Domanda del libro di testo
Two stereoisomers are obtained from the reaction of cyclopentene oxide and dimethylamine. The R,R-isomer is used in the manufacture of eclanamine, an antidepressant. What other isomer is obtained?
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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 96b
Bruice 8th EditionCh. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblema 96bCapitolo 10, Problema 96b
Propose a mechanism for each of the following reactions:
b. 
Guida verificata passo dopo passo1
Step 1: Protonation of the alcohol group - The reaction begins with the protonation of the hydroxyl (-OH) group by sulfuric acid (H₂SO₄). This converts the alcohol into a better leaving group, forming a positively charged oxonium ion.
Step 2: Formation of a carbocation - The protonated alcohol group leaves as water (H₂O), resulting in the formation of a carbocation at the tertiary carbon. This step is facilitated by the stability of the tertiary carbocation.
Step 3: Ring expansion - The carbocation undergoes a ring expansion to relieve ring strain in the cyclopentane ring. A hydride shift or alkyl shift occurs, leading to the formation of a more stable cyclohexane ring structure.
Step 4: Elimination to form the double bond - A proton is abstracted from a neighboring carbon by the conjugate base of sulfuric acid (HSO₄⁻), resulting in the formation of a double bond. This step completes the formation of the alkene product.
Step 5: Final product - The final product is a cyclohexene derivative with a double bond and a methyl group attached to the ring. This is the result of the elimination reaction and ring expansion.
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Dehydration Reaction
A dehydration reaction involves the removal of a water molecule from a compound, typically resulting in the formation of a double bond. In organic chemistry, this process is often used to convert alcohols into alkenes. The reaction is facilitated by strong acids, such as sulfuric acid, which protonate the alcohol, making it a better leaving group.
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01:23
General Reaction of Dehydration with POCl3
Protonation and Carbocation Formation
In the presence of sulfuric acid, the hydroxyl group of the alcohol is protonated, leading to the formation of a carbocation intermediate. This step is crucial as it increases the electrophilicity of the molecule, allowing for the subsequent elimination of water. The stability of the carbocation significantly influences the reaction pathway and the final product.
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07:21Any Carbocation
Elimination Mechanism (E1 or E2)
The elimination mechanism can occur via either E1 or E2 pathways. In the E1 mechanism, the reaction proceeds through a two-step process involving carbocation formation followed by the loss of a proton to form the alkene. In contrast, the E2 mechanism is a concerted process where the base abstracts a proton while the leaving group departs, resulting in the formation of the double bond in a single step.
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09:36Drawing the E2 Mechanism.
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