Textbook Question
When 1,2-dimethylcyclopentene undergoes hydroboration–oxidation, one diastereomer of the product predominates. Show why this addition is stereospecific, and predict the stereochemistry of the major product.
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Ch.8 - Reactions of Alkenes
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 8, Problem 15b
Show how you would accomplish the following transformations.
(b) 
Verified step by step guidance1
Analyze the starting material: The structure is a bicyclic compound with a double bond in one of the rings. This suggests that the reaction will involve the addition of a functional group to the double bond.
Determine the target molecule: The product is a bicyclic compound with an alcohol (-OH) group added to the ring system. This indicates that the reaction involves a hydration process.
Select the appropriate reaction: To add an -OH group to the double bond, use an acid-catalyzed hydration reaction. This typically involves using water (H₂O) in the presence of a strong acid, such as H₂SO₄, to protonate the double bond and form a carbocation intermediate.
Consider regioselectivity: The Markovnikov rule applies here, meaning the -OH group will add to the more substituted carbon of the double bond, as this stabilizes the carbocation intermediate.
Propose the mechanism: (1) Protonate the double bond using H⁺ to form a carbocation intermediate. (2) Add water (H₂O) to the carbocation to form an oxonium ion. (3) Deprotonate the oxonium ion to yield the final alcohol product.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleophilic Addition
Nucleophilic addition is a fundamental reaction mechanism in organic chemistry where a nucleophile attacks an electrophilic carbon atom, leading to the formation of a new bond. In the context of the transformation shown, a nucleophile, such as water or an alcohol, can add to a double bond or a carbonyl group, resulting in the formation of an alcohol. Understanding this mechanism is crucial for predicting the products of reactions involving unsaturated compounds.
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Nucleophilic Addition
Stereochemistry
Stereochemistry refers to the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the transformation depicted, the stereochemistry of the starting material can influence the outcome of the reaction, particularly if the reaction involves chiral centers. Recognizing the stereochemical implications is essential for determining the correct product and understanding the reaction pathway.
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Functional Group Transformation
Functional group transformation involves the conversion of one functional group into another through chemical reactions. In the given transformation, a double bond in a bicyclic compound is converted into an alcohol functional group. Mastery of functional group transformations is vital for organic synthesis, as it allows chemists to manipulate molecules to achieve desired properties and reactivity.
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Related Practice
Textbook Question
When (E)-3-methylhex-3-ene undergoes hydroboration–oxidation, two isomeric products are formed. Give their structures, and label each asymmetric carbon atom as (R) or (S). What is the relationship between these isomers? What is the relationship between the products formed from (Z)-3-methylhex-3-ene and those formed from (E)-3-methylhex-3-ene?
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Textbook Question
When HBr adds across the double bond of 1,2-dimethylcyclopentene, the product is a mixture of the cis and trans isomers. Show why this addition is not stereospecific.
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Textbook Question
Show how you would accomplish the following transformations.
(a)
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Textbook Question
Show how you would accomplish the following transformations.
(c) 1-methylcycloheptanol → 2-methylcycloheptanol
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Textbook Question
When (Z)-3-methylhex-3-ene undergoes hydroboration–oxidation, two isomeric products are formed. Give their structures, and label each asymmetric carbon atom as (R) or (S). What is the relationship between these isomers?
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