Domanda del libro di testo
What are the major products obtained when each of the following ethers is heated with one equivalent of HI?
e.
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Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds
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
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Bruice 8th EditionCh. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblema 25
Bruice 8th EditionCh. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblema 25Capitolo 10, Problema 25
Explain why methyl propyl ether forms both methyl iodide and propyl iodide when it is heated with excess HI.
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When methyl propyl ether (CH₃OCH₂CH₂CH₃) is heated with excess HI, the reaction proceeds via an acid-catalyzed cleavage of the ether bond. The first step involves the protonation of the ether oxygen by HI, forming an oxonium ion (R-O⁺-R').
The oxonium ion is unstable and undergoes cleavage to form two products: a methyl group (CH₃⁺) and a propyl group (CH₂CH₂CH₃⁺). This cleavage occurs because ethers are susceptible to nucleophilic attack after protonation.
The iodide ion (I⁻) from HI acts as a nucleophile and attacks the carbocation formed during the cleavage. Depending on which bond breaks, either methyl iodide (CH₃I) or propyl iodide (CH₃CH₂CH₂I) is formed.
The cleavage of the ether bond is influenced by the stability of the carbocation intermediates. In this case, both methyl and propyl carbocations can form, but the reaction proceeds with both pathways due to the excess HI present.
As a result, both methyl iodide and propyl iodide are formed as products of the reaction, with the iodide ion reacting with each carbocation formed during the cleavage of the ether bond.
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Ether Cleavage
Ether cleavage is a reaction where ethers are broken down into their corresponding alcohols and alkyl halides in the presence of strong acids, such as HI. In this process, the ether bond (C-O) is cleaved, leading to the formation of two alkyl halides. This reaction is significant in organic chemistry as it demonstrates how ethers can be transformed into more reactive species.
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Percorso guidato
1:45
Cleavage of Phenyl Ethers Concept 1
Nucleophilic Substitution
Nucleophilic substitution is a fundamental reaction mechanism in organic chemistry where a nucleophile replaces a leaving group in a molecule. In the case of methyl propyl ether reacting with HI, the iodide ion (I-) acts as a nucleophile, attacking the carbon atoms bonded to the ether oxygen, resulting in the formation of methyl iodide and propyl iodide. Understanding this mechanism is crucial for predicting the products of ether cleavage.
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01:47Nucleophiles and Electrophiles can react in Substitution Reactions.
Reactivity of Alkyl Halides
The reactivity of alkyl halides is influenced by the structure of the carbon atom to which the halide is attached. Methyl and primary alkyl halides, like those formed from methyl propyl ether, are generally more reactive towards nucleophiles due to less steric hindrance. This reactivity is essential in understanding why both methyl iodide and propyl iodide are produced when the ether is heated with excess HI.
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01:52How to name alkyl halides
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