Domanda del libro di testo
Are the following substituents ortho–para directors or meta directors?
a. CH=CHC≡N
b. NO2
c. CH2OH
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Ch. 18 - Reactions of Benzene and Substituted Benzenes
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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TOC.tableOfContents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding31
- 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
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Bruice 8th EditionCh. 18 - Reactions of Benzene and Substituted BenzenesProblema 16a
Bruice 8th EditionCh. 18 - Reactions of Benzene and Substituted BenzenesProblema 16aCapitolo 18, Problema 16a
Draw the resonance contributors for:
a. benzaldehyde
Guida verificata passo dopo passo1
Step 1: Begin by identifying the structure of benzaldehyde. Benzaldehyde consists of a benzene ring (aromatic system) attached to a formyl group (-CHO). The benzene ring provides a conjugated π-electron system, which is key for resonance.
Step 2: Focus on the formyl group (-CHO). The carbonyl group (C=O) in the formyl group has a polarized bond due to the electronegativity difference between carbon and oxygen. Oxygen has a lone pair of electrons that can participate in resonance.
Step 3: Draw the first resonance contributor. In this structure, the π-electrons from the benzene ring remain localized, and the formyl group retains its double bond (C=O). This is the 'standard' structure of benzaldehyde.
Step 4: Draw the second resonance contributor. In this structure, the π-electrons from the benzene ring delocalize toward the carbonyl group. This results in a negative charge on the oxygen atom and a positive charge on the carbon atom of the formyl group. The benzene ring now has a formal positive charge on one of its carbons.
Step 5: Draw additional resonance contributors by shifting the π-electrons within the benzene ring. The delocalization of electrons can create multiple resonance structures where the formal charges move around the ring, maintaining aromaticity. Ensure all resonance contributors follow the rules of resonance (e.g., conserving the total number of electrons and maintaining the aromaticity of the benzene ring).
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Resonance Structures
Resonance structures are different Lewis structures for a molecule that depict the same arrangement of atoms but differ in the distribution of electrons. These structures help illustrate the delocalization of electrons within a molecule, which is particularly important in understanding the stability and reactivity of compounds like benzaldehyde.
Video consigliato:
03:04
Drawing Resonance Structures
Benzaldehyde Structure
Benzaldehyde is an aromatic compound consisting of a benzene ring attached to a formyl group (-CHO). The presence of the carbonyl group introduces a site of reactivity and influences the resonance contributors, as the double bond between carbon and oxygen can participate in resonance with the π electrons of the benzene ring.
Video consigliato:
03:04Drawing Resonance Structures
Aromaticity
Aromaticity refers to the enhanced stability of cyclic compounds with conjugated pi electron systems that follow Hückel's rule (4n + 2 π electrons). In benzaldehyde, the aromatic nature of the benzene ring allows for resonance stabilization, which is crucial for understanding the electronic properties and reactivity of the molecule.
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08:19Intro to Aromaticity
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