Textbook Question
Show how the following compounds can be prepared from benzene:
c.
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Ch. 18 - Reactions of Benzene and Substituted Benzenes
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
Chapter 19, Problem 92a
How can you distinguish the following compounds using: a. their infrared spectra?
Verified step by step guidance1
First, identify the functional groups present in each compound. Compound (A) is a carboxylic acid, compound (B) is an aldehyde, and compound (C) is an ester.
Understand the characteristic IR absorption bands for each functional group. Carboxylic acids typically show a broad O-H stretch around 2500-3000 cm-1> and a C=O stretch near 1700 cm-1>. Aldehydes have a C=O stretch around 1720-1740 cm-1> and may show C-H stretches near 2700-2900 cm-1>. Esters exhibit a C=O stretch around 1735-1750 cm-1> and C-O stretches near 1050-1300 cm-1>.
Examine the IR spectrum for compound (A). Look for the broad O-H stretch and the C=O stretch, which are indicative of a carboxylic acid.
Analyze the IR spectrum for compound (B). Identify the C=O stretch and the C-H stretches that are characteristic of an aldehyde.
Review the IR spectrum for compound (C). Detect the C=O stretch and the C-O stretches, which are typical for an ester.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Infrared Spectroscopy
Infrared spectroscopy is an analytical technique used to identify functional groups in organic compounds by measuring the absorption of infrared light. Different bonds absorb characteristic wavelengths of infrared light, leading to distinct peaks in the spectrum. This allows chemists to determine the presence of specific functional groups, such as alcohols, aldehydes, and esters, based on their unique absorption patterns.
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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. In the context of the compounds shown, the presence of hydroxyl (-OH), aldehyde (-CHO), and ester (-COOR) groups will influence the infrared spectrum. Recognizing these groups is essential for interpreting the spectra and distinguishing between the compounds.
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Characteristic Absorption Peaks
Each functional group has a characteristic absorption peak in the infrared spectrum. For example, alcohols typically show a broad O-H stretch around 3200-3600 cm⁻¹, while carbonyl groups (C=O) appear around 1700 cm⁻¹. By analyzing these peaks, one can differentiate between compounds A, B, and C based on their unique functional groups and the corresponding absorption features in their infrared spectra.
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Related Practice
Textbook Question
Propose a mechanism for the following reaction that explains why the configuration of the asymmetric center in the reactant is retained in the product:
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Textbook Question
Describe how 3-methyl-1-phenyl-3-pentanol can be prepared from benzene. You can use any inorganic reagents and solvents, and any organic reagents provided they contain no more than two carbons.
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Textbook Question
Propose a mechanism for each of the following reactions:
b.
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Textbook Question
When heated with chromic acid, compound A forms benzoic acid. Identify compound A from its 1H NMR spectrum.
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Textbook Question
Propose a mechanism for each of the following reactions:
b.
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