Textbook Question
How many signals are produced by each of the following compounds in its
b. 13C NMR spectrum?
2.
1377
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Ch. 14 - NMR Spectroscopy
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 15, Problem 47a(4,5,6)
How many signals are produced by each of the following compounds in its
a. 1H NMR spectrum?
4. 
5. 
6. 
Verified step by step guidance1
Step 1: Analyze the structure of the compound provided. The image shows a five-membered ring containing a sulfur atom. This compound is thiophene, an aromatic heterocyclic compound.
Step 2: Determine the symmetry of the molecule. Thiophene is symmetric due to the sulfur atom and the alternating double bonds in the ring, which make it aromatic.
Step 3: Identify the unique hydrogen environments. In thiophene, there are two types of hydrogens: those on the carbons adjacent to the sulfur atom (α-hydrogens) and those on the carbons opposite the sulfur atom (β-hydrogens).
Step 4: Count the number of unique signals in the 1H NMR spectrum. The α-hydrogens are equivalent to each other, and the β-hydrogens are equivalent to each other, resulting in two distinct signals.
Step 5: Consider the splitting patterns. The α-hydrogens will couple with the β-hydrogens, and vice versa, leading to splitting patterns that can be analyzed further in the NMR spectrum.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nuclear Magnetic Resonance (NMR) Spectroscopy
NMR spectroscopy is a powerful analytical technique used to determine the structure of organic compounds. It relies on the magnetic properties of certain nuclei, primarily hydrogen (1H), to provide information about the number of different hydrogen environments in a molecule. Each unique hydrogen environment produces a distinct signal in the NMR spectrum, allowing chemists to infer structural details.
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General NMR Features
Chemical Shifts
Chemical shifts in NMR spectroscopy refer to the resonance frequency of a nucleus relative to a standard reference frequency. They are influenced by the electronic environment surrounding the hydrogen atoms, which can be affected by factors such as electronegativity of nearby atoms and hybridization. Understanding chemical shifts is crucial for interpreting the NMR spectrum and identifying the types of hydrogen present in a compound.
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11:441H NMR Chemical Shifts
Signal Splitting and Integration
In NMR, signal splitting occurs due to the interaction of neighboring hydrogen atoms, leading to multiplet patterns that provide information about the number of adjacent protons. Integration of the NMR signals quantifies the area under each peak, which correlates to the number of protons contributing to that signal. This information helps in deducing the molecular structure and the relative number of hydrogen atoms in different environments.
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Related Practice
Textbook Question
What does cross peak X in Figure 14.34 tell you?
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Textbook Question
Identify each compound below from its molecular formula and its 13C NMR spectrum.
a. C11H22O
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Textbook Question
Label each set of chemically equivalent protons, using a for the set that will be at the lowest frequency in the 1H NMR spectrum, b for the next lowest, and so on. Indicate the multiplicity of each signal.
a.
1552
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Textbook Question
How many signals are produced by each of the following compounds in its
b. 13C NMR spectrum?
1.
1249
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Textbook Question
Identify pairs of coupled protons in the compound whose COSY spectrum is shown below.
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106
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