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4-Phenylurazole

4-Phenylurazole structure

CAS No.: 15988-11-1

Chemical Name:: 4-Phenylurazole

Synonyms: 4-Phenylurazol;AURORA KA-3647;4-PHENYLURAZOLE;4-phenyl urea yl;Urazole, 4-phenyl-;4-Phenylurazole>4-PHENYLURAZOLE 99.0%;4-Phenylurazole, 98+%;Calcitriol Impurity 5;Bicarbamimide, N-phenyl-

CBNumber:: CB2720962

Molecular Formula:: C8H7N3O2

Molecular Weight:: 177.16

MDL Number:: MFCD00005226

MOL File:: 15988-11-1.mol

MSDS File:: SDS

Last updated:2026-01-13 11:17:14

Product description	Number	Pack Size	Price
4-Phenylurazole 98%	188956	25g	$81.2
4-Phenylurazole >98.0%(T)	P1160	5g	$33
4-Phenylurazole >98.0%(T)	P1160	25g	$84
4-Phenyl-1,2,4-triazolidine-3,5-dione	P399408	250mg	$45
4-Phenyl-1,2,4-triazolidine-3,5-dione >97%	126518	10g	$64
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4-Phenylurazole Properties

Melting point	207-209 °C (lit.)
Boiling point	309.07°C (rough estimate)
Density	1.3393 (rough estimate)
refractive index	1.6500 (estimate)
storage temp.	Inert atmosphere,2-8°C
pka	5.43±0.30(Predicted)
form	powder to crystal
color	White to Almost white
BRN	163361
InChI	InChI=1S/C8H7N3O2/c12-7-9-10-8(13)11(7)6-4-2-1-3-5-6/h1-5H,(H,9,12)(H,10,13)
InChIKey	GOSUFRDROXZXLN-UHFFFAOYSA-N
SMILES	N1C(=O)N(C2=CC=CC=C2)C(=O)N1
CAS DataBase Reference	15988-11-1(CAS DataBase Reference)
FDA UNII	9V4N9J1BIH
NIST Chemistry Reference	4-Phenylurazole(15988-11-1)
EPA Substance Registry System	1,2,4-Triazolidine-3,5-dione, 4-phenyl- (15988-11-1)
UNSPSC Code	12352100
NACRES	NA.22

SAFETY

Risk and Safety Statements

Symbol(GHS)

GHS07

Signal word

Warning

Hazard statements

H302-H315-H319-H332-H335

Precautionary statements

P261-P280-P305+P351+P338

PPE

Eyeshields, Gloves, type N95 (US)

Safety Statements

22-24/25

WGK Germany

TSCA

TSCA listed

HS Code

29339990

Storage Class

11 - Combustible Solids

NFPA 704

	0
1		0

4-Phenylurazole price More Price(19)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
Sigma-Aldrich	188956	4-Phenylurazole 98%	15988-11-1	25g	$81.2	2025-07-31	Buy
TCI Chemical	P1160	4-Phenylurazole >98.0%(T)	15988-11-1	5g	$33	2025-07-31	Buy
TCI Chemical	P1160	4-Phenylurazole >98.0%(T)	15988-11-1	25g	$84	2025-07-31	Buy
TRC	P399408	4-Phenyl-1,2,4-triazolidine-3,5-dione	15988-11-1	250mg	$45	2021-12-16	Buy
Matrix Scientific	126518	4-Phenyl-1,2,4-triazolidine-3,5-dione >97%	15988-11-1	10g	$64	2021-12-16	Buy

Product number	Packaging	Price	Buy
188956	25g	$81.2	Buy
P1160	5g	$33	Buy
P1160	25g	$84	Buy
P399408	250mg	$45	Buy
126518	10g	$64	Buy

4-Phenylurazole Chemical Properties,Uses,Production

Description

4-phenylurazole is a kind of laboratory chemicals used for the manufacturing of some substances. It can be used as the precursor to the Diels-Alder trapping agent, 4-phenyl-1, 2, 4-triazoline-3, 5-Dione. Its derivative, azo dyes, has wide applications in dyes industry. In the presence of phosgene, terephthaloyl chloride and epichlorohydrin, it can be polymerized to yield insoluble polymer.

Chemical Properties

white to light beige cryst. powder or granules

Uses

Precursor to the Diels-Alder trapping agent, 4-phenyl-1,2,4-triazoline-3,5-dione.1,2,3

General Description

4-Phenylurazole undergoes oxidation in the presence of NO₂-N₂O₄ to yield 4-phenyl-1,2,4-trizoline-3,5-dione. It undergoes acetylation reaction with excess acetyl chloride in N,N-dimethylacetamide solution. It polymerizes in the presence of phosgene, terephthaloyl chloride and epichlorohydrin to yield insoluble polymer. It is precursor to the Diels-Alder trapping agent, 4-phenyl-1,2,4-triazoline-3,5-dione. This urazole was recently demonstrated in the traceless, chemoselective labeling of peptides and proteins through electrochemical tyrosine-click (e-Y-CLICK) chemistry.

Purification Methods

Crystallise 4-phenylurazole from water or 95% EtOH. Dissolve 35g in 80mL of boiling 95% EtOH and on cooling 90-95% is recovered with m 209-210o. It has IR with 1685 and 3120cm-1. [Cookson et al. Org max Synth 51 121 1971, Beilstein 26 I 64, 26 III/IV 540.]

