Domanda del libro di testo
Lawsone, found in the extract of henna, reacts with amino acid residues to give the characteristic color associated with henna tattoos. Suggest a mechanism for the reaction shown.
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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
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Non è quello che usi tu?Cambia libro di testo
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Mullins 1st EditionCh. 24 - Benzene 2: Reactions Influenced by the Aromatic RingProblema 65
Mullins 1st EditionCh. 24 - Benzene 2: Reactions Influenced by the Aromatic RingProblema 65Capitolo 23, Problema 65
Phenol is synthesized from cumene via the scheme shown. Suggest the mechanism for each step of the reaction shown. [The oxygens have been screened in blue and orange to assist you.]
Guida verificata passo dopo passo1
The first step involves the formation of a cumene radical. This is initiated by an initiator, which abstracts a hydrogen atom from the methyl group of cumene, resulting in a radical on the benzylic carbon.
In the second step, the cumene radical reacts with molecular oxygen (O₂) to form a cumene hydroperoxide radical. This occurs through a radical chain mechanism where the radical on the benzylic carbon reacts with O₂ to form a peroxy radical.
The cumene hydroperoxide radical then abstracts a hydrogen atom from another cumene molecule, forming cumene hydroperoxide and regenerating the cumene radical, which can propagate the chain reaction.
In the presence of an acid catalyst (H₃O⁺), the cumene hydroperoxide undergoes acid-catalyzed rearrangement. The oxygen of the hydroperoxide group is protonated, making it a better leaving group, and the bond between the oxygen and the benzylic carbon breaks, forming a carbocation.
The carbocation undergoes a rearrangement to form a more stable phenyl cation, which then reacts with water to form phenol and acetone as the final products. The water molecule attacks the carbocation, leading to the formation of phenol, while the leaving group forms acetone.
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Electrophilic Aromatic Substitution
Electrophilic aromatic substitution (EAS) is a fundamental reaction in organic chemistry where an electrophile replaces a hydrogen atom on an aromatic ring. This process is crucial for understanding how phenol is synthesized from cumene, as it involves the introduction of functional groups onto the aromatic system, enhancing its reactivity and leading to the formation of phenolic compounds.
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EAS Review
Radical Mechanisms
Radical mechanisms involve reactions that proceed through the formation of free radicals, which are highly reactive species with unpaired electrons. In the synthesis of phenol from cumene, radical intermediates play a key role, particularly in the oxidation steps where cumene is converted to cumene hydroperoxide, ultimately leading to phenol and acetone.
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Hydrolysis of Peroxides
Hydrolysis of peroxides is a reaction where peroxides are converted into alcohols and other products in the presence of water. In the context of phenol synthesis, the hydrolysis of cumene hydroperoxide is a critical step that leads to the formation of phenol and acetone, illustrating the importance of water in facilitating the breakdown of peroxide intermediates.
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1:00Hydrolysis of Thioesters Concept 2
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