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What is the major elimination product obtained from an E2 reaction of each of the following alkyl halides with hydroxide ion?
f.
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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 24a,b
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblema 24a,bCapitolo 9, Problema 24a,b
Which alkyl halide in each pair is more reactive in an E2 reaction with hydroxide ion?
a. 
b. 
Guida verificata passo dopo passo1
Step 1: Understand the E2 reaction mechanism. E2 reactions are bimolecular elimination reactions where a base (such as hydroxide ion) removes a proton from a β-carbon, and a leaving group (such as a halide) departs simultaneously, forming a double bond.
Step 2: Analyze the first pair of alkyl halides. The first structure is a primary alkyl bromide, while the second structure is a secondary alkyl bromide. Secondary alkyl halides are generally more reactive in E2 reactions because the transition state is stabilized by hyperconjugation and inductive effects.
Step 3: Analyze the second pair of alkyl halides. The first structure is cyclohexyl chloride, and the second structure is cyclohexyl bromide. Bromide is a better leaving group than chloride due to its larger size and weaker bond to carbon, making cyclohexyl bromide more reactive in an E2 reaction.
Step 4: Consider steric hindrance and leaving group ability. In the first pair, the secondary alkyl bromide has less steric hindrance at the β-carbon compared to the primary alkyl bromide, facilitating the elimination process. In the second pair, bromide's superior leaving group ability makes it more favorable for elimination.
Step 5: Conclude that for the first pair, the secondary alkyl bromide is more reactive in an E2 reaction. For the second pair, cyclohexyl bromide is more reactive due to the better leaving group ability of bromide compared to chloride.
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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, leading to the simultaneous departure of a leaving group from the α-carbon. This concerted mechanism results in the formation of a double bond. Understanding the E2 mechanism is crucial for predicting the reactivity of alkyl halides, as the structure and sterics of the substrate significantly influence the reaction rate.
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Drawing the E2 Mechanism.
Alkyl Halide Structure
Alkyl halides are organic compounds containing a carbon atom bonded to a halogen atom (F, Cl, Br, I). The reactivity of alkyl halides in E2 reactions is influenced by their structure, particularly the degree of substitution (primary, secondary, or tertiary). Tertiary alkyl halides are generally more reactive in E2 reactions due to steric factors that stabilize the transition state, making it easier for the base to abstract a proton.
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Base Strength and Sterics
The strength and steric hindrance of the base used in an E2 reaction play a significant role in determining the reaction's outcome. Strong bases, such as hydroxide ion (OH-), are more effective at abstracting protons, while sterically hindered bases may favor elimination over substitution. The choice of base can influence which alkyl halide is more reactive, as bulky bases may favor reactions with less hindered substrates.
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