Textbook Question
Calculate the oxidation number for the indicated carbons.
(b)
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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 40c
Identify the alkene that would react with Ti(OiPr)₄, (+) -diethyltartrate, and t-butylhydroperoxide to give the following chiral, nonracemic epoxides.
(c) 
Verified step by step guidance1
Recognize that the reagents Ti(OiPr)₄, (+)-diethyltartrate, and t-butylhydroperoxide are used in the Sharpless epoxidation, which is a method for the enantioselective epoxidation of allylic alcohols.
Identify the structure of the given epoxide. The epoxide shown has a chiral center and is nonracemic, indicating that it was formed through an enantioselective process.
Determine the configuration of the chiral center in the epoxide. The stereochemistry of the epoxide will be determined by the chirality of the starting allylic alcohol and the enantioselectivity of the Sharpless epoxidation.
Consider the structure of the starting alkene. The starting alkene should be an allylic alcohol, which means it should have a hydroxyl group (OH) adjacent to the double bond.
Propose the structure of the alkene that would lead to the given epoxide. The alkene should have the same carbon skeleton as the epoxide, with the double bond positioned such that the hydroxyl group is allylic to it.
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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 substitution pattern of the alkene is crucial for predicting its reactivity with reagents like Ti(OiPr)₄ and t-butylhydroperoxide.
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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 oxidizing agents, including peroxides. The stereochemistry of the epoxide formed is influenced by the substituents on the alkene and the specific conditions of the reaction, which is essential for producing chiral, nonracemic products.
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02:19General properties of epoxidation.
Chirality and Nonracemic Mixtures
Chirality refers to the property of a molecule that makes it non-superimposable on its mirror image, leading to the existence of enantiomers. Nonracemic mixtures contain an unequal proportion of these enantiomers, resulting in optical activity. In the context of the question, understanding how the reaction conditions and starting materials influence chirality is vital for predicting the outcome of the epoxidation process.
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05:10What is chirality?
Related Practice
Textbook Question
Calculate the oxidation number for the indicated carbons.
(a)
1412
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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.
1434
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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.
(a)
861
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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?
983
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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)
585
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