A diamine is a type of polyamine with exactly two amino groups. Diamines are mainly used as monomers to prepare polyamides, polyimides and polyureas. In terms of quantities produced, 1,6-diaminohexane, a precursor to Nylon 6-6, is most important, followed by ethylenediamine.[1] Hydrazine (H2NNH2) is usually not considered a diamine since it is neither an amine nor is it dibasic.


Aliphatic diamines

Linear aliphatic diamines

Branched aliphatic diamines

Derivatives of ethylenediamine are numerous:


Xylylenediamines are classified as alkylamines since the amine is not directly attached to an aromatic ring.

  • o-xylylenediamine or OXD
  • m-xylylenediamine or MXD
  • p-xylylenediamine or PXD

Aromatic diamines

Three phenylenediamines are known:[2]

Various N-methylated derivatives of the phenylenediamines are known:

Examples with two aromatic rings include derivatives of biphenyl and naphthalene:


  1. ^ Karsten Eller, Erhard Henkes, Roland Rossbacher, Hartmut Höke "Amines, Aliphatic" in Ullmann's Encyclopedia of Industrial Chemistry, 2005 Wiley-VCH Verlag, Weinheim. doi:10.1002/14356007.a02_001
  2. ^ Robert A. Smiley “Phenylene- and Toluenediamines” in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim. doi:10.1002/14356007.a19_405

External links