Domanda del libro di testo
Benzyl ethers make excellent protecting groups according to the general scheme shown here.
(a) How would you protect the 1° alcohol as a benzyl ether in the first step?
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Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination
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. 13 - Alcohols, Ethers and Related Compounds: Substitution and EliminationProblema 112
Mullins 1st EditionCh. 13 - Alcohols, Ethers and Related Compounds: Substitution and EliminationProblema 112Capitolo 12, Problema 112
In Chapter 12, we learned that crown ethers were used to increase the rate of SN2 reactions (Assessment 12.80). Suggest a synthesis of 15-crown-5 using the reactions learned here in Chapter 13.
Guida verificata passo dopo passo1
Identify the structure of 15-crown-5, which consists of a cyclic ether with five ethylene oxide units. This means it has five oxygen atoms and a total of 15 atoms in the ring.
To synthesize 15-crown-5, start with ethylene glycol as the base unit. Ethylene glycol can be converted into ethylene oxide, which is a key building block for crown ethers.
Use a Williamson ether synthesis to link the ethylene oxide units. This involves deprotonating the hydroxyl group of ethylene glycol to form an alkoxide ion, which can then attack an ethylene oxide molecule to form an ether linkage.
Repeat the ether formation process to build the chain of ethylene oxide units. This step is crucial to form the linear precursor that will eventually be cyclized into the crown ether.
Finally, cyclize the linear polyether chain to form the cyclic structure of 15-crown-5. This can be achieved by using a suitable base to deprotonate the terminal hydroxyl group, allowing it to attack the other end of the chain and close the ring.
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Crown Ethers
Crown ethers are cyclic compounds that contain multiple ether groups, which can selectively bind cations due to their unique size and shape. The number in their name indicates the number of atoms in the ring, and their ability to form complexes with metal ions enhances solubility and reactivity in organic reactions, particularly in S_N2 mechanisms.
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How to predict the products of Ether Cleavage.
S_N2 Reactions
S_N2 (substitution nucleophilic bimolecular) reactions involve a nucleophile attacking an electrophile, resulting in the simultaneous displacement of a leaving group. This mechanism is characterized by a single concerted step, where the reaction rate depends on the concentration of both the nucleophile and the substrate, making it sensitive to steric hindrance.
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05:09Heck Reaction
Synthetic Pathways
Synthetic pathways refer to the series of chemical reactions and transformations used to construct a target molecule from simpler precursors. Understanding the functional groups, reaction conditions, and mechanisms involved is crucial for designing efficient syntheses, such as that of 15-crown-5, which may involve alkylation and etherification reactions.
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Percorso guidato
2:13Energy Production In Biochemical Pathways Concept 1
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Another method for converting alcohols to chloroalkanes makes use of chlorotrimethylsilane (TMSCl) and DMSO. Suggest a mechanism for this reaction to form (a) a 1° chloroalkane and (b) a 3° chloroalkane. [The reaction begins by the reaction of DMSO and TMSCl and is analogous to the Swern oxidation.]
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We explain in Chapter 24 that bisphenols can be oxidized to quinones.
(a) Calculate the oxidation numbers of C1 and C₂ in going from reactant to product.
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