Textbook Question
Identify the alkene that would react with Ti(OiPr)₄, (+) -diethyltartrate, and t-butylhydroperoxide to give the following chiral, nonracemic epoxides.
(c)
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Ch. 9 - Alkenes II: Oxidation and Reduction
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- 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 I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: 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 I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: 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: 9780137566471Not the one you use?Change textbook
Chapter 8, Problem 40a
Identify the alkene that would react with Ti(OiPr)₄, (+) -diethyltartrate, and t-butylhydroperoxide to give the following chiral, nonracemic epoxides.
(a) 
Verified step by step guidance1
Understand the reaction: The Sharpless epoxidation is used to convert alkenes into epoxides using a chiral catalyst system. The reagents Ti(OiPr)₄, (+)-diethyltartrate, and t-butylhydroperoxide are part of this system.
Identify the stereochemistry: The product is a chiral, nonracemic epoxide, indicating that the reaction is stereoselective. The stereochemistry of the epoxide is determined by the chiral catalyst used.
Analyze the structure: The given epoxide has a specific stereochemistry at the epoxide ring. The stereochemistry of the starting alkene will influence the stereochemistry of the epoxide.
Determine the alkene structure: The alkene that would lead to the given epoxide must have a similar carbon skeleton. Look for the alkene that matches the carbon framework of the epoxide, excluding the oxygen atoms.
Consider the regioselectivity: The position of the double bond in the alkene will determine where the epoxide forms. Ensure the double bond is positioned correctly to form the epoxide at the desired location.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alkene Reactivity
Alkenes are hydrocarbons that contain at least one carbon-carbon double bond. Their reactivity is primarily due to the presence of this double bond, which can undergo various reactions, including electrophilic additions. Understanding the structure and stability of alkenes is crucial for predicting their behavior in reactions, especially when forming cyclic structures like epoxides.
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Alkene Metathesis Concept 1
Epoxidation
Epoxidation is a chemical reaction that converts alkenes into epoxides, which are three-membered cyclic ethers. This reaction can be facilitated by various reagents, including peracids and metal catalysts. The stereochemistry of the alkene and the conditions of the reaction can influence the configuration of the resulting epoxide, making it essential to consider these factors when predicting the product.
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02:19General properties of epoxidation.
Chirality and Nonracemic Products
Chirality refers to the property of a molecule that makes it non-superimposable on its mirror image, leading to the existence of enantiomers. Nonracemic products are those that do not have equal amounts of both enantiomers, resulting in optical activity. In the context of the question, understanding how the reaction conditions and starting materials influence chirality is vital for identifying the correct alkene that yields a specific chiral epoxide.
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05:10What is chirality?
Related Practice
Textbook Question
Conjugated dienes, molecules containing two alkenes separated by one single bond, are discussed in detail in Chapter 21.
(b) How might you account for this difference in stability?
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Textbook Question
The chiral catalyst (R)-BINAP(COD)RhOTf was used in a hydrogenation reaction as part of the synthesis of fragment C of indinavir. Using the same alkene, predict the product that would be obtained if (S)-BINAP(COD)RhOTf were used instead.
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Textbook Question
Questions (a)–(d) all refer to the following reaction, which has been engineered to produce one enantiomer to the exclusion of the other.
(c) Suppose the difference in activation energy is 1.6 kcal/mol. At what temperature would you produce C in 99% ee?
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Textbook Question
Identify the alkene that would react with Ti(OiPr)4, (+) -diethyltartrate, and t-butylhydroperoxide to give the following chiral, nonracemic epoxides.
(b)
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Textbook Question
Conjugated dienes, molecules containing two alkenes separated by one single bond, are discussed in detail in Chapter 21.
(a) Considering the observed ∆H° of hydrogenation, is hexa-1,3-diene (conjugated) or hexa-1,4-diene (unconjugated) more stable?
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