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Imidazolidinyl urea
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
CAS Number	39236-46-9 = ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:51805 ;
ChEMBL	ChEMBL65433 ;
ChemSpider	35067 ;
ECHA InfoCard	100.049.411
EC Number	254-372-6;
PubChem CID	38258;
UNII	M629807ATL ;
CompTox Dashboard (EPA)	DTXSID2040151 ;
	InChI InChI=1S/C11H16N8O8/c20-2-18-4(6(22)16-10(18)26)14-8(24)12-1-13-9(25)15-5-7(23)17-11(27)19(5)3-21/h4-5,20-21H,1-3H2,(H2,12,14,24)(H2,13,15,25)(H,16,22,26)(H,17,23,27) Key: ZCTXEAQXZGPWFG-UHFFFAOYSA-N ; InChI=1/C11H16N8O8/c20-2-18-4(6(22)16-10(18)26)14-8(24)12-1-13-9(25)15-5-7(23)17-11(27)19(5)3-21/h4-5,20-21H,1-3H2,(H2,12,14,24)(H2,13,15,25)(H,16,22,26)(H,17,23,27) Key: ZCTXEAQXZGPWFG-UHFFFAOYAS;
	SMILES O=C2N(CO)C(NC(=O)NCNC(=O)NC1C(=O)NC(=O)N1CO)C(=O)N2; C(NC(=O)NC1C(=O)NC(=O)N1CO)NC(=O)NC2C(=O)NC(=O)N2CO;
Properties
Chemical formula	C11H16N8O8
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). verify (what is ?) 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

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

Chemistry

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

Synthesis

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

+ 3 H₂C=O →

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

References

^ Review of toxicological data (NTP NIEHS)
^ ^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. S2CID 25897828.

[NIEHS-1] Review of toxicological data (NTP NIEHS)

[structure-2] 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. S2CID 25897828.

[1]

[2]