교과서 질문
How can 1,2-, 1,3-, and 1,4-dinitrobenzene be distinguished by
a. 1H NMR spectroscopy?
1316
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Ch. 14 - NMR Spectroscopy
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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TOC.tableOfContents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding31
- 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
14장, 문제 44a
Identify each compound below from its molecular formula and its 13C NMR spectrum.
a. C11H22O
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검증된 단계별 안내1
Step 1: Calculate the degree of unsaturation (also known as the index of hydrogen deficiency, IHD) for the molecular formula C11H22O. Use the formula: IHD = (2C + 2 - H + N - X)/2, where C = number of carbons, H = number of hydrogens, N = number of nitrogens, and X = number of halogens. For C11H22O, there are no nitrogens or halogens, so IHD = (2(11) + 2 - 22)/2 = 0. This indicates the compound is fully saturated with no double bonds, triple bonds, or rings.
Step 2: Analyze the 13C NMR spectrum. Look for the number of distinct carbon signals, which corresponds to the number of unique carbon environments in the molecule. For example, if the spectrum shows 11 signals, it suggests all 11 carbons are in unique environments. Fewer signals would indicate symmetry in the molecule.
Step 3: Consider the presence of the oxygen atom in the molecular formula. The oxygen could be part of a functional group such as an alcohol (-OH), ether (R-O-R), or carbonyl group (C=O). Use the chemical shift values in the 13C NMR spectrum to identify the functional group. For example, carbons attached to an alcohol or ether typically appear in the range of 50-90 ppm, while carbonyl carbons appear in the range of 160-220 ppm.
Step 4: Use the splitting patterns and integration of the 13C NMR signals to deduce the structure. For instance, if the spectrum shows signals for a quaternary carbon (no hydrogens attached), it might indicate a branching point in the molecule. Additionally, the presence of methyl (CH3), methylene (CH2), or methine (CH) groups can be inferred from the chemical shifts and intensities.
Step 5: Propose a structure for the compound that matches the molecular formula (C11H22O), the degree of unsaturation (IHD = 0), and the 13C NMR data. Ensure the structure accounts for all observed signals and is consistent with the chemical shifts and splitting patterns in the spectrum.
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주요 개념
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Molecular Formula Interpretation
The molecular formula provides essential information about the number and types of atoms in a compound. For C11H22O, it indicates there are 11 carbon (C) atoms, 22 hydrogen (H) atoms, and 1 oxygen (O) atom. Understanding how to interpret this formula is crucial for deducing the compound's structure and potential functional groups.
추천 영상:
06:06
How to interpret condensed structures.
13C NMR Spectroscopy
13C NMR (Nuclear Magnetic Resonance) spectroscopy is a powerful analytical technique used to determine the structure of organic compounds. It provides information about the carbon environment in a molecule, including the number of distinct carbon atoms and their chemical surroundings. Analyzing the peaks in the 13C NMR spectrum helps identify the types of carbon present and their connectivity.
추천 영상:
04:0013C NMR General Features
Functional Groups and Isomerism
Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In the case of C11H22O, the presence of an oxygen atom suggests possible functional groups like alcohols or ethers. Understanding isomerism, where compounds with the same molecular formula can have different structures, is also vital for identifying the correct compound.
추천 영상:
02:36Identifying Functional Groups
관련 실천
교과서 질문
What does cross peak X in Figure 14.34 tell you?
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146
views
교과서 질문
How many signals are produced by each of the following compounds in its
a. 1H NMR spectrum?
4.
5.
6.
1011
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교과서 질문
Identify pairs of coupled protons in the compound whose COSY spectrum is shown below.
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106
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교과서 질문
Describe the proton-coupled 13C NMR spectra for compound 1 in Problem 41, indicating the relative positions of the signals.
1. CH3CH2CH2Br
1256
views
교과서 질문
How can 1,2-, 1,3-, and 1,4-dinitrobenzene be distinguished by
b. 13C NMR spectroscopy?
1668
views