Textbook Question
Complete the following acid–base reactions. In each case, indicate whether the equilibrium favors the reactants or the products, and explain your reasoning.
(e) (CH3)3C–O– + CH3CH2OH ⇌
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Ch.10 - Structure and Synthesis of Alcohols
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 10, Problem 41e
Show how you would synthesize the following:
e. cis-pent-2-en-1-thiol from a suitable alkenyl halide
Verified step by step guidance1
Step 1: Identify the target molecule, cis-pent-2-en-1-thiol, which contains a cis double bond and a thiol (-SH) group at the terminal position. This suggests that the starting material should be an alkenyl halide with a cis configuration.
Step 2: Choose a suitable alkenyl halide as the starting material. For this synthesis, cis-pent-2-enyl bromide or cis-pent-2-enyl chloride would be appropriate due to the cis double bond and halide functionality.
Step 3: Use a nucleophilic substitution reaction to replace the halide group with a thiol group (-SH). This can be achieved by treating the alkenyl halide with a nucleophile such as sodium hydrosulfide (NaSH) in a polar aprotic solvent like DMSO. The reaction mechanism involves the nucleophilic attack of the sulfur atom on the carbon bonded to the halide.
Step 4: Ensure that the reaction conditions preserve the cis configuration of the double bond. Avoid conditions that could lead to isomerization of the double bond, such as high temperatures or strong bases.
Step 5: Purify the product using techniques such as distillation or chromatography to isolate cis-pent-2-en-1-thiol. Confirm the structure and purity of the product using spectroscopic methods like NMR and IR.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alkenyl Halides
Alkenyl halides are organic compounds containing a carbon-carbon double bond (alkene) and a halogen atom. They are important intermediates in organic synthesis, as they can undergo various reactions, such as nucleophilic substitution and elimination, to form different functional groups. Understanding the reactivity of alkenyl halides is crucial for designing synthetic pathways.
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Nucleophilic Substitution Reactions
Nucleophilic substitution reactions involve the replacement of a leaving group (like a halogen) by a nucleophile. In the context of synthesizing thiols, a nucleophile such as a thiolate ion can attack the carbon atom bonded to the halogen, leading to the formation of a thiol. This concept is essential for understanding how to convert alkenyl halides into desired thiol products.
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Stereochemistry
Stereochemistry refers to the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the synthesis of cis-pent-2-en-1-thiol, it is important to consider the stereochemical configuration of the double bond and the resulting thiol. The cis configuration influences the physical properties and reactivity of the compound, making it a key factor in the synthesis process.
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Related Practice
Textbook Question
Show how you would synthesize the following:
c. cyclohexylmethanol from an alkyl halide using an SN2 reaction
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Textbook Question
Show how you would synthesize the following:
f. 2,5-dimethylhexane from a four-carbon alkyl halide
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Textbook Question
Complete the following acid–base reactions. In each case, indicate whether the equilibrium favors the reactants or the products, and explain your reasoning.
(d)
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Textbook Question
Show how you would accomplish the following transformations. You may use any additional reagents you need.
(d)
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Textbook Question
Show how you would synthesize the following:
a. 2-phenylethanol by the addition of formaldehyde to a suitable Grignard reagent
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