References

http://www.sigmaaldrich.com/catalog/product/aldrich/188956lang=en&region=US&gclid=EAIaIQobChMI6r7k0eu71gIV1IZoCh0nwgLjEAAYASAAEgI0tvD_BwE
http://nopr.niscair.res.in/handle/123456789/21799

4-Phenylurazole synthesis

Synthesis of 4-Phenylurazole from METHYL 2-(ANILINOCARBONYL)-1-HYDRAZINECARBOXYLATE

4-Phenylurazole Preparation Products And Raw materials

Raw materials

Phenyl isocyanate Potassium hydroxide solution Semicarbazide Diethyl carbonate 4-PHENYL-1,2,4-TRIAZOLINE-3,5-DIONE

Preparation Products

4-Phenylurazole Suppliers

Global( 188)Suppliers

Supplier	Tel	Email	Country	ProdList	Advantage
Capot Chemical Co.,Ltd.	+86-（0）57185586718; +8613336195806	sales@capot.com	China	29735	60
Shanghai Daken Advanced Materials Co.,Ltd	+86-2158073036	info@dakenam.com	China	13799	58
ATK CHEMICAL COMPANY LIMITED	+undefined-21-51877795	ivan@atkchemical.com	China	33024	60
Zhejiang ZETian Fine Chemicals Co. LTD	+8618957127338	stella@zetchem.com	China	2994	58
Standardpharm Co. Ltd.	86-714-3992388	overseasales1@yongstandards.com	United States	14332	58
Alchem Pharmtech,Inc.	8485655694	sales@alchempharmtech.com	United States	63687	58
CONIER CHEM AND PHARMA LIMITED	+8618523575427	sales@conier.com	China	49977	58
career henan chemical co	+86-0371-86658258 +8613203830695	factory@coreychem.com	China	29795	58
Shaanxi Dideu Medichem Co. Ltd	+86-29-87569266 +86-17392581500	1015@dideu.com	China	3986	58
Neostar United (Changzhou) Industrial Co., Ltd.	+86-0519-85551759 +8613506123987	marketing1@neostarunited.com	China	8830	58

Supplier	Advantage
Capot Chemical Co.,Ltd.	60
Shanghai Daken Advanced Materials Co.,Ltd	58
ATK CHEMICAL COMPANY LIMITED	60
Zhejiang ZETian Fine Chemicals Co. LTD	58
Standardpharm Co. Ltd.	58
Alchem Pharmtech,Inc.	58
CONIER CHEM AND PHARMA LIMITED	58
career henan chemical co	58
Shaanxi Dideu Medichem Co. Ltd	58
Neostar United (Changzhou) Industrial Co., Ltd.	58

View Lastest Price from 4-Phenylurazole manufacturers

Image	Update time	Product	Price	Min. Order	Purity	Supply Ability	Manufacturer
	2020-01-09	4-Phenylurazole 15988-11-1	US $9.80 / KG	1g	≥99%	100kg	Career Henan Chemical Co

4-Phenylurazole
15988-11-1
US $9.80 / KG
≥99%
Career Henan Chemical Co

4-Phenylurazole Spectrum

4-Phenylurazole(15988-11-1)MS 4-Phenylurazole(15988-11-1)¹HNMR 4-Phenylurazole(15988-11-1)¹³CNMR 4-Phenylurazole(15988-11-1)IR1 4-Phenylurazole(15988-11-1)IR2 4-Phenylurazole(15988-11-1)Raman

15988-11-1(4-Phenylurazole)Related Search:

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Phenylacetone URAZOLE Phenylurea

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AURORA KA-3647 4-PHENYLTETRAHYDRO-1,2,4-TRIAZOLE-3,5-DIONE 4-PHENYLURAZOLE 4-PHENYL-1,2,4-TRIAZOLANE-3,5-DIONE 4-PHENYL-1,2,4-TRIAZOLIDINE-3,5-DIONE 1,2,4-Triazolidine-3,5-dione, 4-phenyl- 1,2,4-Triazolidine-3,5-dione,4-phenyl- 2,4-Triazolidine-3,5-dione,4-phenyl-1 4-Phenylurazol 4-triazolidine-3,5-dione,4-phenyl-2 Bicarbamimide, N-phenyl- Urazole, 4-phenyl- 4-Phenyl-1,2,4-triazdidine-3,5-dione 4-Phenylurazole, HPLC 98% 1,2-Dihydro-4-phenyl-4H-1,2,4-triazole-3,5-dione 4-Phenyl-1,2,4-triazole-3,5-diol 4-Phenyl-4H-1,2,4-triazole-3,5-diol 4-Phenyltetrahydro-1H-1,2,4-triazole-3,5-dione 4-phenyl urea yl 4-PHENYLURAZOLE 99.0% 4-Phenylurazole, 98+% 4-PHENYLURAZOLE FOR SYNTHESIS 4-Phenyl-1,2,4-triazolidine-3,5-dione 98% 4-Phenylurazole, 3,5-Dioxo-4-phenyl-1,2,4-triazolidine CHEMICAL - 4-PHENYL URAZOLE Calcitriol Impurity 5 4-Phenylurazole> 15988-11-1 15988-11-0 Building Blocks Heterocyclic Building Blocks Triazoles Building Blocks Chemical Synthesis Heterocyclic Building Blocks Triazoles Naphthyridine,Quinoline