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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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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...
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The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.
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Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Diazonium Group Substitution: –OH and –H01:19

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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.
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

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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...
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

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

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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.
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Imidazolidinyl Urea.

Christina Burnett1, Wilma F Bergfeld2, Donald V Belsito2

  • 1Cosmetic Ingredient Review Senior Scientific Analyst/Writer, Washington, DC, USA.

International Journal of Toxicology
|September 30, 2023
PubMed
Summary
This summary is machine-generated.

The Expert Panel for Cosmetic Ingredient Safety reaffirmed that Imidazolidinyl Urea is safe for cosmetic use. Updated reviews confirm its safety in current product types, frequencies, and concentrations.

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Area of Science:

  • Cosmetic Science
  • Toxicology
  • Dermatology

Background:

  • Imidazolidinyl Urea has been previously assessed for safety in cosmetic products.
  • New data on product types, usage frequency, and concentrations have become available.

Purpose of the Study:

  • To review updated safety information on Imidazolidinyl Urea.
  • To reassess the safety of Imidazolidinyl Urea in contemporary cosmetic applications.

Main Methods:

  • Expert Panel review of updated scientific literature.
  • Analysis of current cosmetic product formulations and usage patterns.

Main Results:

  • Updated information was considered since the original 1980 assessment.
  • The ingredient's safety was evaluated based on current use practices.

Conclusions:

  • Imidazolidinyl Urea is safe as a cosmetic ingredient.
  • Safety is confirmed for the described practices of use and concentration.