Textbook Question
Propose a mechanism for the synthesis of methyl orange.
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Ch. 19 - Amines
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 19, Problem 23c
Predict the products from the reactions of the following amines with sodium nitrite in dilute HCl.
(c) piperidine
Verified step by step guidance1
Understand the reaction: Sodium nitrite (NaNO₂) in dilute HCl generates nitrous acid (HNO₂) in situ. This reagent reacts with amines to form different products depending on the type of amine (primary, secondary, or tertiary). Piperidine is a secondary amine, so it will undergo nitrosation to form an N-nitrosoamine.
Write the structure of piperidine: Piperidine is a six-membered saturated heterocyclic ring containing one nitrogen atom. Its molecular formula is C₅H₁₁N, and the nitrogen atom has a lone pair of electrons, making it nucleophilic.
Describe the reaction mechanism: The lone pair on the nitrogen atom of piperidine attacks the nitrosonium ion (NO⁺), which is generated from the reaction of nitrous acid (HNO₂) with HCl. This leads to the formation of an N-nitrosoamine.
Draw the product: The product of the reaction is N-nitrosopiperidine, where the nitrogen atom in piperidine is bonded to a nitroso group (-NO). The structure of N-nitrosopiperidine can be represented as a six-membered ring with the nitrogen atom attached to the -NO group.
Verify the reaction conditions: Ensure that the reaction is carried out under acidic conditions (dilute HCl) and at a low temperature, as nitrosation reactions are typically sensitive to these parameters.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Amines
Amines are organic compounds derived from ammonia (NH3) by replacing one or more hydrogen atoms with alkyl or aryl groups. They can be classified as primary, secondary, or tertiary based on the number of carbon-containing groups attached to the nitrogen atom. Understanding the structure and reactivity of amines is crucial for predicting their behavior in chemical reactions.
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Reductive Amination
Diazotization
Diazotization is a chemical reaction that involves the conversion of primary amines into diazonium salts using sodium nitrite (NaNO2) in the presence of a strong acid, such as hydrochloric acid (HCl). This process is essential for synthesizing various aromatic compounds and is characterized by the formation of a stable diazonium ion, which can undergo further reactions to yield different products.
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Piperidine Reactivity
Piperidine is a six-membered saturated heterocyclic amine with a nitrogen atom in the ring. Unlike primary amines, piperidine is a secondary amine, which influences its reactivity during diazotization. Understanding how piperidine interacts with sodium nitrite and HCl is key to predicting the products formed, as it may lead to different outcomes compared to simpler amines.
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Related Practice
Textbook Question
Show how you would convert aniline to the following compounds.
(a) fluorobenzene
(b) chlorobenzene
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Textbook Question
Predict the products from the reactions of the following amines with sodium nitrite in dilute HCl.
(b) N-ethylhexan-2-amine
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Textbook Question
Predict the products from the reactions of the following amines with sodium nitrite in dilute HCl.
(d) aniline
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Textbook Question
When the (R,R) isomer of the amine shown is treated with an excess of methyl iodide, then silver oxide, then heated, the major product is the Hofmann product.
(b) Some Zaitsev product is also formed. It has the (E) configuration. When the same amine is treated with mCPBA and heated, the Zaitsev product has the (Z) configuration. Use stereochemical drawings of the transition states to explain these observations.
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Textbook Question
When the (R,R) isomer of the amine shown is treated with an excess of methyl iodide, then silver oxide, then heated, the major product is the Hofmann product.
(a) Draw the structure of the major (Hofmann) product.
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