Textbook Question
How many signals are produced by each of the following compounds in its
b. 13C NMR spectrum?
4.
1519
views
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 78b(5)
How many signals are produced by each of the following compounds in its
b. 13C NMR spectrum?
5. 
Verified step by step guidance1
Analyze the structure of the compound: The given compound is bromocyclopropane with two methyl groups attached to the cyclopropane ring. The bromine atom is bonded to one of the carbons in the cyclopropane ring.
Determine the symmetry of the molecule: The molecule has a plane of symmetry passing through the bromine atom and the cyclopropane ring. This symmetry will help identify equivalent carbons.
Identify the unique carbon environments: In 13C NMR, each unique carbon environment produces a distinct signal. The cyclopropane ring has three carbons, but due to symmetry, two of them are equivalent. The methyl groups are also equivalent to each other.
Count the number of unique carbon environments: There are three unique carbon environments in this molecule: (1) the carbon bonded to bromine, (2) the two equivalent carbons in the cyclopropane ring, and (3) the two equivalent methyl carbons.
Conclude the number of signals: Based on the analysis, the compound will produce three distinct signals in its 13C 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, such as carbon-13 (13C), to provide information about the environment surrounding these nuclei. In 13C NMR, each unique carbon environment in a molecule produces a distinct signal, allowing chemists to infer structural details.
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General NMR Features
Chemical Shifts
Chemical shifts in NMR spectroscopy refer to the variation in resonance frequency of a nucleus due to its electronic environment. In 13C NMR, the chemical shift is influenced by factors such as electronegativity of nearby atoms and hybridization of the carbon atom. Understanding chemical shifts helps in identifying the types of carbon environments present in a compound, which is crucial for interpreting the NMR spectrum.
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Signal Counting in NMR
The number of signals observed in an NMR spectrum corresponds to the number of distinct carbon environments in a molecule. Equivalent carbons, which are in the same electronic environment, will produce a single signal, while non-equivalent carbons will produce separate signals. Analyzing the structure of the compound allows chemists to predict how many unique signals will appear in the 13C NMR spectrum.
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Related Practice
Textbook Question
How many signals are produced by each of the following compounds in its
a. 1H NMR spectrum?
4.
5.
6.
1235
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Textbook Question
Identify each of the following compounds from its molecular formula and its IR and 1H NMR spectra:
b.C6H14O
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1271
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Textbook Question
How many signals are produced by each of the following compounds in its
b. 13C NMR spectrum?
6.
1282
views