Textbook Question
Indicate how each of the following compounds can be synthesized from the given starting material and any other necessary reagents:
b.
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Ch. 17 - Reactions at the Alpha-Carbon
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- 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
Chapter 18, Problem 66c
Indicate how each of the following compounds can be synthesized from the given starting material and any other necessary reagents:
c. 
Verified step by step guidance1
Step 1: Analyze the starting material and the target compound. The starting material is an ethyl acetoacetate derivative, and the target compound is a ketone with a cyclohexyl group attached. This suggests that a nucleophilic substitution followed by cyclization is required.
Step 2: Perform an alkylation reaction on the ethyl acetoacetate derivative. Use a suitable alkyl halide, such as bromocyclohexane, and a strong base like sodium ethoxide (NaOEt) to deprotonate the alpha-carbon of the starting material. This generates a nucleophilic enolate ion that can attack the alkyl halide, forming a new C-C bond.
Step 3: Hydrolyze the ester group in the alkylated product. Use acidic or basic hydrolysis conditions to convert the ester group into a carboxylic acid. This step prepares the molecule for decarboxylation.
Step 4: Decarboxylate the carboxylic acid under heating conditions. This step removes the carboxyl group, leaving behind the desired ketone structure with the cyclohexyl group attached.
Step 5: Purify the final product using appropriate techniques such as distillation or recrystallization to isolate the target ketone compound.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acetoacetic Ester Synthesis
Acetoacetic ester synthesis is a method for forming ketones through the reaction of an acetoacetic ester with an alkyl halide. This process involves the enolate ion of the acetoacetic ester attacking the alkyl halide, leading to the formation of a new carbon-carbon bond. The resulting compound can then undergo hydrolysis and decarboxylation to yield a ketone.
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Enolate Chemistry
Enolates are reactive intermediates formed from the deprotonation of carbonyl compounds, such as esters or ketones. They are crucial in nucleophilic addition reactions, where they can act as nucleophiles to attack electrophiles. Understanding enolate stability and reactivity is essential for predicting the outcomes of reactions involving acetoacetic esters and other carbonyl compounds.
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Reagents and Reaction Conditions
The choice of reagents and reaction conditions significantly influences the outcome of organic reactions. In acetoacetic ester synthesis, common reagents include strong bases (like sodium ethoxide) for deprotonation and alkyl halides for alkylation. Additionally, controlling temperature and solvent can affect the reaction rate and selectivity, making it vital to understand these factors for successful synthesis.
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Related Practice
Textbook Question
The Reformatsky reaction is an addition reaction in which an organozinc reagent is used instead of a Grignard reagent to add to the carbonyl group of an aldehyde or a ketone. Because the organozinc reagent is less reactive than a Grignard reagent, a nucleophilic addition to the ester group does not occur.
The organozinc reagent is prepared by treating an α-bromo ester with zinc.
Describe how each of the following compounds can be prepared, using a Reformatsky reaction:
c.
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Textbook Question
The ketone whose 1H NMR spectrum is shown here was obtained as the product of an acetoacetic ester synthesis. What alkyl halide was used in the synthesis?
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Textbook Question
The Reformatsky reaction is an addition reaction in which an organozinc reagent is used instead of a Grignard reagent to add to the carbonyl group of an aldehyde or a ketone. Because the organozinc reagent is less reactive than a Grignard reagent, a nucleophilic addition to the ester group does not occur. The organozinc reagent is prepared by treating an α-bromo ester with zinc.
Describe how each of the following compounds can be prepared, using a Reformatsky reaction:
a.
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Textbook Question
There are other condensation reactions similar to the aldol and Claisen condensations:
c. The Knoevenagel condensation is the condensation of an aldehyde or a ketone that has no a-hydrogens and a compound such as diethyl malonate that has an a-carbon flanked by two electron-withdrawing groups. Draw the product obtained from the following Knoevenagel condensation:
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Textbook Question
What product is obtained when the product of a Knoevenagel condensation is heated in an aqueous acidic solution?
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