Domanda del libro di testo
A carboxylic acid ( pKa = 5) is 1011 times more acidic than an alcohol (pKa = 16). Why?
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Ch. 24 - Benzene 2: Reactions Influenced by the Aromatic Ring
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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TOC.tableOfContents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases/Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes 1: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes 2: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification 1: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification 2: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution 1: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution 2: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems 2: Pericyclic Reactions54
- Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene 2: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
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Mullins 1st EditionCh. 24 - Benzene 2: Reactions Influenced by the Aromatic RingProblema 2
Mullins 1st EditionCh. 24 - Benzene 2: Reactions Influenced by the Aromatic RingProblema 2Capitolo 23, Problema 2
What reagent would you use to brominate the allylic carbon of cyclohexene?
Guida verificata passo dopo passo1
Identify the allylic position in cyclohexene. The allylic position is the carbon atom adjacent to the double bond. In cyclohexene, this would be the carbon atoms next to the double bond in the ring structure.
Understand the concept of allylic bromination. Allylic bromination involves the substitution of a hydrogen atom at the allylic position with a bromine atom.
Consider the reagents typically used for allylic bromination. N-bromosuccinimide (NBS) is a common reagent used for this purpose because it selectively brominates the allylic position without affecting the double bond.
Recognize the role of NBS in the presence of a radical initiator. NBS works effectively in the presence of a radical initiator, such as light or heat, which helps generate bromine radicals necessary for the reaction.
Conclude that N-bromosuccinimide (NBS) in the presence of a radical initiator is the appropriate reagent for brominating the allylic carbon of cyclohexene.
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Allylic Bromination
Allylic bromination is a chemical reaction that involves the substitution of a hydrogen atom at the allylic position (the carbon atom adjacent to a double bond) with a bromine atom. This reaction is typically facilitated by radical mechanisms, making it selective for the allylic position due to the stability of the resulting allylic radical.
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00:54
Mechanism of Allylic Bromination.
Radical Mechanism
Radical mechanisms involve the formation and reaction of radicals, which are highly reactive species with unpaired electrons. In allylic bromination, radicals are generated by the homolytic cleavage of bonds, often initiated by heat or light, leading to the selective bromination of allylic positions due to the stability of allylic radicals.
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03:28The mechanism of Radical Polymerization.
N-Bromosuccinimide (NBS)
N-Bromosuccinimide (NBS) is a reagent commonly used for allylic bromination. It provides a controlled source of bromine radicals, facilitating the selective bromination of allylic positions in alkenes like cyclohexene. NBS is preferred due to its ability to generate bromine radicals under mild conditions, minimizing side reactions and ensuring high selectivity.
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Percorso guidato
3:06Synthesis of Amino Acids: N-Phthalimidomalonic Ester Synthesis Concept 1
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