Domanda del libro di testo
Show how you would accomplish the following syntheses in good yields.
(b)
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Ch. 21 - Carboxylic Acid Derivatives
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
Capitolo 21, Problema 47c
Predict the products of saponification of the following esters.
(c) 
Guida verificata passo dopo passo1
Step 1: Recognize that saponification is the base-catalyzed hydrolysis of an ester. The ester reacts with a strong base (e.g., NaOH) to produce a carboxylate salt and an alcohol.
Step 2: Identify the ester functional group in the given structure. The ester bond is between the oxygen atom and the carbonyl group (C=O). In this case, the ester is part of a benzyl acetate structure.
Step 3: Break the ester bond during saponification. The carbonyl carbon is attacked by the hydroxide ion (OH⁻), leading to the cleavage of the bond between the oxygen and the carbonyl carbon.
Step 4: Determine the products formed. The carbonyl group becomes a carboxylate ion (R-COO⁻), and the alcohol group (R-OH) is released. For this structure, the carboxylate salt will be derived from the acetic acid portion, and the alcohol will be benzyl alcohol.
Step 5: Write the general reaction for clarity: R-COOR' + OH⁻ → R-COO⁻ + R'-OH. Substitute the specific groups from the given structure to predict the products: benzyl alcohol (C₆H₅CH₂OH) and sodium acetate (CH₃COO⁻Na⁺).
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Saponification
Saponification is a chemical reaction that involves the hydrolysis of an ester in the presence of a strong base, typically sodium hydroxide (NaOH) or potassium hydroxide (KOH). This reaction produces an alcohol and a carboxylate salt, which is commonly known as soap. Understanding this process is crucial for predicting the products of ester reactions.
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03:27
Mechanism
Esters
Esters are organic compounds formed from the reaction of an alcohol and a carboxylic acid, characterized by the functional group -COO-. They often have distinctive odors and are commonly found in fats and oils. Recognizing the structure of esters is essential for predicting the outcome of their reactions, including saponification.
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02:39Ester Nomenclature
Nucleophilic Acyl Substitution
Nucleophilic acyl substitution is a fundamental reaction mechanism in organic chemistry where a nucleophile attacks the carbonyl carbon of an acyl compound, such as an ester. In saponification, hydroxide ions act as the nucleophile, leading to the formation of a carboxylate ion and an alcohol. This mechanism is key to understanding how esters react under basic conditions.
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01:47Nucleophiles and Electrophiles can react in Substitution Reactions.
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Predict the products of saponification of the following esters.
(b)
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Acid-catalyzed transesterification and Fischer esterification take place by nearly identical mechanisms. Transesterification can also take place by a base-catalyzed mechanism, but all attempts at base-catalyzed Fischer esterification (using –OR″, for example) seem doomed to failure. Explain why Fischer esterification cannot be catalyzed by base.
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Predict the products of saponification of the following esters.
(d)
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Show how you would accomplish the following syntheses in good yields.
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Predict the products of saponification of the following esters.
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