Textbook Question
Show how you would accomplish the following multistep syntheses, using the indicated starting material and any necessary reagents.
(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 57d
Show how you would accomplish the following multistep syntheses, using the indicated starting material and any necessary reagents.
(d) 
Verified step by step guidance1
Step 1: Protect the phenolic hydroxyl groups of gallic acid by methylation. Use a methylating agent such as dimethyl sulfate or methyl iodide in the presence of a base like potassium carbonate to convert the hydroxyl groups into methoxy groups. This will yield trimethoxybenzoic acid.
Step 2: Reduce the carboxylic acid group of trimethoxybenzoic acid to an aldehyde. This can be accomplished using a reagent like diisobutylaluminum hydride (DIBAL-H) under controlled conditions to selectively reduce the carboxylic acid to an aldehyde, forming trimethoxybenzaldehyde.
Step 3: Perform a reductive amination reaction to introduce the ethylamine group. React trimethoxybenzaldehyde with ethylamine in the presence of a reducing agent such as sodium cyanoborohydride (NaBH3CN) or hydrogen gas with a catalyst like palladium on carbon (Pd/C). This will yield mescaline.
Step 4: Purify the product using techniques such as recrystallization or chromatography to isolate mescaline from any side products or unreacted starting materials.
Step 5: Confirm the structure of mescaline using spectroscopic methods such as NMR (nuclear magnetic resonance) and IR (infrared spectroscopy) to ensure the synthesis was successful.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Multistep Synthesis
Multistep synthesis involves a series of chemical reactions that transform a starting material into a desired product through intermediate compounds. Each step typically requires specific reagents and conditions, and understanding the reactivity of functional groups is crucial for planning the sequence of reactions effectively.
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Multistep Synthesis
Reagents and Reaction Conditions
Reagents are substances used to bring about a chemical reaction, while reaction conditions include temperature, pressure, and solvent choice. Selecting the appropriate reagents and optimizing conditions are essential for achieving high yields and desired selectivity in each step of the synthesis.
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Functional Group Transformation
Functional group transformation refers to the process of converting one functional group into another during a chemical reaction. This concept is vital in organic synthesis, as it allows chemists to modify the structure and properties of molecules, facilitating the construction of complex organic compounds from simpler precursors.
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Related Practice
Textbook Question
In each part, rank the compounds in order of increasing rate of nucleophilic attack at C=O by a strong nucleophile like methoxide.
(a)
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Textbook Question
Methyl p-nitrobenzoate has been found to undergo saponification faster than methyl benzoate.
(b) Would you expect methyl p-methoxybenzoate to undergo saponification faster or slower than methyl benzoate?
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Textbook Question
Show how you would accomplish the following multistep syntheses, using the indicated starting material and any necessary reagents.
(a) hept-6-en-1-ol → ε-caprolactone
(b) methoxybenzene → p-methoxybenzamide
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Textbook Question
Methyl p-nitrobenzoate has been found to undergo saponification faster than methyl benzoate.
(a) Consider the mechanism of saponification, and explain the reasons for this rate enhancement.
Textbook Question
One mole of acetyl chloride is added to a liter of triethylamine, resulting in a vigorous exothermic reaction. Once the reaction mixture has cooled, 1 mole of ethanol is added. Another vigorous exothermic reaction results. The mixture is analyzed and found to contain triethylamine, ethyl acetate, and triethylammonium chloride. Propose mechanisms for the two exothermic reactions.
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