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From Wikipedia, the free encyclopedia
A diamine is an amine with exactly two amino groups. Diamines are used as monomers to prepare polyamides, polyimides, and polyureas. The term diamine refers mostly to primary diamines, as those are the most reactive.[1]
![]() General structure of (primary) diamines. The primary amino groups (NH2) are marked blue, R is a divalent organic radical (e.g. a para-phenylene group). |
In terms of quantities produced, 1,6-diaminohexane (a precursor to Nylon 6-6) is most important, followed by ethylenediamine.[2] Vicinal diamines (1,2-diamines) are a structural motif in many biological compounds and are used as ligands in coordination chemistry.[3]
Derivatives of ethylenediamine are prominent:
Xylylenediamines are classified as alkylamines since the amine is not directly attached to an aromatic ring.
Three phenylenediamines are known:[5]
Various N-methylated derivatives of the phenylenediamines are known:
Examples with two aromatic rings include derivatives of biphenyl and naphthalene:
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