alcohol using a methylating agent such as dimethyl sulfate or methyl iodide in the presence of a base like NaOH. This introduces the methoxy group (-OCH3) to the molecule.
Step 5: Ensure proper purification and isolation of the synthesized compounds using techniques like distillation or recrystallization, depending on the physical properties of the final products.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alcohols and Their Reactivity
Alcohols are organic compounds containing one or more hydroxyl (-OH) groups. Their reactivity is influenced by the structure of the alcohol, including the number of carbon atoms and the presence of functional groups. Understanding how alcohols can undergo reactions such as dehydration, oxidation, or substitution is crucial for synthesizing various organic compounds.
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How to name alcohols
Synthesis of Ethers
Ethers are compounds characterized by an oxygen atom connected to two alkyl or aryl groups. They can be synthesized through the dehydration of alcohols, where two alcohol molecules react to form an ether and water. Familiarity with the mechanisms of ether formation, including the use of acid catalysts, is essential for successfully synthesizing ethers from the provided starting materials.
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Cyclohexanol and Its Derivatives
Cyclohexanol is a six-carbon cyclic alcohol that can be transformed into various derivatives through reactions such as oxidation, dehydration, or substitution. Understanding the reactivity of cyclohexanol, including how it can be converted into ketones or ethers, is important for planning synthetic routes to the target compounds shown in the question.
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Related Practice
Textbook Question
Show how you would synthesize the following compounds. As starting materials, you may use any alcohols containing four or fewer carbon atoms, cyclohexanol, and any necessary solvents and inorganic reagents.
(h)
5
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Textbook Question
Show how you would synthesize the following compound. As starting materials, you may use any alcohols containing five or fewer carbon atoms and any necessary solvents and inorganic reagents.
4
views
Textbook Question
Propose mechanisms for the following reactions. In most cases, more products are formed than are shown here. You only need to explain the formation of the products shown, however.
(c)
7
views
Textbook Question
Show how you would synthesize the following compounds. As starting materials, you may use any alcohols containing four or fewer carbon atoms, cyclohexanol, and any necessary solvents and inorganic reagents.
(g)
1
views
Textbook Question
Propose mechanisms for the following reactions. In most cases, more products are formed than are shown here. You only need to explain the formation of the products shown, however.
(a)
3
views