Domanda del libro di testo
Propose a mechanism for the following reaction:
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Ch. 12 - Radicals
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
Capitolo 12, Problema 50
Explain why the rate of bromination of methane decreases if HBr is added to the reaction mixture.
Guida verificata passo dopo passo1
Identify the reaction mechanism for the bromination of methane, which is a free radical chain reaction involving initiation, propagation, and termination steps.
Understand that the initiation step involves the homolytic cleavage of Br2 to form two bromine radicals, which is crucial for the propagation of the chain reaction.
Recognize that the addition of HBr introduces additional bromine atoms in a non-radical form, which can react with the bromine radicals, effectively reducing their concentration.
Consider how the presence of HBr can lead to a termination step where bromine radicals react with HBr to form non-radical products, thus decreasing the number of radicals available for the propagation steps.
Conclude that the decrease in the concentration of bromine radicals due to the presence of HBr slows down the overall rate of the bromination reaction, as fewer radicals are available to sustain the chain reaction.
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Bromination Mechanism
Bromination of methane typically occurs via a free radical mechanism, where bromine radicals (Br·) abstract hydrogen atoms from methane (CH4) to form bromomethane (CH3Br). This process involves initiation, propagation, and termination steps, with the rate of reaction heavily dependent on the concentration of bromine radicals in the mixture.
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00:54
Mechanism of Allylic Bromination.
Effect of HBr on Radical Concentration
The addition of HBr introduces bromide ions (Br-) into the reaction mixture, which can react with bromine radicals to form HBr and regenerate bromine. This reaction effectively reduces the concentration of free bromine radicals available for the bromination of methane, thereby decreasing the overall rate of the bromination process.
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03:43The radical stability trend.
Le Chatelier's Principle
Le Chatelier's Principle states that if a dynamic equilibrium is disturbed by changing the conditions, the system shifts to counteract the change. In this case, the addition of HBr shifts the equilibrium of the bromination reaction, favoring the formation of HBr over the production of bromine radicals, thus slowing down the rate of bromination.
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04:12The Electron Configuration
Pratica correlata
Domanda del libro di testo
A possible alternative mechanism to that shown in Problem 47 for the monochlorination of methane involves the following propagation steps:
How do you know that the reaction does not take place by this mechanism?
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Domanda del libro di testo
Calculate the ∆H° value for the following reaction:
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