Textbook Question
Consider the following compounds that vary from nearly nonacidic to strongly acidic. Draw the conjugate bases of these compounds, and explain why the acidity increases so dramatically with substitution by nitro groups.
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Ch. 2 - Acids and Bases; Functional Groups
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 2, Problem 50b
Label the reactants in these acid–base reactions as Lewis acids (electrophiles) or Lewis bases (nucleophiles). Use curved arrows to show the movement of electron pairs in the reactions.
(b) 
Verified step by step guidance1
Identify the reactants: [CH3O(CH3)2]+ is a positively charged species, indicating it is electron-deficient and can act as a Lewis acid (electrophile). OH2 (water) has lone pairs of electrons, making it a Lewis base (nucleophile).
Determine the direction of electron pair movement: The lone pair on the oxygen atom of OH2 will attack the electron-deficient oxygen atom in [CH3O(CH3)2]+.
Use curved arrows to show the movement of electron pairs: Draw a curved arrow from the lone pair on the oxygen of OH2 to the oxygen atom in [CH3O(CH3)2]+, indicating the formation of a new bond.
Analyze the products: The reaction results in the formation of O(CH3)2 and [CH3OH2]+. The O(CH3)2 is neutral, and [CH3OH2]+ is a positively charged species, indicating the transfer of a proton.
Conclude the reaction mechanism: The reaction involves the transfer of a proton from the Lewis acid to the Lewis base, resulting in the formation of a new bond and the products O(CH3)2 and [CH3OH2]+.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Lewis Acids and Bases
Lewis acids are species that can accept an electron pair, while Lewis bases are species that can donate an electron pair. In the context of acid-base reactions, identifying which reactant acts as a Lewis acid or base is crucial for understanding the reaction mechanism and predicting the products formed.
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02:49
The Lewis definition of acids and bases.
Curved Arrows in Mechanisms
Curved arrows are used in organic chemistry to illustrate the movement of electron pairs during chemical reactions. The tail of the arrow indicates the source of the electron pair (the nucleophile), while the head points to the atom that will receive the electrons (the electrophile). This notation helps visualize the flow of electrons and the changes in bonding that occur during the reaction.
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04:32General Mechanism
Radical Species
Radical species are atoms or molecules that contain unpaired electrons, making them highly reactive. In the provided reaction, the presence of radicals (indicated by dots) suggests that the reaction involves radical intermediates, which can significantly influence the reaction pathway and the stability of the products formed.
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Related Practice
Textbook Question
Methyllithium (CH3Li) is often used as a base in organic reactions.
b. What is the conjugate acid of CH3Li? Would you expect CH3Li to be a strong base or a weak base?
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Textbook Question
Label the reactants in these acid–base reactions as Lewis acids (electrophiles) or Lewis bases (nucleophiles). Use curved arrows to show the movement of electron pairs in the reactions.
(d)
1867
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Textbook Question
Label the reactants in these acid–base reactions as Lewis acids (electrophiles) or Lewis bases (nucleophiles). Use curved arrows to show the movement of electron pairs in the reactions.
i.
942
views
Textbook Question
Label the reactants in these acid–base reactions as Lewis acids (electrophiles) or Lewis bases (nucleophiles). Use curved arrows to show the movement of electron pairs in the reactions.
(c)
1568
views
Textbook Question
Label the reactants in these acid–base reactions as Lewis acids (electrophiles) or Lewis bases (nucleophiles). Use curved arrows to show the movement of electron pairs in the reactions.
(a)
1286
views