Textbook Question
Suggest the most appropriate reagent for each synthesis, and explain your choice.
(c)
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Ch. 21 - Carboxylic Acid Derivatives
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 21, Problem 34b
Suggest the most appropriate reagent for each synthesis, and explain your choice.
(b) 
Verified step by step guidance1
Step 1: Analyze the transformation. The starting material is salicylic acid (a benzene ring with an -OH group and a -COOH group in ortho positions). The product is methyl salicylate, where the -COOH group has been converted into a methyl ester (-COOCH3). This indicates an esterification reaction.
Step 2: Identify the reagent required for esterification. Esterification typically involves reacting a carboxylic acid (-COOH) with an alcohol (e.g., methanol, CH3OH) in the presence of an acid catalyst, such as concentrated sulfuric acid (H2SO4). The acid catalyst helps protonate the carboxylic acid, making it more reactive.
Step 3: Write the general reaction mechanism. The carboxylic acid (-COOH) reacts with methanol (CH3OH) under acidic conditions. The hydroxyl group (-OH) of the carboxylic acid is replaced by the methoxy group (-OCH3) from methanol, forming the ester (-COOCH3). Water (H2O) is produced as a byproduct.
Step 4: Explain why methanol and sulfuric acid are appropriate choices. Methanol provides the methyl group (-CH3) needed for the ester, while sulfuric acid acts as a catalyst to speed up the reaction and ensure the formation of the ester. This combination is commonly used for esterification reactions.
Step 5: Summarize the synthesis. To convert salicylic acid into methyl salicylate, react salicylic acid with methanol in the presence of concentrated sulfuric acid. Heat the reaction mixture to facilitate the esterification process, and isolate the product after completion.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Reagent Selection
Choosing the right reagent is crucial in organic synthesis as it determines the efficiency and outcome of the reaction. The selected reagent must be compatible with the starting materials and the desired product, taking into account factors such as reactivity, selectivity, and functional group compatibility.
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Reagents
Reaction Mechanisms
Understanding the underlying reaction mechanisms is essential for predicting how reagents will interact with substrates. This includes knowledge of nucleophiles, electrophiles, and the types of reactions (e.g., substitution, addition, elimination) that can occur, which helps in rationalizing the choice of reagents.
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Functional Group Transformations
Functional groups dictate the chemical behavior of organic molecules. Recognizing the functional groups present in the reactants and the desired product allows chemists to select reagents that can effectively transform one functional group into another, facilitating the synthesis of complex molecules.
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Related Practice
Textbook Question
Show how you would synthesize each compound, starting with an ester containing no more than eight carbon atoms. Any other necessary reagents may be used.
(a) Ph3C–OH
(b) (PhCH2)2CHOH
(c) PhCONHCH2CH3
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Textbook Question
Show how you would use anhydrides to synthesize the following compounds. In each case, explain why an anhydride might be preferable to an acid chloride.
(c) phthalic acid monoamide
(d) succinic acid monomethyl ester
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Textbook Question
Suggest the most appropriate reagent for each synthesis, and explain your choice.
(d)
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Textbook Question
Show how you would use anhydrides to synthesize the following compounds. In each case, explain why an anhydride might be preferable to an acid chloride.
(a) n-octyl formate
(b) n-octyl acetate
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Textbook Question
Suggest the most appropriate reagent for each synthesis, and explain your choice.
(a)
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