Textbook Question
Give the structures of compounds A through B in the following series of reactions.
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Ch. 17 - Reactions of Aromatic Compounds
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 17, Problem 57c
Give the structures of compounds A through C in the following series of reactions.
Verified step by step guidance1
Step 1: Analyze the first reaction. The starting material is benzene, and it reacts with isobutyryl chloride (CH3CH(CH3)COCl) in the presence of AlCl3. This is a Friedel-Crafts acylation reaction, where the acyl group (CH3CH(CH3)CO-) is introduced onto the benzene ring to form compound A.
Step 2: Understand the mechanism of Friedel-Crafts acylation. AlCl3 acts as a Lewis acid, facilitating the generation of the acylium ion (CH3CH(CH3)C+=O), which is the electrophile. This electrophile reacts with benzene to form the ketone product (compound A).
Step 3: Examine the second reaction. Compound A undergoes a Clemmensen reduction using Zn(Hg) and HCl. This reaction reduces the carbonyl group (C=O) in compound A to a methylene group (-CH2-), resulting in compound C.
Step 4: Understand the Clemmensen reduction mechanism. Zn(Hg) in acidic conditions reduces the ketone functional group to an alkane, effectively removing the oxygen atom and replacing it with two hydrogen atoms.
Step 5: Summarize the transformations. Compound A is formed by the acylation of benzene with isobutyryl chloride, introducing a ketone group. Compound C is formed by reducing the ketone group in compound A to a methylene group via Clemmensen reduction.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Reaction Mechanisms
Understanding reaction mechanisms is crucial in organic chemistry as it describes the step-by-step process by which reactants transform into products. This includes identifying intermediates, transition states, and the types of bonds formed or broken during the reaction. Familiarity with mechanisms helps predict the outcome of reactions and the structures of the resulting compounds.
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Functional Groups
Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. Recognizing functional groups is essential for predicting the behavior of organic compounds during reactions. Each functional group has distinct properties and reactivity patterns, which influence the overall structure of the compounds involved.
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Stereochemistry
Stereochemistry involves the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. It is important for understanding isomerism, where compounds with the same molecular formula can have different structures and properties. Knowledge of stereochemistry is vital when determining the correct structures of products in a series of reactions, especially when chiral centers are involved.
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Related Practice
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The following compound reacts with a hot, concentrated solution of NaOH (in a sealed tube) to give a mixture of two products. Propose structures for these products, and give a mechanism to account for their formation.
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Give the structures of compounds C through D in the following series of reactions.
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Show the products you expect when each compound reacts with NBS with light shining on the reaction.
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What products would you expect from the following coupling reactions?
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Textbook Question
A student added 3-phenylpropanoic acid (PhCH2CH2COOH) to a molten salt consisting of a 1:1 mixture of NaCl and AlCl3 maintained at 170 °C. After 5 minutes, he poured the molten mixture into water and extracted it into dichloromethane. Evaporation of the dichloromethane gave a 96% yield of the product whose spectra follow. The mass spectrum of the product shows a molecular ion at m/z 132. What is the product?
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