Textbook Question
Limonene is one of the compounds that give lemons their tangy odor. Show the structures of the products expected when limonene reacts with an excess of each of these reagents.
m. CHBr3 and 50% aq. NaOH
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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 48a,b
Give the products expected when the following compounds are ozonized and reduced.
(a) 
(b) 
Verified step by step guidance1
Step 1: Understand the reaction mechanism. Ozonolysis involves the cleavage of double bonds in alkenes using ozone (O₃), followed by reduction. The reduction step can be performed using agents like zinc and water or dimethyl sulfide (DMS). This process results in the formation of carbonyl compounds (aldehydes or ketones).
Step 2: Analyze compound (a). The structure shows a cyclic compound with one double bond. During ozonolysis, the double bond will be cleaved, and the resulting fragments will form carbonyl groups. Identify the positions of the double bond and predict the cleavage products.
Step 3: Analyze compound (b). The structure shows a branched alkene with one double bond. Ozonolysis will cleave the double bond, and the resulting fragments will form carbonyl groups. Determine the cleavage points and predict the products based on the substituents attached to the double bond.
Step 4: Write the general reaction for ozonolysis. Represent the cleavage of the double bond in each compound using the chemical equation: R₁-CH=CH-R₂ + O₃ → R₁-CHO + R₂-CHO (for aldehydes) or R₁-CO-R₂ (for ketones).
Step 5: Predict the products for each compound. For compound (a), the cyclic structure will yield two carbonyl compounds upon cleavage. For compound (b), the branched structure will yield specific aldehydes or ketones based on the substituents. Ensure the products match the original structure and substituents.
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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 or alkynes using ozone (O3) to form carbonyl compounds. The process typically occurs in two steps: first, the formation of a molozonide intermediate, followed by rearrangement to yield ozonides, which can be further reduced to aldehydes or ketones. Understanding this reaction is crucial for predicting the products of ozonization.
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General properties of ozonolysis.
Reduction of Ozonides
After ozonolysis, the ozonides formed can be reduced using a reducing agent, commonly zinc (Zn) and acetic acid or dimethyl sulfide (DMS). This reduction step converts the ozonides into stable carbonyl compounds, such as aldehydes or ketones. Recognizing the reducing agents and their roles is essential for determining the final products of the reaction.
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Functional Group Transformation
Functional group transformation refers to the conversion of one functional group into another during a chemical reaction. In ozonolysis, alkenes are transformed into carbonyl groups (aldehydes or ketones), which significantly alters the reactivity and properties of the original compound. Understanding these transformations is vital for predicting the outcomes of organic reactions.
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Related Practice
Textbook Question
Show how you would make the following compounds from a suitable cyclic alkene.
(b)
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Textbook Question
Limonene is one of the compounds that give lemons their tangy odor. Show the structures of the products expected when limonene reacts with an excess of each of these reagents.
f. peroxyacetic acid in acidic water
1
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Textbook Question
Give the products expected when the following compounds are ozonized and reduced.
(c)
(d)
1
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Textbook Question
Limonene is one of the compounds that give lemons their tangy odor. Show the structures of the products expected when limonene reacts with an excess of each of these reagents.
(i) hydrogen bromide gas in a solution containing dimethyl peroxide
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Textbook Question
Show how you would make the following compounds from a suitable cyclic alkene.
(a)
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