Textbook Question
Propose structures for intermediates and products (A) through (D)
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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 49
Determine the structures of compounds A through G, including stereochemistry where appropriate.
Verified step by step guidance1
Step 1: Analyze the first reaction. The starting material is cyclohexene, which reacts with perbenzoic acid (PhCO3H). This is an epoxidation reaction, where the double bond in cyclohexene reacts with the peracid to form an epoxide. Compound A is cyclohexene oxide.
Step 2: Examine the second reaction. Compound A (cyclohexene oxide) reacts with methylmagnesium bromide (CH3MgBr), a Grignard reagent, followed by acid workup (H3O+). The Grignard reagent attacks the less sterically hindered carbon of the epoxide, opening the ring and forming an alcohol. Compound B is 1-methylcyclohexanol.
Step 3: Consider the third reaction. Compound B (1-methylcyclohexanol) undergoes dehydration in the presence of concentrated sulfuric acid (H2SO4) and heat (Δ). This elimination reaction removes water to form an alkene. Compound C is 1-methylcyclohexene.
Step 4: Analyze the final reaction. Compound C (1-methylcyclohexene) undergoes catalytic hydrogenation in the presence of hydrogen gas (H2) and platinum (Pt). This reaction reduces the double bond in the alkene to form a saturated hydrocarbon. The final product is methylcyclohexane.
Step 5: Ensure stereochemistry is considered where appropriate. In this sequence, stereochemistry is relevant during the epoxide opening and Grignard addition, as the attack occurs at the less hindered side of the epoxide. The final product, methylcyclohexane, does not have stereochemical concerns as it is a symmetric saturated hydrocarbon.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Grignard Reagents
Grignard reagents are organomagnesium compounds that react with electrophiles to form carbon-carbon bonds. In this reaction scheme, CH3MgBr acts as a nucleophile, attacking the electrophilic carbon of the carbonyl group in compound A, leading to the formation of a tertiary alcohol in compound B.
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Carbonation of Grignard Reagents
Acid-Catalyzed Reactions
Acid-catalyzed reactions involve the use of an acid to facilitate the conversion of reactants into products. In this case, sulfuric acid (H2SO4) is used to promote the dehydration of the alcohol in compound B to form an alkene in compound C, highlighting the importance of acid in organic transformations.
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Stereochemistry
Stereochemistry refers to the spatial arrangement of atoms in molecules and the impact of this arrangement on chemical properties and reactions. Understanding stereochemistry is crucial for determining the correct structure of compounds A through G, especially when dealing with chiral centers or geometric isomers that may arise during the synthesis.
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Related Practice
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
Vinyl alcohols are generally unstable, quickly isomerizing to carbonyl compounds. Propose mechanisms for the following isomerizations.
(c)
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Textbook Question
Propose structures for intermediates and products (A) through (D).
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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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Textbook Question
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.
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