Textbook Question
Draw a diagram like the one shown in Figure 14.12 to predict
b. the relative intensities of the peaks in a quintet.
<IMAGE>
1127
views
Ch. 14 - NMR Spectroscopy
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
Not the one you use?Change textbookSelect a different textbook
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 23c
Indicate the number of signals and the multiplicity of each signal in the 1H NMR spectrum of each of the following compounds:
c. ClCH2CH2CH2Cl
Verified step by step guidance1
Analyze the structure of the compound ClCH₂CH₂CH₂Cl. It consists of a three-carbon chain with chlorine atoms attached to the terminal carbons. This is a symmetrical molecule.
Determine the number of unique hydrogen environments. The terminal CH₂ groups (ClCH₂-) are equivalent due to symmetry, and the central CH₂ group (-CH₂-) is distinct. Thus, there are two unique hydrogen environments.
For the terminal CH₂ groups (ClCH₂-), consider the splitting pattern. Each hydrogen in this group is coupled to the two hydrogens on the adjacent central CH₂ group. This results in a triplet (n+1 rule, where n = 2).
For the central CH₂ group (-CH₂-), consider the splitting pattern. Each hydrogen in this group is coupled to the two hydrogens on one terminal CH₂ group and the two hydrogens on the other terminal CH₂ group. This results in a quintet (n+1 rule, where n = 4).
Summarize the 1H NMR spectrum: There are two signals. The terminal CH₂ groups produce a triplet, and the central CH₂ group produces a quintet.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
1mWas this helpful?
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 hydrogen atoms in different environments within a molecule. The resulting spectrum displays signals that correspond to these environments, allowing chemists to infer structural details.
Recommended video:
Guided course
10:06
General NMR Features
Chemical Shift
Chemical shift refers to the position of a signal in an NMR spectrum, which is influenced by the electronic environment surrounding the hydrogen atoms. Different functional groups and molecular structures can cause shifts in the resonance frequency of protons, leading to distinct signals. Understanding chemical shifts helps in identifying the types of hydrogen environments present in a compound.
Recommended video:
Guided course
11:441H NMR Chemical Shifts
Multiplicity
Multiplicity in NMR refers to the splitting of a signal into multiple peaks, which occurs due to spin-spin coupling between neighboring hydrogen atoms. The number of peaks is determined by the n+1 rule, where n is the number of adjacent protons. This information provides insight into the number of neighboring hydrogens and helps in elucidating the connectivity and arrangement of atoms in the molecule.
Recommended video:
1:41Primary Structure of Nucleic Acids Concept 1
Related Practice
Textbook Question
Explain the relative chemical shifts of the benzene ring protons in Figure 14.18.
<IMAGE>
1568
views
Textbook Question
Draw a diagram like the one shown in Figure 14.12 to predict
a. the relative intensities of the peaks in a triplet.
<IMAGE>
869
views
Textbook Question
Indicate the number of signals and the multiplicity of each signal in the 1H NMR spectrum of each of the following compounds:
a. CH3CH2CH2CH2CH2CH3
1748
views
Textbook Question
Predict the splitting patterns for the signals given by the compounds in Problem 4.
c. CH2=CCl2
1318
views
Textbook Question
Identify each compound from its molecular formula and its 1H NMR spectrum:
b. C5H10O
<IMAGE>
1361
views