Imidazolidine

Chemical compound From Wikipedia, the free encyclopedia

Imidazolidine

Imidazolidine is a heterocyclic compound (CH2)2(NH)2CH2. The parent imidazolidine is lightly studied, but related compounds substituted on one or both nitrogen centers are more common. Generally, they are colorless, polar, basic compounds. Imidazolidines are cyclic 5-membered examples of the general class of aminals.

Quick Facts Names, Identifiers ...
Imidazolidine
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Names
Preferred IUPAC name
Imidazolidine[1]
Systematic IUPAC name
1,3-Diazacyclopentane
Other names
Tetrahydroimidazole
1,3-Diazolidine
Identifiers
3D model (JSmol)
102462
ChEBI
ChemSpider
UNII
  • InChI=1S/C3H8N2/c1-2-5-3-4-1/h4-5H,1-3H2 N
    Key: WRYCSMQKUKOKBP-UHFFFAOYSA-N N
  • InChI=1/C3H8N2/c1-2-5-3-4-1/h4-5H,1-3H2
    Key: WRYCSMQKUKOKBP-UHFFFAOYAC
  • N1CCNC1
Properties
C3H8N2
Molar mass 72.109
Supplementary data page
Imidazolidine (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation

Imidazolidines are traditionally prepared by condensation reaction of 1,2-diamines and aldehydes. Most commonly, one or both nitrogen center is substituted with an alkyl or benzyl (Bn) group:[2]

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The first unsubstituted imidazolidine synthesis was reported in 1952.[3]

Reactions

Unsubstituted imidazolidines are often labile.[4] The rings are susceptible to hydrolysis back to the diamine and the aldehyde.[2]

Formally, removal of the two hydrogens at carbon 2 (between the two nitrogens) would yield the carbene dihydroimidazol-2-ylidene. Derivatives of the latter comprise an important class of persistent carbenes.[5]

Classified as a diamine, it is formally derived by the addition of four hydrogen atoms to imidazole. The intermediate, resulting from the addition of only two hydrogen atoms is called imidazoline (dihydroimidazole). The connection of imidazolidine to related compounds is indicated in the Figure.

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Structure relationship of imidazole and its reduced derivatives.

References

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