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 47i
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
Verified step by step guidance1
Step 1: Analyze the structure of limonene. Limonene is a cyclic terpene with two double bonds: one in the ring and one in the side chain. These double bonds are reactive sites for electrophilic addition reactions.
Step 2: Understand the reaction conditions. Hydrogen bromide (HBr) in the presence of dimethyl peroxide introduces a radical mechanism instead of the typical electrophilic addition. This is due to the peroxide effect (anti-Markovnikov addition).
Step 3: Initiate the radical mechanism. The peroxide decomposes to form radicals, which then react with HBr to generate a bromine radical. This bromine radical will attack the double bonds in limonene.
Step 4: Predict the product formation. The bromine radical will add to the less substituted carbon of the double bond (anti-Markovnikov rule). This process will occur for both double bonds in limonene, leading to brominated products.
Step 5: Draw the expected products. The first double bond in the ring will react to form a brominated cyclic structure, and the second double bond in the side chain will react similarly. The final products will be dibrominated derivatives of limonene.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Limonene Structure and Properties
Limonene is a cyclic monoterpene with a distinctive structure characterized by a six-membered ring and a double bond. It is known for its citrus aroma and is commonly found in the peels of citrus fruits. Understanding its structure is crucial for predicting its reactivity with various reagents, as the presence of double bonds makes it susceptible to electrophilic addition reactions.
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Electrophilic Addition Reactions
Electrophilic addition reactions involve the addition of an electrophile to a nucleophile, typically across a double bond. In the case of limonene reacting with hydrogen bromide, the double bond acts as a nucleophile, attacking the electrophilic hydrogen, leading to the formation of a bromide product. This concept is essential for predicting the products formed when limonene interacts with different reagents.
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Role of Dimethyl Peroxide
Dimethyl peroxide is often used as a radical initiator in organic reactions, particularly in the presence of electrophiles. When limonene reacts with hydrogen bromide in the presence of dimethyl peroxide, it can lead to a radical mechanism that alters the expected product distribution. Understanding how dimethyl peroxide influences the reaction pathway is key to predicting the final products of the reaction.
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