Textbook Question
What products would you expect from the following Suzuki coupling reactions?
(a)
2
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Ch. 17 - Reactions of Aromatic Compounds
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 17, Problem 27a
What products would you expect from the following reactions?
(a) 
Verified step by step guidance1
Step 1: Recognize that both reactions involve palladium-catalyzed coupling reactions. Specifically, these are Heck reactions, where an aryl or vinyl halide reacts with an alkene in the presence of a palladium catalyst, a phosphine ligand (PPh3), and a base (Et3N).
Step 2: For reaction (a), identify the reactants: the aryl bromide (4-bromoacetophenone) and the alkene (isobutylene). The palladium catalyst (PdCl2) facilitates the coupling of the aryl bromide with the alkene, forming a new C-C bond. The regioselectivity of the Heck reaction typically favors the formation of the product where the alkene adds to the less sterically hindered position of the aryl group.
Step 3: For reaction (b), identify the reactants: the vinyl bromide (1-bromo-2-butene) and the styrene derivative (4-methoxystyrene). The palladium catalyst (Pd(OAc)2) facilitates the coupling of the vinyl bromide with the styrene derivative. The reaction proceeds with the formation of a new C-C bond between the vinyl group and the styrene derivative, typically at the β-position of the alkene.
Step 4: Consider the stereochemistry and regioselectivity of the products. In both reactions, the Heck reaction generally proceeds with trans-selectivity, meaning the substituents on the newly formed double bond will be opposite to each other. Additionally, the electronic and steric properties of the substituents influence the regioselectivity of the coupling.
Step 5: Draw the expected products for each reaction based on the coupling mechanism, regioselectivity, and stereochemistry. For reaction (a), the product will be a substituted alkene where the isobutylene adds to the aryl group. For reaction (b), the product will be a substituted alkene where the vinyl group adds to the styrene derivative.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Reaction Mechanisms
Understanding reaction mechanisms is crucial in organic chemistry as it describes the step-by-step process by which reactants transform into products. This includes identifying intermediates, transition states, and the movement of electrons. Familiarity with mechanisms helps predict the outcome of reactions and the types of products formed.
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Heck Reaction Mechanism
Functional Groups
Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. Recognizing functional groups allows chemists to predict reactivity and the types of products that can be formed during chemical reactions. Common functional groups include alcohols, carboxylic acids, and amines.
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Stereochemistry
Stereochemistry involves the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. It is essential for understanding isomerism, where compounds with the same molecular formula can have different structures and properties. Stereochemical considerations can significantly influence the products of reactions, especially in chiral environments.
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Related Practice
Textbook Question
What organocuprate reagent would you use for the following substitutions?
(a)
(b)
5
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Textbook Question
What substituted alkene would you use in the Heck reaction to make the following products?
(a)
(b)
Textbook Question
What products would you expect from the following reactions?
(a)
(b)
Textbook Question
The highly reactive triple bond of benzyne is a powerful dienophile. Predict the product of the Diels–Alder reaction of benzyne (from chlorobenzene and NaOH, heated) with cyclopentadiene.
4
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Textbook Question
What products would you expect from the following reactions?
(b)
1
views