Textbook Question
Predict the products you would expect from the reaction of NaBH4 with the following compounds. You may assume that these reactions take place in methanol as the solvent.
(c) Ph-COOH
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Ch.10 - Structure and Synthesis of Alcohols
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
Chapter 10, Problem 24d
Predict the products you would expect from the reaction of NaBH4 with the following compounds. You may assume that these reactions take place in methanol as the solvent.
(d) 
Verified step by step guidance1
Step 1: Identify the functional group in the given compound. The structure provided is a cyclic ketone, specifically cyclohexanone, which contains a carbonyl group (C=O).
Step 2: Understand the role of NaBH4 in organic reactions. Sodium borohydride (NaBH4) is a reducing agent commonly used to reduce ketones and aldehydes to their corresponding alcohols.
Step 3: Predict the reaction mechanism. NaBH4 donates hydride ions (H⁻) to the electrophilic carbon of the carbonyl group, breaking the double bond and forming a single bond with the addition of a hydrogen atom.
Step 4: Consider the solvent methanol. Methanol acts as a proton source, providing a hydrogen atom to the oxygen atom of the carbonyl group, completing the reduction process.
Step 5: Determine the product. The reduction of cyclohexanone with NaBH4 in methanol will yield cyclohexanol, a secondary alcohol, as the product.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Sodium Borohydride (NaBH4) as a Reducing Agent
Sodium borohydride (NaBH4) is a mild reducing agent commonly used in organic chemistry to reduce carbonyl compounds, such as aldehydes and ketones, to their corresponding alcohols. It donates hydride ions (H-) to the electrophilic carbon of the carbonyl group, facilitating the reduction process. Understanding its reactivity and selectivity is crucial for predicting the products of reactions involving NaBH4.
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Reducing Agents
Mechanism of Reduction Reactions
The mechanism of reduction reactions typically involves the nucleophilic attack of the hydride ion on the carbonyl carbon, followed by protonation to form an alcohol. This process can be visualized in two steps: first, the formation of a tetrahedral intermediate, and then the collapse of this intermediate to yield the alcohol product. Familiarity with this mechanism helps in predicting the outcome of reactions involving carbonyl compounds.
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Solvent Effects in Organic Reactions
The choice of solvent can significantly influence the course of organic reactions. In this case, methanol serves as a polar protic solvent, which can stabilize charged intermediates and facilitate proton transfer. Understanding how solvents affect reaction rates, product distribution, and the stability of intermediates is essential for accurately predicting the products of the reaction with NaBH4.
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Related Practice
Textbook Question
Predict the products you would expect from the reaction of NaBH4 with the following compounds. You may assume that these reactions take place in methanol as the solvent.
(e)
1
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Textbook Question
Point out the flaws in the following incorrect Grignard syntheses.
(c)
(d)
3
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Textbook Question
Predict the products you would expect from the reaction of NaBH4 with the following compounds. You may assume that these reactions take place in methanol as the solvent.
(a) CH3–(CH2)8–CHO
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Textbook Question
Predict the products you would expect from the reaction of NaBH4 with the following compounds. You may assume that these reactions take place in methanol as the solvent.
(f)
4
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Textbook Question
Predict the products you would expect from the reaction of LiAlH4 followed by hydrolysis with the following compounds. You may assume that these reactions take place in methanol as the solvent.
(a) CH3–(CH2)8–CHO
1
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