Domanda del libro di testo
Draw Lewis structures for the following free radicals.
a. The ethyl radical, CH3—ĊH2
b. The tert-butyl radical, (CH3)3C•
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Ch.4 - The Study of Chemical Reactions
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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TOC.tableOfContents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Capitolo 4, Problema 2a
Write the propagation steps leading to the formation of dichloromethane (CH2Cl2) from chloromethane.
Guida verificata passo dopo passo1
Step 1: Understand the context of the problem. This is a free radical halogenation reaction involving chloromethane (CH3Cl) and chlorine (Cl2). The propagation steps are part of the chain reaction mechanism where radicals are involved.
Step 2: Write the first propagation step. A chlorine radical (Cl•) reacts with chloromethane (CH3Cl), abstracting a hydrogen atom to form a methyl radical (•CH2Cl) and HCl. The reaction can be represented as: Cl• + CH3Cl → •CH2Cl + HCl.
Step 3: Write the second propagation step. The methyl radical (•CH2Cl) reacts with a chlorine molecule (Cl2), forming dichloromethane (CH2Cl2) and regenerating a chlorine radical (Cl•). The reaction can be represented as: •CH2Cl + Cl2 → CH2Cl2 + Cl•.
Step 4: Recognize that these propagation steps are part of a chain reaction. The chlorine radical generated in the second step can go on to react with another molecule of chloromethane, continuing the cycle.
Step 5: Ensure the overall reaction mechanism is balanced and consistent with the principles of radical halogenation. The propagation steps demonstrate how dichloromethane is formed through successive reactions involving radicals.
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Free Radical Halogenation
Free radical halogenation is a reaction mechanism where alkanes react with halogens (like Cl2) in the presence of heat or light to form alkyl halides. This process involves the generation of free radicals, which are highly reactive species with unpaired electrons. The reaction proceeds through three main steps: initiation, propagation, and termination, with the propagation steps being crucial for the formation of products like dichloromethane.
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Radical Chain Reaction Mechanism.
Propagation Steps
Propagation steps in a free radical reaction are the stages where the free radicals react with the substrate to form new radicals and products. In the case of chloromethane to dichloromethane, the chlorine radical abstracts a hydrogen atom from chloromethane, forming dichloromethane and generating a new methyl radical, which can further react with another chlorine molecule. This cycle continues until termination occurs.
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Percorso guidato
1:05Step-Growth Polymers Concept 1
Selectivity in Halogenation
Selectivity in halogenation refers to the preference of a halogen to react with certain hydrogen atoms over others in a molecule. In the case of chloromethane, the chlorine radical can abstract hydrogen from the methyl group, leading to the formation of dichloromethane. The selectivity is influenced by factors such as the stability of the resulting radicals and the bond dissociation energies of the C-H bonds.
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03:45Halogenation Mechanism
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Explain why free-radical halogenation usually gives mixtures of products.
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How could an industrial plant control the proportions of methane and chlorine to favor production of CCl4? To favor production of CH3Cl?
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