Imidazolidinyl urea

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Imidazolidinyl urea
Imidazolidinyl urea correct formula.png
Imidazolidinyl urea erroneous formula.png
IUPAC names
Correct new structure (upper pic.):
Erroneous old structure (lower pic.):
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
3D model (JSmol)
ECHA InfoCard 100.049.411
EC Number
  • 254-372-6
Molar mass 388.29 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☑Y verify (what is ☑Y☒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.


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


Imidazolidinyl urea was poorly characterized until recently and the single Chemical Abstracts Service structure assigned to it is probably not the major one in the commercial material. Instead, new data indicate that the hydroxymethyl functional group of each imidazolidine ring is attached to the carbon, rather than on the nitrogen atom:[2]

Originally reported structure Hoeck's revised structure
Originally reported structure Hoeck's revised structure


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]


  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.