Domanda del libro di testo
Predict the major products of the following reactions.
(c) 2-methylpent-2-ene + BH3⋅THF
(d) the product from part (c) + H2O2/OH−
1715
views
Ch.8 - Reactions of Alkenes
Wade9th EditionOrganic ChemistryISBN: 9780135213728
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
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
Capitolo 8, Problema 11a
Show how you would accomplish the following synthetic conversions.
a. but-1-ene → butan-1-ol
Guida verificata passo dopo passo1
Step 1: Begin by identifying the functional group transformation. In this case, you are converting an alkene (but-1-ene) into an alcohol (butan-1-ol). This typically involves an electrophilic addition reaction where water is added across the double bond.
Step 2: Use hydroboration-oxidation as the method for this transformation. Hydroboration-oxidation is a two-step reaction that converts alkenes into alcohols with anti-Markovnikov regioselectivity, ensuring the hydroxyl group (-OH) is added to the terminal carbon.
Step 3: In the first step of hydroboration, react but-1-ene with diborane (B₂H₆) or a borane reagent such as BH₃·THF (borane-tetrahydrofuran complex). This step forms an organoborane intermediate where boron attaches to the less substituted carbon of the double bond.
Step 4: In the second step, oxidize the organoborane intermediate using hydrogen peroxide (H₂O₂) in the presence of a base such as sodium hydroxide (NaOH). This oxidation replaces the boron atom with a hydroxyl group (-OH), yielding butan-1-ol.
Step 5: Verify the product structure to ensure the hydroxyl group is attached to the terminal carbon, confirming the anti-Markovnikov addition. The reaction sequence is complete, and the synthetic conversion is accomplished.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
7mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Electrophilic Addition
Electrophilic addition is a fundamental reaction mechanism in organic chemistry where an electrophile reacts with a nucleophile, typically involving alkenes. In the case of converting but-1-ene to butan-1-ol, the alkene undergoes electrophilic addition with water in the presence of an acid catalyst, leading to the formation of an alcohol. Understanding this mechanism is crucial for predicting the products of reactions involving alkenes.
Video consigliato:
09:23
1,2 vs 1,4 Addition
Markovnikov's Rule
Markovnikov's Rule states that in the addition of HX to an alkene, the hydrogen atom will attach to the carbon with the greater number of hydrogen atoms already attached. This principle helps predict the regioselectivity of the reaction when converting but-1-ene to butan-1-ol, ensuring that the hydroxyl group ends up on the more substituted carbon, resulting in the correct alcohol product.
Video consigliato:
03:54The 18 and 16 Electron Rule
Acid-Catalyzed Hydration
Acid-catalyzed hydration is a reaction where water adds to an alkene in the presence of an acid, facilitating the conversion of alkenes to alcohols. This process involves the formation of a carbocation intermediate, which can rearrange or react with water to form the alcohol. Recognizing this mechanism is essential for understanding how but-1-ene can be transformed into butan-1-ol through hydration.
Video consigliato:
06:34Acid-catalyzed hydration mechanism
Pratica correlata
Domanda del libro di testo
Predict the major products of the following reactions.
a. propene + BH3⋅THF
b. the product from part (a) + H2O2/OH−
2220
views
Domanda del libro di testo
Show how you would accomplish the following synthetic conversions.
c. 2-bromo-2,4-dimethylpentane → 2,4-dimethylpentan-3-ol
1416
views
Domanda del libro di testo
Show how you would accomplish the following synthetic conversions.
(b) but-1-ene → butan-2-ol
1045
views
Domanda del libro di testo
In the hydroboration of 1-methylcyclopentene shown in Solved Problem 8-3, the reagents are achiral, and the products are chiral. The product is a racemic mixture of trans-2-methylcyclopentanol, but only one enantiomer is shown. Show how the other enantiomer is formed.
1473
views
Domanda del libro di testo
Show how you would accomplish the following synthetic conversions.
c. 3-methylpent-1-ene → 3-methylpentan-2-ol
Explain why acid-catalyzed hydration would be a poor choice for the reaction in (c).
1141
views