Textbook Question
What products will be obtained from the E2 reaction of the following alkyl halides?
a.
1291
views
Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
Not the one you use?Change textbookSelect a different textbook
Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- 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
All textbooks
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 45c
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 45cChapter 10, Problem 45c
What products will be obtained from the E2 reaction of the following alkyl halides?
c. 
Verified step by step guidance1
Step 1: Identify the alkyl halide structure. The given compound is 3-chloro-2-methyl-2-pentene. The chlorine atom is attached to the third carbon, and there is a double bond between the second and third carbons.
Step 2: Understand the E2 elimination mechanism. E2 reactions require a strong base and proceed via a single-step mechanism where the base abstracts a proton from a β-carbon (adjacent to the carbon bearing the leaving group), and the leaving group (Cl) departs simultaneously, forming a double bond.
Step 3: Determine the β-hydrogens available for elimination. In this molecule, the β-carbons are the first and fourth carbons relative to the carbon bearing the chlorine atom. The first carbon has three hydrogens, while the fourth carbon has one hydrogen.
Step 4: Consider the stereoelectronic requirement for E2 elimination. The β-hydrogen and the leaving group must be anti-periplanar (opposite sides of the same plane). This geometry will dictate which β-hydrogen can be abstracted by the base.
Step 5: Predict the products. Depending on the β-hydrogen abstracted, elimination will result in the formation of different alkenes. If a hydrogen from the first carbon is abstracted, the product will be 2-methyl-1-pentene. If the hydrogen from the fourth carbon is abstracted, the product will be 2,3-dimethyl-2-pentene. Both products are possible depending on the reaction conditions.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
5mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
E2 Reaction Mechanism
The E2 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, typically a halide. This concerted mechanism results in the formation of a double bond between the α and β carbons. Understanding the stereochemistry and the requirement for anti-periplanar geometry is crucial for predicting the products.
Recommended video:
Guided course
09:36
Drawing the E2 Mechanism.
Alkyl Halides
Alkyl halides are organic compounds containing a carbon atom bonded to a halogen atom (such as chlorine, bromine, or iodine). The reactivity of alkyl halides in elimination reactions depends on their structure, including whether they are primary, secondary, or tertiary. The type of alkyl halide influences the mechanism and the products formed during the E2 reaction.
Recommended video:
Guided course
01:52How to name alkyl halides
Stereochemistry in E2 Reactions
Stereochemistry plays a significant role in E2 reactions, as the elimination must occur in an anti-periplanar arrangement for optimal overlap of orbitals. This means that the hydrogen atom being removed and the leaving group must be on opposite sides of the molecule. Recognizing the spatial arrangement of substituents is essential for predicting the correct alkene products formed from the reaction.
Recommended video:
1:38Polymer Stereochemistry Concept 1
Related Practice
Textbook Question
What products will be obtained from the E1 reaction of the alkyl halides in [PROBLEM 9-45]?
b.
1347
views
Textbook Question
What products will be obtained from the E2 reaction of the following alkyl halides?
b.
999
views
Textbook Question
What products will be obtained from the E1 reaction of the alkyl halides in [PROBLEM 9-45]?
c.
1077
views
Textbook Question
What products will be obtained from the E1 reaction of the alkyl halides in [PROBLEM 9-45]?
a.
1230
views
Textbook Question
a. Assuming that the two compounds shown below have the same stability, which one would you expect to be more reactive in an SN1 reaction?
b. Draw the products that each would form when the solvent is ethanol.
1094
views