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15988-11-1 - 4-Phenylurazole, 98+% - 4-Phenyl-1,2,4-triazolidine-3,5-dione - L00255 - Alfa Aesar

L00255 4-Phenylurazole, 98+%

CAS Number

Size Price ($) Quantity Availability
5g 25.30
25g 84.00
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4-Phenylurazole, 98+%


Chemical Properties

Formula Weight
Melting point

Literature References

Oxidation gives the aza-dienophile 4-phenyl-1,2,4-triazolinedione which is more reactive in cycloaddition reactions than tetracyanoethylene: J. Chem. Soc. (C), 1905 (1967); Angew. Chem. Int. Ed., 11, 715 (1972); Org. Prep. Proced. Int., 7, 251 (1975). Suitable oxidants include t-butyl hypochlorite: Org. Synth. Coll., 6, 936 (1988), or lead(IV) acetate: J. Org. Chem., 32, 330 (1967). For a further example, see Propargyl­triphenyl­phosphonium bromide, A12753.


The adducts can be cleaved to the hydrazo-compounds by hydrazine hydrate. Cu(II) oxidation provides a route to azoalkanes: Synthesis, 543 (1981).


Reacts with enolizable ketones in the presence of TFA to give ɑ-urazyl ketones: J. Org. Chem., 55, 193 (1990), which may be oxidized to ɑ-diketones with t-butyl hypochlorite: J. Org. Chem., 55, 197 (1990):


ß-Diketones form adducts without an added catalyst. These yield 1,2,3-triketones on cleavage.


Review of use of azodicarbonyl compounds in synthesis: Adv. Het. Chem., 30, 1 (1982).


1,2,4-Triazolinediones form charge-transfer complexes with electron-rich aromatics, such as di- or trimethoxybenzenes: J. Org. Chem., 48, 1708 (1983).


GHS Hazard and Precautionary Statements

Precautionary Statements: P260u-P201-P280-P303+P361+P353-P305+P351+P338-P301+P330+P331-P304+P340-P310a-P405-P501a

Obtain special instructions before use. Wear protective gloves/protective clothing/eye protection/face protection. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.

Other References

Harmonized Tariff Code


  • L15141

    [Bis(trifluoroacetoxy)iodo]benzene, 97%
  • 11652

    Cobalt(II) perchlorate hexahydrate, Reagent Grade
  • 32546

    Dicyclopentadiene, typically 95%, stab.
  • 41389

    Chloroform-d, 99.8% (Isotopic), contains 0.03% v/v TMS
  • 89892

    Oxone®, monopersulfate

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