Domanda del libro di testo
Give the structures of compounds A through B in the following series of reactions.
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Ch. 17 - Reactions of Aromatic Compounds
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 17, Problema 55c
What products would you expect from the following coupling reactions?
(c) 
Guida verificata passo dopo passo1
Step 1: Recognize the reaction type. This is a Suzuki coupling reaction, which involves the reaction of an organoboron compound (here, a phenylboronic acid derivative) with an organohalide (here, an allyl bromide) in the presence of a palladium catalyst and a base.
Step 2: Identify the components. The phenylboronic acid derivative provides the aryl group, while the allyl bromide provides the allyl group. The palladium catalyst facilitates the formation of a new carbon-carbon bond between these two groups.
Step 3: Understand the mechanism. The reaction proceeds through oxidative addition of the allyl bromide to the palladium catalyst, transmetalation with the phenylboronic acid derivative, and reductive elimination to form the coupled product.
Step 4: Predict the product. The new bond forms between the carbon atom of the phenyl group (from the boronic acid) and the carbon atom of the allyl group (from the allyl bromide). The product will be an aryl-allyl compound.
Step 5: Verify the structure. The final product will have the phenyl group directly bonded to the allyl group, maintaining the double bond in the allyl group and the methyl substituent on the allyl chain.
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Suzuki Coupling Reaction
The Suzuki coupling reaction is a widely used method in organic chemistry for forming carbon-carbon bonds. It involves the reaction of a boronic acid with an organic halide in the presence of a palladium catalyst and a base. This reaction is particularly valuable for synthesizing biaryl compounds and other complex organic molecules.
Palladium Catalysis
Palladium catalysis is crucial in many cross-coupling reactions, including the Suzuki reaction. Palladium serves as a catalyst that facilitates the oxidative addition of the organic halide and the subsequent transmetalation with the boronic acid. The ability of palladium to cycle between different oxidation states allows it to effectively promote these reactions.
Base in Coupling Reactions
In coupling reactions like the Suzuki reaction, a base is essential for deprotonating the boronic acid, generating a more reactive boronate species. The base also helps to neutralize the acidic byproducts formed during the reaction. Common bases used include sodium hydroxide or potassium carbonate, which enhance the efficiency of the coupling process.
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