Textbook Question
Predict the major products of the following reactions.
(a) (E)-3-methyloct-3-ene + ozone, then (CH3)2S
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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 36c
Give structures of the alkenes that would give the following products upon ozonolysis–reduction.
(c) 
Verified step by step guidance1
Step 1: Understand the ozonolysis reaction. Ozonolysis is a reaction where an alkene is cleaved by ozone (O₃), resulting in the formation of carbonyl compounds (aldehydes or ketones). The products depend on the structure of the original alkene.
Step 2: Analyze the given products. The first product is CH₃CH₂C(O)CH₂CH₂CH₂CH₃ (a ketone), and the second product is CH₃CH₂C(O)H (an aldehyde). These products suggest that the original alkene was cleaved at the double bond, forming these two fragments.
Step 3: Determine the connectivity of the original alkene. To reverse-engineer the alkene, connect the carbon atoms from the two products at the positions where the double bond would have been. For the ketone (CH₃CH₂C(O)CH₂CH₂CH₂CH₃), the carbonyl group indicates the cleavage point, and for the aldehyde (CH₃CH₂C(O)H), the carbonyl group also indicates the cleavage point.
Step 4: Combine the fragments. The original alkene must have had a double bond between the carbon atoms that correspond to the cleavage points in the products. Connect the two fragments (CH₃CH₂C and CH₂CH₂CH₂CH₃) to form the alkene structure.
Step 5: Verify the structure. Ensure that the reconstructed alkene matches the products formed during ozonolysis. The final structure should be consistent with the cleavage points and the carbonyl groups in the products.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Ozonolysis
Ozonolysis is a reaction involving the cleavage of alkenes using ozone (O3) to form carbonyl compounds, such as aldehydes and ketones. The process typically occurs in two steps: first, the alkene reacts with ozone to form a molozonide, which rearranges to form ozonides. These ozonides are then reduced, often using zinc and acetic acid or dimethyl sulfide, yielding the final carbonyl products.
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General properties of ozonolysis.
Alkenes
Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C=C). They are unsaturated compounds and can undergo various reactions, including addition and elimination reactions. The position and substitution of the double bond in alkenes significantly influence their reactivity and the types of products formed during reactions like ozonolysis.
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Reduction of Ozonolysis Products
The reduction step following ozonolysis is crucial for converting the ozonide intermediates into stable carbonyl compounds. Common reducing agents include zinc in acetic acid or dimethyl sulfide, which facilitate the transformation of the ozonides into aldehydes or ketones. Understanding the nature of these products is essential for predicting the structures of the original alkenes that would yield specific carbonyl compounds upon ozonolysis.
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Related Practice
Textbook Question
Give structures of the alkenes that would give the following products upon ozonolysis–reduction.
(a)
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Textbook Question
Predict the major products of the following reactions.
(b) (Z)-3-methyloct-3-ene + warm, concentrated KMnO4
1447
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Textbook Question
Predict the major products of the following reactions.
(c)
(d) 1-ethylcycloheptene + ozone, then (CH3)2S
1047
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Textbook Question
Give structures of the alkenes that would give the following products upon ozonolysis–reduction.
(b)
1680
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Textbook Question
Show how you would accomplish the following conversions.
d. trans-hex-3-ene to (d,l)-hexane-3,4-diol
990
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