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Related Concept Videos

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.1K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
3.1K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

2.9K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
2.9K
2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

4.6K
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.
4.6K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

2.2K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.2K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

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

4.0K
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.
4.0K
Teratogenicity01:07

Teratogenicity

2.8K
The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
2.8K

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Zebrafish as a Model to Assess the Teratogenic Potential of Nitrite
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Nitazenes: An Old Drug Class Causing New Problems.

Evan S Schwarz1, Frank Dicker2, Emilie Lothet2

  • 1Division of Medical Toxicology, Department of Emergency Medicine, University of California, Los Angeles, California, USA.

Missouri Medicine
|August 11, 2025
PubMed
Summary
This summary is machine-generated.

Novel synthetic opioids called nitazenes are potent and cause overdose deaths. Naloxone can reverse nitazene effects, highlighting the need for better addiction care and naloxone access to prevent opioid-related harm.

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Area of Science:

  • Pharmacology
  • Toxicology
  • Public Health

Background:

  • Illicit opioid supplies are increasingly contaminated with novel synthetic opioids, notably nitazenes.
  • Nitazenes represent a growing threat due to their high potency and association with fatal overdoses.
  • These substances pose a significant public health challenge, necessitating urgent intervention strategies.

Purpose of the Study:

  • To highlight the increasing prevalence and danger of nitazenes in the illicit drug supply.
  • To emphasize the effectiveness of naloxone in reversing nitazene-induced opioid overdoses.
  • To advocate for enhanced addiction treatment and wider naloxone distribution to mitigate overdose risks.

Main Methods:

  • Review of current literature on novel synthetic opioids, focusing on nitazenes.
  • Analysis of overdose data trends associated with nitazene adulteration.
  • Assessment of naloxone's efficacy in clinical and emergency settings.

Main Results:

  • Nitazenes are potent synthetic opioids frequently found in the illicit drug supply.
  • Overdoses and fatalities are increasingly linked to nitazene exposure.
  • Naloxone effectively reverses the effects of nitazenes, similar to other opioids.

Conclusions:

  • Despite their extreme potency, nitazenes remain susceptible to naloxone reversal.
  • Urgent improvements in addiction care delivery and naloxone accessibility are critical.
  • Public health strategies must adapt to address the evolving threat of novel synthetic opioids like nitazenes to reduce mortality.