Textbook Question
How many sets of equivalent hydrogens are present in the molecule that resulted in this NMR spectrum? [Recall that some signals can be split into multiple peaks—they are still just one signal.]
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Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases: Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
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Mullins 1st EditionCh. 15 - Structural Identification II: Nuclear Magnetic Resonance SpectroscopyProblem 18
Mullins 1st EditionCh. 15 - Structural Identification II: Nuclear Magnetic Resonance SpectroscopyProblem 18Chapter 14, Problem 18
Without worrying about the relative location of the signals (i.e., the chemical shift) or the splitting patterns, draw a spectrum of the following molecule. Be sure to label each signal based on the set of equivalent hydrogens to which it corresponds.
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Identify all the unique sets of equivalent hydrogens in the molecule. Equivalent hydrogens are those that are in the same chemical environment and will produce the same NMR signal.
Count the number of hydrogens in each set of equivalent hydrogens. This will help determine the relative intensity of each signal in the spectrum.
Draw a baseline for the NMR spectrum. This is a horizontal line where you will place the signals.
For each set of equivalent hydrogens, draw a vertical line above the baseline to represent the signal. The height of the line should be proportional to the number of hydrogens in that set.
Label each signal with the corresponding set of equivalent hydrogens. This helps in identifying which part of the molecule each signal represents.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Equivalent Hydrogens
Equivalent hydrogens are atoms in a molecule that are in identical chemical environments, leading them to produce the same signal in an NMR spectrum. Identifying these hydrogens is crucial for predicting the number of signals in a spectrum, as each set of equivalent hydrogens corresponds to one distinct signal.
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General properties of catalytic hydrogenation.
NMR Spectroscopy
Nuclear Magnetic Resonance (NMR) Spectroscopy is a technique used to determine the structure of organic compounds by observing the behavior of nuclei in a magnetic field. It provides information about the number of hydrogen environments in a molecule, which is essential for drawing and interpreting NMR spectra.
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Chemical Shift
Chemical shift refers to the position of an NMR signal, which indicates the electronic environment of the nuclei. Although the question specifies not to worry about chemical shifts, understanding that they reflect the electronic surroundings of hydrogens helps in labeling signals based on equivalent hydrogens in more advanced analyses.
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Related Practice
Textbook Question
For the molecules shown, give the number of signals expected and the relative ratio of the signal integrations.
(b)
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Textbook Question
(a) Calculate the resonance frequency of an aldehydic proton ( δ 9.3 ppm) if it is detected on a 60-MHz NMR spectrometer.
(b) What if it were detected on a 300-MHz instrument?
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Textbook Question
If rotation is restricted, as in the case of the molecule shown, the hydrogens labeled a and b are nonequivalent. Why?
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Textbook Question
How many unique ¹H NMR signals would you expect in an NMR spectrum for the following molecules?
(c)
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Textbook Question
Without worrying about the relative location of the signals (i.e., the chemical shift) or the splitting patterns, draw a spectrum of the following molecule, being sure to indicate the integration of each peak. Label each signal based on the set of equivalent hydrogens to which it corresponds. [We expand on this question in future assessments.]
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