Textbook Question
Determine the structures of compounds A through G, including stereochemistry where appropriate.
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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 50
Many hunting dogs enjoy standing nose-to-nose with a skunk while barking furiously, oblivious to the skunk spray directed toward them. One moderately effective way of lessening the amount of odor is to wash the dog in a bath containing dilute hydrogen peroxide, sodium bicarbonate, and some mild dish detergent. Use chemical reactions to describe how this mixture helps to remove the skunk spray from the dog. The two major components of skunk oil are 3-methylbutane-1-thiol and but-2-ene-1-thiol.
Verified step by step guidance1
Step 1: Identify the functional groups in the skunk spray components. Both 3-methylbutane-1-thiol and but-2-ene-1-thiol contain thiol (-SH) groups, which are responsible for the strong odor due to their high volatility and reactivity.
Step 2: Understand the role of hydrogen peroxide (H₂O₂) in the reaction. Hydrogen peroxide acts as an oxidizing agent, capable of converting thiol groups (-SH) into disulfides (-S-S-) or sulfonic acids (-SO₃H), which are less volatile and less odorous.
Step 3: Sodium bicarbonate (NaHCO₃) serves as a mild base. It helps to neutralize any acidic byproducts formed during the oxidation process and maintains a suitable pH for the reaction to proceed efficiently.
Step 4: Mild dish detergent acts as a surfactant. It helps to emulsify the oily skunk spray components, allowing them to mix with water and be washed away more effectively.
Step 5: The overall reaction involves the oxidation of the thiol groups in the skunk spray components by hydrogen peroxide, facilitated by the detergent and bicarbonate. This reduces the odor and allows the compounds to be removed from the dog's fur during washing.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Thiol Chemistry
Thiols are organic compounds that contain a sulfhydryl group (-SH) and are known for their strong odors. The two major components of skunk spray, 3-methylbutane-1-thiol and 3-methylbut-2-ene-1-thiol, are examples of thiols. Their low molecular weight and high volatility contribute to their potent smell, making them difficult to neutralize without chemical reactions.
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The mechanism of Sulfide Synthesis.
Oxidation-Reduction Reactions
The mixture of hydrogen peroxide and sodium bicarbonate works through oxidation-reduction reactions. Hydrogen peroxide acts as an oxidizing agent, which can convert thiols into less odorous compounds. This process reduces the thiol groups, effectively neutralizing the strong odors associated with skunk spray.
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pH and Detergency
Sodium bicarbonate, a mild alkaline substance, helps to adjust the pH of the solution, enhancing the effectiveness of the detergent. The detergent aids in emulsifying and breaking down the oily components of skunk spray, allowing for easier removal from the dog's fur. This combination of pH adjustment and detergency is crucial for effectively cleaning the dog.
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Related Practice
Textbook Question
Propose structures for intermediates and products (A) through (D)
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Textbook Question
Compound A (C7H11Br) is treated with magnesium in ether to give B (C7H11MgBr), which reacts violently with D2O to give 1-methylcyclohexene with a deuterium atom on the methyl group (C). Reaction of B with acetone (CH3COCH3) followed by hydrolysis gives D (C10H18O). Heating D with concentrated H2SO4 gives E (C10H16), which decolorizes two equivalents of Br2 to give F (C10H16Br4). E undergoes hydrogenation with excess H2 and a Pt catalyst to give isobutylcyclohexane. Determine the structures of compounds A through F, and show your reasoning throughout.
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Textbook Question
Propose structures for intermediates and products (A) through (D).
801
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Textbook Question
Propose structures for intermediates and products (F) through (G)
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Textbook Question
Grignard reagents react slowly with oxetane to produce primary alcohols. Propose a mechanism for this reaction, and suggest why oxetane reacts with Grignard reagents even though most ethers do not.
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