Textbook Question
Draw the 13C NMR spectrum you would expect to see for each of the molecules shown.
(b)
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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 69
Mullins 1st EditionCh. 15 - Structural Identification II: Nuclear Magnetic Resonance SpectroscopyProblem 69Chapter 14, Problem 69
Assign the peaks in the ¹H NMR spectrum for the molecule shown.
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Identify the different types of hydrogen environments in the molecule. Look for unique hydrogen atoms that are in different chemical environments due to their bonding and the presence of nearby electronegative atoms or π systems.
Determine the chemical shift range for each type of hydrogen. Use known chemical shift ranges for different types of hydrogens, such as alkyl, alkenyl, aromatic, or those near electronegative atoms.
Consider the splitting pattern for each peak. The splitting pattern is determined by the number of neighboring hydrogens (n+1 rule), where n is the number of adjacent hydrogens.
Estimate the integration of each peak. The integration corresponds to the relative number of hydrogens contributing to each signal, which helps in assigning the peaks to specific hydrogen environments.
Match each peak in the ¹H NMR spectrum with the identified hydrogen environments based on chemical shift, splitting pattern, and integration. Assign the peaks accordingly to complete the analysis.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
¹H NMR Spectroscopy
¹H NMR spectroscopy is a technique used to determine the structure of organic compounds by analyzing the magnetic environment of hydrogen atoms. It provides information about the number of hydrogen atoms, their chemical environment, and how they are connected within a molecule. Peaks in the spectrum correspond to different hydrogen environments, helping to deduce molecular structure.
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General NMR Features
Chemical Shift
Chemical shift in ¹H NMR refers to the position of the NMR signal relative to a standard reference, typically tetramethylsilane (TMS). It indicates the electronic environment surrounding a hydrogen atom, influenced by nearby electronegative atoms or functional groups. Chemical shifts help identify the type of hydrogen present, such as aromatic, aliphatic, or hydroxyl hydrogens.
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Spin-Spin Coupling
Spin-spin coupling, or J-coupling, occurs when hydrogen atoms influence each other's magnetic fields, causing splitting of NMR signals into multiplets. The pattern and number of peaks in a multiplet provide information about the number of neighboring hydrogen atoms. Understanding coupling helps in determining the connectivity and arrangement of atoms within a molecule.
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Related Practice
Textbook Question
In the lab, ¹H NMR is often used to verify that a reaction has worked as expected by comparing the product spectrum with what is expected. Given the ¹H NMR of the reactant shown, draw the spectrum you'd expect to see of the product that results.
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Textbook Question
Draw the ¹³C NMR spectrum you would expect to see for each of the molecules shown.
(a)
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Textbook Question
A graduate student ran a reaction that produced a mixture of the following two compounds. After painstaking purification, she is able to separate the two compounds. Using ¹H NMR, how can she determine which diastereomer is in which separated sample?
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Textbook Question
For the compound shown, produce a table of the shift, integration, and multiplicity of each peak you would expect to see in a ¹H NMR spectrum.
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Textbook Question
Draw the 13C NMR spectrum you would expect to see for each of the molecules shown.
(c)
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