Domanda del libro di testo
Which alkyl halide in each pair is more reactive in an E2 reaction with hydroxide ion?
c.
d.
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Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides
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. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblema 25c,d
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblema 25c,dCapitolo 9, Problema 25c,d
Which alkyl halide in each pair is more reactive in an E2 reaction with hydroxide ion?
c. 
d. 
Guida verificata passo dopo passo1
Step 1: Understand the E2 reaction mechanism. E2 reactions are bimolecular elimination reactions where a base removes a proton from a β-carbon, and a leaving group (such as Br) departs simultaneously, forming a double bond.
Step 2: Analyze the first pair of alkyl halides. The reactivity in E2 reactions depends on the ability of the β-hydrogen to be abstracted and the stability of the resulting alkene. The first structure is a secondary alkyl bromide, while the second structure is a primary alkyl bromide. Secondary alkyl halides are generally more reactive in E2 reactions due to the formation of a more stable alkene.
Step 3: Analyze the second pair of alkyl halides. Both structures contain a benzene ring, which can stabilize the resulting alkene through conjugation. The first structure has the bromine attached to a secondary carbon, while the second structure has the bromine attached to a primary carbon. The secondary alkyl bromide is more reactive in E2 reactions due to the stability of the alkene formed.
Step 4: Consider steric hindrance. In E2 reactions, steric hindrance around the β-hydrogen can affect the reaction rate. Secondary alkyl halides typically have less steric hindrance compared to tertiary alkyl halides, making them more reactive.
Step 5: Summarize the findings. For the first pair, the secondary alkyl bromide is more reactive. For the second pair, the secondary alkyl bromide attached to the benzene ring is more reactive due to the stabilization provided by conjugation with the aromatic ring.
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E2 Reaction Mechanism
The E2 (bimolecular elimination) reaction is a type of elimination reaction where a base removes a proton from a β-carbon while a leaving group departs from the α-carbon simultaneously. This concerted mechanism results in the formation of a double bond. The strength of the base and the structure of the alkyl halide significantly influence the reaction rate and outcome.
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Drawing the E2 Mechanism.
Alkyl Halide Reactivity
The reactivity of alkyl halides in E2 reactions is influenced by steric hindrance and the nature of the leaving group. Generally, tertiary alkyl halides are more reactive than secondary, which are more reactive than primary halides due to steric factors that affect the accessibility of the β-hydrogen to the base. A better leaving group also enhances reactivity.
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Role of Hydroxide Ion
Hydroxide ion (OH-) is a strong base commonly used in E2 reactions. Its ability to abstract a proton from the β-carbon is crucial for the elimination process. The strength of the base can affect the reaction pathway, and in the presence of a strong base like hydroxide, the E2 mechanism is favored over substitution reactions.
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3:39Metal Ion Catalysis Concept 1
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