Textbook Question
Show how you would accomplish the following multistep syntheses. You may use any additional reagents and solvents you need.
(d)
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Ch. 20 - Carboxylic Acids
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 20, Problem 39f
Show how you would accomplish the following multistep syntheses. You may use any additional reagents and solvents you need.
(f) 
Verified step by step guidance1
Step 1: Begin with the starting material, cyclohexanecarboxylic acid. Convert the carboxylic acid group (-COOH) into an acyl chloride (-COCl) using thionyl chloride (SOCl₂). This reaction replaces the hydroxyl group (-OH) with a chlorine atom, making the compound more reactive for subsequent steps.
Step 2: Prepare the alcohol nucleophile, cyclohexanol, which will be used to form the ester bond. Ensure the alcohol is pure and ready for the esterification reaction.
Step 3: React the acyl chloride (from Step 1) with cyclohexanol in the presence of a base such as pyridine or triethylamine. The base neutralizes the HCl byproduct formed during the reaction, facilitating the formation of the ester bond.
Step 4: Allow the reaction to proceed under controlled conditions (e.g., room temperature or slightly elevated temperature) to ensure complete conversion of the acyl chloride and alcohol into the ester product.
Step 5: Purify the final product, cyclohexyl cyclohexanecarboxylate, using techniques such as distillation or recrystallization to remove any unreacted starting materials or impurities.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Fischer Esterification
Fischer esterification is a chemical reaction that forms an ester from a carboxylic acid and an alcohol in the presence of an acid catalyst. This reaction is reversible and typically requires heating to drive the equilibrium towards ester formation. The reaction mechanism involves the protonation of the carboxylic acid, followed by nucleophilic attack by the alcohol, leading to the formation of the ester and water.
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Reagents and Solvents
In organic synthesis, the choice of reagents and solvents is crucial for the success of a reaction. Reagents are the substances that undergo chemical changes, while solvents are the mediums in which reactions occur. For Fischer esterification, common reagents include a carboxylic acid, an alcohol, and a strong acid catalyst like sulfuric acid. The solvent can influence the reaction rate and product yield, often chosen to dissolve the reactants effectively.
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Reaction Mechanism
Understanding the reaction mechanism is essential for predicting the outcome of a chemical reaction. In the case of Fischer esterification, the mechanism involves several steps: protonation of the carboxylic acid, nucleophilic attack by the alcohol, formation of a tetrahedral intermediate, and elimination of water to form the ester. A clear grasp of the mechanism helps in optimizing conditions and selecting appropriate reagents for the synthesis.
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Related Practice
Textbook Question
In the presence of a trace of acid, δ-hydroxyvaleric acid forms a cyclic ester (lactone).
(a) Give the structure of the lactone, called δ-valerolactone.
(b) Propose a mechanism for the formation of δ-valerolactone.
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Textbook Question
Show how you would accomplish the following multistep syntheses. You may use any additional reagents and solvents you need.
(e)
704
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Textbook Question
Show how you would accomplish the following multistep syntheses. You may use any additional reagents and solvents you need.
(c)
600
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Textbook Question
The following NMR spectra correspond to compound of formula (C) C6H10O2. Propose structure, and show how it is consistent with the observed absorptions.
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Textbook Question
The following NMR spectra correspond to compound of formula (A) C9H10O2. Propose structure, and show how it is consistent with the observed absorptions.
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