교과서 질문
Predict the major products of the following reactions, including stereochemistry where appropriate.
(n) sodium ethoxide + 2-methyl-2-bromobutane
(o) octan-1-ol + DMSO + oxalyl chloride
(p) 4-cyclopentylhexan-1-ol + DMP reagent
1274
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Ch.11 - Reactions of Alcohols
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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TOC.tableOfContents
- 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
11장, 문제 40a,b,c
Show how you would convert 2-methylcyclopentanol to the following products. Any of these products may be used as the reactant in any subsequent part of this problem.
a. 1-methylcyclopentene
b. 2-methylcyclopentyl tosylate
c. 2-methylcyclopentanone
검증된 단계별 안내1
Step 1: To convert 2-methylcyclopentanol to 1-methylcyclopentene (product a), perform an acid-catalyzed dehydration reaction. Use a strong acid like H₂SO₄ or H₃PO₄ to protonate the hydroxyl group, creating a good leaving group (water). Then, the carbocation intermediate undergoes rearrangement to form the more stable tertiary carbocation, followed by elimination of a proton to yield the alkene.
Step 2: To convert 2-methylcyclopentanol to 2-methylcyclopentyl tosylate (product b), react the alcohol with p-toluenesulfonyl chloride (TsCl) in the presence of a base like pyridine. This reaction replaces the hydroxyl group with a tosyl group (-OTs), creating a good leaving group for subsequent substitution or elimination reactions.
Step 3: To convert 2-methylcyclopentanol to 2-methylcyclopentanone (product c), perform an oxidation reaction. Use an oxidizing agent such as PCC (pyridinium chlorochromate) or Jones reagent (CrO₃/H₂SO₄) to oxidize the secondary alcohol to a ketone. Ensure mild conditions to avoid overoxidation.
Step 4: Recognize that any of the products (a, b, or c) can be used as reactants for further transformations. For example, 1-methylcyclopentene can undergo hydroboration-oxidation to form an alcohol, or 2-methylcyclopentyl tosylate can undergo nucleophilic substitution to introduce new functional groups.
Step 5: Carefully analyze the reaction conditions and mechanisms for each transformation to ensure proper stereochemistry and regioselectivity, especially in cases involving carbocation rearrangements or oxidation reactions.
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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
6m주요 개념
질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.
Alcohol Dehydration
Alcohol dehydration is a key reaction in organic chemistry where an alcohol is converted into an alkene through the elimination of water. In the case of converting 2-methylcyclopentanol to 1-methylcyclopentene, this process typically involves heating the alcohol with an acid catalyst, leading to the formation of a double bond and the release of water.
추천 영상:
01:23
General Reaction of Dehydration with POCl3
Nucleophilic Substitution
Nucleophilic substitution is a fundamental reaction mechanism in organic chemistry where a nucleophile replaces a leaving group in a molecule. For the conversion of 2-methylcyclopentanol to 2-methylcyclopentyl tosylate, the hydroxyl group of the alcohol is converted into a better leaving group (tosylate) through reaction with tosyl chloride, facilitating subsequent nucleophilic attack.
추천 영상:
01:47Nucleophiles and Electrophiles can react in Substitution Reactions.
Oxidation of Alcohols
The oxidation of alcohols is a process where alcohols are converted into carbonyl compounds, such as ketones or aldehydes, by the addition of oxidizing agents. To convert 2-methylcyclopentanol to 2-methylcyclopentanone, an oxidizing agent like chromic acid or PCC can be used to facilitate the transformation, resulting in the formation of a ketone.
추천 영상:
05:53Strong oxidizing agents
관련 실천
교과서 질문
In each case, show how you would synthesize the chloride, bromide, and iodide from the corresponding alcohol.
(a) 1-halobutane (halo = chloro, bromo, iodo)
(b) halocyclopentane
1274
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교과서 질문
Predict the major products of the following reactions, including stereochemistry where appropriate.
(k) cyclopentanol + H2SO4/heat
(l) product from (k) + OsO4/H2O2, then HIO4
(m) sodium ethoxide + 1-bromobutane
935
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교과서 질문
Predict the major products of the following reactions, including stereochemistry where appropriate.
(h) cyclooctylmethanol + CH3CH2MgBr
(i) potassium tert-butoxide + methyl iodide
(j) sodium methoxide + tert-butyl iodide
1871
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교과서 질문
Show how you would convert 2-methylcyclopentanol to the following products. Any of these products may be used as the reactant in any subsequent part of this problem.
(g) 2-methylcyclopentyl acetate
(h) 1-bromo-1-methylcyclopentane
1603
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교과서 질문
Show how you would convert 2-methylcyclopentanol to the following products. Any of these products may be used as the reactant in any subsequent part of this problem.
d. 1-methylcyclopentanol
713
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