교과서 질문
Show how you would synthesize the following ethers in good yield from the indicated starting materials and any additional reagents needed.
(d) 1-methoxydecane from a decene
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Ch. 14 - Ethers, Epoxides, and Thioethers
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
14장, 문제 45f
Show how you would synthesize the following ethers in good yield from the indicated starting materials and any additional reagents needed.
(f) trans-2,3-epoxyoctane from octan-2-ol
검증된 단계별 안내1
Step 1: Begin with the starting material, octan-2-ol. The hydroxyl group (-OH) on the alcohol will need to be converted into a good leaving group to facilitate the formation of the epoxide.
Step 2: Convert the hydroxyl group into a good leaving group by treating octan-2-ol with a reagent like p-toluenesulfonyl chloride (TsCl) in the presence of a base such as pyridine. This forms the tosylate derivative, which is a better leaving group.
Step 3: Perform an intramolecular Williamson ether synthesis to form the epoxide. Treat the tosylate derivative with a strong base, such as sodium hydride (NaH) or potassium tert-butoxide (KOtBu). The base will deprotonate the adjacent hydroxyl group, creating an alkoxide ion that can attack the carbon bearing the tosylate group in an SN2 reaction, forming the epoxide.
Step 4: Ensure stereochemical control to obtain the trans-2,3-epoxyoctane. The reaction conditions should favor inversion of configuration at the carbon undergoing the SN2 reaction, resulting in the trans product.
Step 5: Purify the product using techniques such as distillation or chromatography to isolate trans-2,3-epoxyoctane in good yield.
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주요 개념
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Ethers and Their Synthesis
Ethers are organic compounds characterized by an oxygen atom connected to two alkyl or aryl groups. Their synthesis often involves the reaction of alcohols with dehydrating agents or through the Williamson ether synthesis, which utilizes alkoxides and alkyl halides. Understanding these methods is crucial for effectively synthesizing ethers from given starting materials.
추천 영상:
가이드 코스
03:50
The Mechanism of Williamson Ether Synthesis.
Epoxide Formation
Epoxides are cyclic ethers with a three-membered ring structure that includes an oxygen atom. They can be synthesized from alkenes through reactions with peracids or by the intramolecular cyclization of alcohols. Recognizing how to form epoxides is essential for converting octan-2-ol into trans-2,3-epoxyoctane in the synthesis process.
추천 영상:
가이드 코스
02:19General properties of epoxidation.
Stereochemistry and Configuration
Stereochemistry refers to the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the case of trans-2,3-epoxyoctane, understanding the stereochemical implications of the starting material and the reaction conditions is vital for achieving the desired configuration. This knowledge helps predict the outcome of reactions and the stability of the resulting compounds.
추천 영상:
1:38Polymer Stereochemistry Concept 1
관련 실천
교과서 질문
There are two different ways of making 2-ethoxyoctane from octan-2-ol using the Williamson ether synthesis. When pure (–)-octan-2-ol of specific rotation -8.24° is treated with sodium metal and then ethyl iodide, the product is 2-ethoxyoctane with a specific rotation of -15.6°. When pure (–)-octan-2-ol is treated with tosyl chloride and pyridine and then with sodium ethoxide, the product is also 2-ethoxyoctane. Predict the rotation of the 2-ethoxyoctane made using the tosylation/sodium ethoxide procedure, and propose a detailed mechanism to support your prediction.
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교과서 질문
An acid-catalyzed reaction was carried out using methyl cellosolve (2-methoxyethanol) as the solvent. When the 2-methoxyethanol was redistilled, a higher-boiling fraction (bp 162°C) was also recovered. The mass spectrum of this fraction showed the molecular weight to be 134. The IR and NMR spectra are shown here. Determine the structure of this compound, and propose a mechanism for its formation.
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1388
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교과서 질문
Show how you would synthesize the following ethers in good yield from the indicated starting materials and any additional reagents needed.
(c) 2-ethoxyoctane from an octene
548
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교과서 질문
Show how you would convert 3-bromocyclohexanol to the following diol. You may use any additional reagents you need.
1173
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교과서 질문
Show how you would synthesize the following ethers in good yield from the indicated starting materials and any additional reagents needed.
(e) 1-ethoxy-1-methylcyclohexane from 2-methylcyclohexanol
555
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