Textbook Question
Draw perspective structures or Fischer projections for the substitution products of the following reactions.
(b)
3
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Ch.6 - Alkyl Halides; Nucleophilic Substitution
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- 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
Chapter 6, Problem 45e,f
Predict the products of the following SN2 reactions.
(e) 
(f) 
Verified step by step guidance1
Step 1: Understand the SN2 reaction mechanism. SN2 reactions involve a single-step nucleophilic substitution where the nucleophile attacks the electrophilic carbon, displacing the leaving group. The reaction proceeds with inversion of configuration at the carbon center.
Step 2: For part (e), identify the nucleophile and electrophile. The nucleophile is pyridine (C5H5N), which has a lone pair on nitrogen, and the electrophile is methyl iodide (CH3I). The nitrogen in pyridine will attack the methyl carbon in CH3I, displacing the iodide ion (I⁻).
Step 3: Predict the product for part (e). The nitrogen in pyridine will form a bond with the methyl group, resulting in a methylated pyridinium ion (C5H5N-CH3⁺). The iodide ion (I⁻) will be the counterion.
Step 4: For part (f), identify the nucleophile and electrophile. The nucleophile is ammonia (NH3), and the electrophile is the alkyl bromide ((CH3)3C-CH2CH2Br). Ammonia will attack the electrophilic carbon bonded to bromine, displacing the bromide ion (Br⁻).
Step 5: Predict the product for part (f). The primary product will be a substituted amine ((CH3)3C-CH2CH2-NH2). Since excess ammonia is present, further substitution reactions may occur, leading to secondary and tertiary amines, as well as quaternary ammonium salts.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
S<sub>N</sub>2 Mechanism
The S<sub>N</sub>2 mechanism is a type of nucleophilic substitution reaction where a nucleophile attacks an electrophile, resulting in the simultaneous displacement of a leaving group. This reaction occurs in a single concerted step, leading to the formation of a new bond while breaking an existing one. The reaction rate depends on the concentration of both the nucleophile and the substrate, making it bimolecular.
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Creating Ribonucleosides
Nucleophiles
Nucleophiles are species that donate an electron pair to form a chemical bond in a reaction. They are typically negatively charged or neutral molecules with lone pairs of electrons. In the context of S<sub>N</sub>2 reactions, a strong nucleophile is essential for effectively attacking the electrophile, which in this case is the carbon atom bonded to the leaving group (iodine in CH<sub>3</sub>I).
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Leaving Groups
Leaving groups are atoms or groups of atoms that can depart from the parent molecule during a chemical reaction, taking with them an electron pair. A good leaving group is typically stable after departure and can stabilize the negative charge, such as iodide (I<sup>-</sup>) in the case of S<sub>N</sub>2 reactions. The ability of a leaving group to leave affects the reaction's rate and mechanism.
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Related Practice
Textbook Question
Predict the products of the following SN2 reactions.
(a)
(b)
1
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Textbook Question
Using cyclohexane as one of your starting materials, show how you would synthesize the following compounds.
(c)
1
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Textbook Question
Predict the products of the following SN2 reactions.
(c)
(d)
3
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Textbook Question
Using cyclohexane as one of your starting materials, show how you would synthesize the following compounds.
(e)
1
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Textbook Question
Using cyclohexane as one of your starting materials, show how you would synthesize the following compounds.
(a)
3
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