Imidazolidinyl urea

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Imidazolidinyl urea
Imidazolidinyl urea correct formula.png
Imidazolidinyl urea erroneous formula.png
Names
IUPAC names
Correct new structure (upper pic.):
1,1'-methylenebis{3-[4-(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl]urea}
Erroneous old structure (lower pic.):
1,1'-methylenebis{3-[1-(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl]urea}
Other names
Imidurea, Germall 115;

N',N''-methylenebis[3-[1-(hydroxymethyl)- 2,5-dioxoimidazolidin-4-yl]urea];

1-[1-(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl]- 3-[[[1-(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl] carbamoylamino]methyl]urea
Identifiers
39236-46-9 YesY=  YesY
ChEBI CHEBI:51805 YesY
ChEMBL ChEMBL65433 YesY
ChemSpider 35067 YesY
EC number 254-372-6
Jmol-3D images Image
Image
PubChem 38258
Properties
C11H16N8O8
Molar mass 388.29 g/mol
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY verify (what isYesY/N?)
Infobox references

Imidazolidinyl urea is an antimicrobial preservative used in cosmetics[citation needed]. It is chemically related to diazolidinyl urea which is used in the same way. Imidazolidinyl urea acts as a formaldehyde releaser.

Safety[edit]

Some people have a contact allergy to imidazolidinyl urea causing dermatitis.[1] Such people are often also allergic to diazolidinyl urea.

Chemistry[edit]

Imidazolidinyl urea was poorly characterized until recently and still has a wrong CAS structure assigned to it. New data show that the hydroxymethyl functional group of the imidazolidine ring is attached to the carbon, not the nitrogen atom:[2]

Imidazolidinyl urea (correct new structure) Imidazolidinyl urea (erroneous old structure)
Correct new structure Erroneous old structure

Synthesis[edit]

Imidazolidinyl urea is produced by the chemical reaction of allantoin and formaldehyde in the presence of sodium hydroxide solution and heat. The reaction mixture is then neutralized with hydrochloric acid and evaporated:

2 Allantoin + 3 H2C=O → Imidazolidinyl urea

Commercial imidazolidinyl urea is a mixture of different formaldehyde addition products including polymers.[2]

References[edit]

  1. ^ Review of toxicological data (NTP NIEHS)
  2. ^ a b Lehmann SV, Hoeck U, Breinholdt J, Olsen CE, Kreilgaard B. (2006). "Characterization and chemistry of imidazolidinyl urea and diazolidinyl urea". Contact Dermatitis 54 (1): 50–58. doi:10.1111/j.0105-1873.2006.00735.x. PMID 16426294.