Triazenes

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Organic compounds with a diazoamino group

title: "Triazenes" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["functional-groups", "triazenes"] description: "Organic compounds with a diazoamino group" topic_path: "general/functional-groups" source: "https://en.wikipedia.org/wiki/Triazenes" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Organic compounds with a diazoamino group ::

thumb|200px|[[Dacarbazine]] is a triazene used in the treatment of [[melanoma]] and [[Hodgkin's lymphoma]]. ::figure[src="https://upload.wikimedia.org/wikipedia/commons/2/23/Triacsin_c.png" caption="[[Triacsin C]] is a triazene made by certain [[bacteria]] species."] ::

Triazenes are organic compounds that contain the functional group R1−N=N−NR2R3, where the R are each any of various types of substituent groups. Some medications and dyes are triazenes. Formally, the triazenes are related to the unstable chemical triazene, H2N−N=NH.

Production

Triazenes are prepared from the N-coupling reaction between diazonium salts and primary or secondary amines. The coupling reactions are typically mild, using a base such as sodium acetate, sodium carbonate, or sodium bicarbonate.

The diazonium reagents are themselves available starting from amines. For symmetrical triazenes derived from primary amines, partial diazotization gives a mixture of the original amine and its diazo derivative that then couple with each other. For example, 1,3-diphenyltriazene (PhN=N−NHPh) can be made from aniline in a one-pot reaction. For asymmetrical triazenes, for example (phenyldiazenyl)pyrrolidine (PhN=N−NC4H8), the phenyldiazonium salt must be pre-made. :[[File:Azo N coupling.jpg|500px|alt=Azo N-coupling|Production of symmetrical (top) and asymmetrical (bottom) triazenes]]

Analogues of Tröger's base containing a symmetric pair of asymmetric triazene side-chains have been obtained similarly.

:[[File:Bis-triazene.jpg|500px|Bis-triazene analogue of Tröger's base]]

Reactions and applications

Triazenes derived from primary amines engage in tautomerism. In the case of symmetric triazenes, the tautomers are identical. :[[Image:triazen.png|300px|Tautomerism of triazenes derived from primary amines]]

Triazenes can be converted to diazonium salts. ::figure[src="https://upload.wikimedia.org/wikipedia/commons/6/6b/Triazene_1.tif" caption="Triazenes used in the synthesis of [[thiophenol]]s"] ::

Triazenes decompose in the presence of protonating or alkylating agents into quaternary amines and diazonium salts; as such triazenes have been used as an in situ source of diazonium that reacted with sodium sulfide to give the corresponding thiophenols. A strategy for the protection and deprotection of sensitive secondary amines is based on this principle.

Polymeric triazenes are applied as conductive and absorbent materials. Triazenes have been used in the synthesis of cinnoline, functionalized lactams, and coumarins.

References

References

  1. "Dacarbazine". The American Society of Health-System Pharmacists.
  2. Suleymanov, Abdusalom A.. (2021-03-22). "Vinyl and Alkynyl Triazenes: Synthesis, Reactivity, and Applications". Angewandte Chemie International Edition.
  3. Berneth, Horst. (2008). "Methine Dyes and Pigments".
  4. (2002). "Synthesis of Symmetrical ''trans''-Stilbenes by a Double Heck Reaction of (Arylazo)amines with Vinyltriethoxysilane: ''trans''-4,4′-Dibromostilbene". Organic Syntheses.
  5. (2012). "Novel One-Pot Synthesis of Thiophenols from Related Triazenes under Mild Conditions". Synlett.
  6. Hartman, W. W.; Dickey, J. B.. (1934). "Diazoaminobenzene". Organic Syntheses.
  7. Kazemostami, Masoud. (2017). "Facile preparation of Ʌ-shaped building blocks: Hünlich-base derivatization". Synlett.
  8. (2002). "Triazenes: A Versatile Tool in Organic Synthesis". Angewandte Chemie International Edition.
  9. (1999). "Triazenes: A Useful Protecting Strategy for Sensitive Secondary Amines". Synlett.
  10. (2013). "Synthesis, characterization, and application of a triazene-based polysulfone as a dye adsorbent". Journal of Applied Polymer Science.

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functional-groupstriazenes