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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO₂ Overview

Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...

2° Amines to N-Nitrosamines: Reaction with NaNO2

2° Amines to N-Nitrosamines: Reaction with NaNO₂

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.

Electrophilic Aromatic Substitution: Nitration of Benzene

Electrophilic Aromatic Substitution: Nitration of Benzene

The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO₂ Mechanism

Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.

meta-Directing Deactivators: –NO2, –CN, –CHO, –&NoBreak;CO2R, –COR, –CO2H

meta-Directing Deactivators: –NO₂, –CN, –CHO, –⁠CO₂R, –COR, –CO₂H

All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for the...

Preparation of Amines: Reduction of Oximes and Nitro Compounds

Preparation of Amines: Reduction of Oximes and Nitro Compounds

Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...

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Aromatic nitration in liquid Ag0.51K0.42Na0.07NO3.

Mark Mascal¹, Lunxiang Yin, Ross Edwards

¹Department of Chemistry, University of California Davis, 1 Shields Avenue, Davis, California 95616, USA. mascal@chem.ucdavis.edu

The Journal of Organic Chemistry

|July 12, 2008

Summary

Aromatic molecules dissolve in a silver nitrate-based ionic liquid. Nitration reactions in this medium proceed via unusual, non-electrophilic pathways, yielding novel products.

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Area of Science:

Inorganic chemistry
Organic chemistry
Materials science

Background:

Aromatic molecules exhibit strong interactions with silver(I) ions.
Low-melting nitrate salts offer unique solvent properties for chemical reactions.

Purpose of the Study:

To investigate the nitration of aromatic molecules in a novel silver-based inorganic ionic liquid.
To explore the reaction mechanisms and product distribution in this unique reaction medium.

Main Methods:

Dissolving aromatic molecules in a silver, potassium, and sodium nitrate eutectic mixture (Ag0.51K0.42Na0.07NO3).
Performing aromatic nitration reactions within this ionic liquid solvent.
Analyzing reaction products to determine substitution pathways.

Main Results:

Aromatic molecules showed limited solubility in the Ag-K-Na nitrate ionic liquid.
Nitration reactions occurred, producing compounds not typically formed through electrophilic substitution.
Evidence suggests non-electrophilic substitution mechanisms are dominant.

Conclusions:

The Ag-K-Na nitrate ionic liquid serves as a viable medium for aromatic nitration.
Nitration in this system proceeds via unconventional, non-electrophilic pathways.
This ionic liquid system offers a new route for synthesizing unique aromatic compounds.