Domanda del libro di testo
Starting with ethyne, describe how the following compounds can be synthesized:
a. (3S,4R)-4-bromo-3-hexanol and (3R,4S)-4-bromo-3-hexanol
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Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis
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. 7 - The Reactions of Alkynes • An Introduction to Multistep SynthesisProblema 59
Bruice 8th EditionCh. 7 - The Reactions of Alkynes • An Introduction to Multistep SynthesisProblema 59Capitolo 7, Problema 59
Show how the following compound can be prepared from the given starting material. Draw the structure of the compound that is formed in each step of the synthesis.
Guida verificata passo dopo passo1
Step 1: Begin with the starting material, prop-1-yne. The goal is to transform the triple bond into a structure that can lead to the formation of the final compound, a substituted epoxide.
Step 2: Perform hydroboration-oxidation on prop-1-yne. Use a bulky borane reagent like disiamylborane (Sia2BH) to selectively add across the triple bond, followed by oxidation with hydrogen peroxide (H2O2) and sodium hydroxide (NaOH). This will yield an anti-Markovnikov aldehyde, propanal.
Step 3: Convert the aldehyde (propanal) into a secondary alcohol. Use a Grignard reagent, such as methylmagnesium bromide (CH3MgBr), to add a methyl group to the carbonyl carbon, followed by acidic workup. This will produce 2-butanol.
Step 4: Oxidize the secondary alcohol (2-butanol) to a ketone. Use an oxidizing agent like PCC (pyridinium chlorochromate) or Jones reagent (CrO3/H2SO4) to convert the alcohol into 2-butanone.
Step 5: Perform epoxidation of the ketone (2-butanone). Use a reagent like a peracid (e.g., mCPBA) to form the epoxide ring, resulting in the final compound, 2,2-dimethyloxirane.
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Alkyne Reactivity
Alkynes, such as prop-1-yne, are hydrocarbons containing a carbon-carbon triple bond. This triple bond makes them highly reactive, allowing them to undergo various reactions, including addition reactions. Understanding the reactivity of alkynes is crucial for predicting the products formed during synthesis, especially when converting them into functionalized compounds like carbonyls.
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Alkyne Hydration
Carbonyl Group Formation
The carbonyl group (C=O) is a functional group found in aldehydes and ketones, which are important in organic synthesis. The formation of a carbonyl group from an alkyne typically involves oxidation reactions. Recognizing the mechanisms that lead to carbonyl formation is essential for successfully completing the synthesis from prop-1-yne to the desired product.
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03:50Intro to Carboxylic Acid Derivatives
Synthesis Pathways
Synthesis pathways outline the step-by-step reactions needed to convert one compound into another. In organic chemistry, understanding how to draw and interpret these pathways is vital for visualizing the transformation of reactants into products. This includes identifying intermediates and the reagents required at each stage, which is key to solving the given synthesis problem.
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2:13Energy Production In Biochemical Pathways Concept 1
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