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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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 50i
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. 
Verified step by step guidance1
Identify the Lewis acid and Lewis base: In the given reaction, BF₃ is a Lewis acid because it can accept an electron pair, and CH₂=CH₂ is a Lewis base because it can donate an electron pair.
Recognize the electrophile and nucleophile: The Lewis acid (BF₃) acts as an electrophile, and the Lewis base (CH₂=CH₂) acts as a nucleophile.
Draw the curved arrow: Use a curved arrow to indicate the movement of electron pairs from the π bond of the alkene (CH₂=CH₂) to the electron-deficient carbon atom bonded to BF₃.
Understand the reaction mechanism: The electron pair from the alkene attacks the carbocation, forming a new bond between the alkene and the carbocation, resulting in the extended carbon chain.
Label the final structure: After the electron pair movement, the BF₃ group is attached to the extended carbon chain, and the positive charge is now on the terminal carbon atom of the chain.
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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 accept electron pairs, while Lewis bases donate electron pairs. In the given reaction, BF3 acts as a Lewis acid because it can accept electron pairs, and the alkene (CH2=CH2) acts as a Lewis base, donating electron pairs to form a bond with the carbocation.
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The Lewis definition of acids and bases.
Electrophiles and Nucleophiles
Electrophiles are electron-deficient species that seek electrons, while nucleophiles are electron-rich species that donate electrons. In the reaction, the carbocation (CH2+) is an electrophile, seeking electrons from the nucleophilic alkene (CH2=CH2), which donates electrons to form a new bond.
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03:Nucleophile or Electrophile
Curved Arrow Notation
Curved arrows are used in organic chemistry to depict the movement of electron pairs during reactions. In the image, curved arrows should show the electron pair from the alkene moving towards the carbocation, indicating the formation of a new bond and the electron flow from the nucleophile to the electrophile.
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Related Practice
Textbook Question
In each reaction, label the reactants as Lewis acids (electrophiles) or Lewis bases (nucleophiles). Use curved arrows to show the movement of electron pairs in the reactions. Draw any nonbonding electrons to show how they participate in the reactions.
(b)
1531
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.
(b)
1446
views
Textbook Question
In each reaction, label the reactants as Lewis acids (electrophiles) or Lewis bases (nucleophiles). Use curved arrows to show the movement of electron pairs in the reactions. Draw any nonbonding electrons to show how they participate in the reactions.
c.
750
views
Textbook Question
In each reaction, label the reactants as Lewis acids (electrophiles) or Lewis bases (nucleophiles). Use curved arrows to show the movement of electron pairs in the reactions. Draw any nonbonding electrons to show how they participate in the reactions.
(a)
1597
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