Textbook Question
How can the following compounds be prepared from the given starting materials?
c.
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Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives
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
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Bruice 8th EditionCh. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblem 83
Bruice 8th EditionCh. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblem 83Chapter 17, Problem 83
A compound gives the following IR spectrum. Upon reaction with sodium borohydride followed by acidification, it forms the product with the 1H NMR spectrum shown below. Identify the starting material and the product.
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Analyze the IR spectrum to identify key functional groups. Look for characteristic absorption bands, such as a strong peak around 1700 cm⁻¹ (indicative of a carbonyl group) or a broad peak around 3200-3600 cm⁻¹ (indicative of an -OH group).
Determine the type of reaction occurring with sodium borohydride (NaBH₄). Sodium borohydride is a reducing agent that typically reduces aldehydes and ketones to their corresponding alcohols. This suggests the starting material likely contains a carbonyl group.
Examine the 1H NMR spectrum of the product. Look for signals that indicate the presence of alcohol protons (e.g., a singlet around 1-5 ppm for an -OH group) and other characteristic proton environments. Compare these signals to the expected product of the reduction reaction.
Propose the structure of the starting material based on the IR spectrum and the reaction mechanism. If the IR spectrum shows a strong carbonyl peak (e.g., around 1700 cm⁻¹), the starting material is likely an aldehyde or ketone.
Propose the structure of the product based on the 1H NMR spectrum and the reaction mechanism. The product should correspond to the alcohol formed by the reduction of the starting material's carbonyl group.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Infrared (IR) Spectroscopy
IR spectroscopy is a technique used to identify functional groups in organic compounds by measuring the absorption of infrared light. Different bonds absorb characteristic wavelengths, allowing chemists to deduce the presence of specific functional groups, such as alcohols, carbonyls, or amines, based on the peaks observed in the spectrum.
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General Features of IR Spect
Sodium Borohydride Reduction
Sodium borohydride (NaBH4) is a reducing agent commonly used to convert carbonyl compounds, such as aldehydes and ketones, into their corresponding alcohols. This reaction typically involves the nucleophilic attack of the hydride ion on the carbonyl carbon, leading to the formation of an alcohol after subsequent acidification, which can be crucial for identifying the product in the given question.
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Proton Nuclear Magnetic Resonance (1H NMR) Spectroscopy
1H NMR spectroscopy is a powerful analytical technique used to determine the structure of organic compounds by analyzing the magnetic environment of hydrogen atoms. The chemical shifts, splitting patterns, and integration of peaks in the NMR spectrum provide insights into the number of hydrogen atoms, their connectivity, and the presence of functional groups, aiding in the identification of both the starting material and the product.
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Related Practice
Textbook Question
Propose a mechanism to explain how dimethyl sulfoxide and oxalyl chloride react to form the dimethylchlorosulfonium ion used as the oxidizing agent in the Swern oxidation.
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Textbook Question
How can the following compounds be prepared from the given starting materials?
a.
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Textbook Question
a. Propose a mechanism for the following reaction:
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Textbook Question
How can the following compounds be prepared from the given starting materials?
b.
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Textbook Question
Unlike a phosphonium ylide that reacts with an aldehyde or a ketone to form an alkene, a sulfonium ylide reacts with an aldehyde or a ketone to form an epoxide. Explain why one ylide forms an alkene, whereas the other forms an epoxide.
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