Textbook Question
How many signals are produced by each of the following compounds in its
a. 1H NMR spectrum?
4.
5.
6.
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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 77b
Identify each of the following compounds from its molecular formula and its IR and 1H NMR spectra:
b.C6H14O
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Verified step by step guidance1
Step 1: Analyze the molecular formula (C6H14O). The formula indicates the compound contains 6 carbons, 14 hydrogens, and 1 oxygen. Calculate the degree of unsaturation using the formula: \( \text{Degree of Unsaturation} = rac{2C + 2 - H + N - X}{2} \), where \( C \) is the number of carbons, \( H \) is the number of hydrogens, \( N \) is the number of nitrogens, and \( X \) is the number of halogens. For C6H14O, the degree of unsaturation is 0, meaning the compound is fully saturated (no double bonds, triple bonds, or rings).
Step 2: Examine the IR spectrum. Look for characteristic absorption bands that indicate the presence of functional groups. For example, a broad peak around 3200-3600 cm⁻¹ suggests the presence of an -OH group (alcohol). If no such peak is observed, the oxygen might be part of an ether group.
Step 3: Analyze the 1H NMR spectrum. Look for the number of signals, their chemical shifts, splitting patterns, and integration values. For example, a signal around 3.3-4.0 ppm could indicate protons adjacent to an oxygen atom (e.g., in an alcohol or ether). The splitting patterns (singlet, doublet, triplet, etc.) provide information about the number of neighboring hydrogens, and the integration values indicate the relative number of hydrogens contributing to each signal.
Step 4: Combine the information from the IR and 1H NMR spectra. If the IR spectrum shows an -OH group and the NMR spectrum has a singlet corresponding to a hydroxyl proton (around 1-5 ppm), the compound is likely an alcohol. If the IR spectrum lacks an -OH peak and the NMR spectrum shows signals consistent with an ether, the compound is likely an ether.
Step 5: Propose a structure for the compound based on the molecular formula, degree of unsaturation, and spectral data. For example, if the IR spectrum shows an -OH group and the NMR spectrum indicates a simple alcohol structure, the compound could be a hexanol isomer. If the IR spectrum suggests an ether and the NMR spectrum supports this, the compound could be a hexyl ether isomer. Verify the proposed structure by ensuring it matches all spectral data.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Molecular Formula Interpretation
The molecular formula provides essential information about the number and types of atoms in a compound. For C6H14O, it indicates the presence of six carbon atoms, fourteen hydrogen atoms, and one oxygen atom. Understanding how to interpret this formula helps in predicting the possible structures and functional groups present in the compound.
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Infrared (IR) Spectroscopy
IR spectroscopy is a technique used to identify functional groups in a molecule based on the absorption of infrared light. Different bonds absorb characteristic wavelengths, allowing for the identification of functional groups such as alcohols, ethers, and alkanes. Analyzing the IR spectrum of C6H14O will reveal specific peaks that correspond to the O-H stretch of alcohols, aiding in compound identification.
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Proton Nuclear Magnetic Resonance (1H NMR) Spectroscopy
1H NMR spectroscopy provides information about the hydrogen atoms in a molecule, including their environment and connectivity. The chemical shifts, splitting patterns, and integration of peaks in the NMR spectrum can reveal the number of hydrogen atoms in different environments, helping to deduce the structure of C6H14O. This technique is crucial for confirming the identity of the compound based on its unique spectral characteristics.
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Related Practice
Textbook Question
When compound A (C5H12O) is treated with HBr, it forms compound B (C5H11Br). The 1H NMR spectrum of compound A has a 1H singlet, a 3H doublet, a 6H doublet, and two 1H multiplets. The 1H NMR spectrum of compound B has a 6H singlet, a 3H triplet, and a 2H quartet. Identify compounds A and B.
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Textbook Question
The following 1H NMR spectra are for four compounds, each with molecular formula of C6H12O2. Identify the compounds.
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Textbook Question
Identify the compound with molecular formula C6H10O that gives the following DEPT 13C NMR spectrum:
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Textbook Question
How many signals are produced by each of the following compounds in its
b. 13C NMR spectrum?
6.
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Textbook Question
How many signals are produced by each of the following compounds in its
b. 13C NMR spectrum?
5.
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