Textbook Question
Draw a splitting diagram for Hb, where
a. Jba = 12 Hz and Jbc = 6 Hz.
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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 33a(1)
For the following compounds, which pairs of hydrogens (Ha and Hb) are enantiotopic hydrogens?
1. 
Verified step by step guidance1
Step 1: Understand the concept of enantiotopic hydrogens. Enantiotopic hydrogens are pairs of hydrogens in a molecule that, when replaced by a different group, result in two enantiomers. This occurs when the molecule has a plane of symmetry or a chiral center upon substitution.
Step 2: Analyze the structure provided. The molecule is 2-methylbutane, and the hydrogens Ha and Hb are attached to the same carbon atom (the second carbon in the chain). This carbon is bonded to a methyl group, an ethyl group, and another methyl group.
Step 3: Determine if replacing Ha and Hb individually with a different group (e.g., a chlorine atom) would create two enantiomers. To do this, visualize the molecule after substitution and check for chirality. If the resulting molecules are non-superimposable mirror images, Ha and Hb are enantiotopic.
Step 4: Consider the symmetry of the molecule. The carbon atom to which Ha and Hb are attached is not part of a plane of symmetry, and the molecule becomes chiral upon substitution of either hydrogen. This indicates that Ha and Hb are enantiotopic.
Step 5: Conclude that Ha and Hb are enantiotopic hydrogens because their individual replacement leads to the formation of two enantiomers, confirming their relationship.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Enantiotopic Hydrogens
Enantiotopic hydrogens are pairs of hydrogen atoms that, when replaced by a different atom or group, lead to the formation of enantiomers—molecules that are non-superimposable mirror images of each other. This concept is crucial in stereochemistry, as it helps in identifying chiral centers and understanding molecular symmetry.
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The definition of hydrogenation.
Chirality
Chirality refers to the property of a molecule that makes it non-superimposable on its mirror image. A chiral molecule typically has at least one carbon atom bonded to four different substituents, creating two distinct forms (enantiomers). Understanding chirality is essential for recognizing how enantiotopic hydrogens contribute to the overall stereochemistry of a compound.
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Stereoisomerism
Stereoisomerism is a form of isomerism where molecules have the same molecular formula and connectivity of atoms but differ in the spatial arrangement of those atoms. This includes enantiomers and diastereomers, and it is vital for understanding the behavior and reactivity of organic compounds, particularly in the context of enantiotopic hydrogens.
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Related Practice
Textbook Question
Propose structures that are consistent with the following spectra. (Integral ratios are given from left to right across the spectrum.)
b. The 1H NMR spectrum of a compound with molecular formula C6H10O2 has two singlets with integral ratios of 2 : 3.
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Textbook Question
Which pairs are diastereotopic hydrogens?
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Textbook Question
For the following compounds, which pairs of hydrogens (Ha and Hb) are enantiotopic hydrogens?
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Textbook Question
Why is there no coupling between the a and c protons or between the b and c protons in the cis and trans alkenes shown in Figure 14.20?
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Textbook Question
How would the 1H NMR spectra for the four compounds with molecular formula C3H6Br2 differ?
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