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4-Phenylurazole

4-Phenylurazole structure

CAS No.: 15988-11-1

Chemical Name:: 4-Phenylurazole

Synonyms: 4-PHENYL-1,2,4-TRIAZOLIDINE-3,5-DIONE;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

CBNumber:: CB2720962

Molecular Formula:: C8H7N3O2

Molecular Weight:: 177.16

MDL Number:: MFCD00005226

MOL File:: 15988-11-1.mol

MSDS File:: SDS

TDS File:: TDS

Last updated:2026-05-28 00:49:14

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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
form	powder to crystal
pka	5.43±0.30(Predicted)
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(45)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
Sigma-Aldrich	188956	4-Phenylurazole 98%	15988-11-1	25g	$124	2026-04-30	Buy
TCI Chemical	P1160	4-Phenylurazole >98.0%(T)	15988-11-1	5g	$25	2026-04-30	Buy
TCI Chemical	P1160	4-Phenylurazole >98.0%(T)	15988-11-1	25g	$61	2026-04-30	Buy
Biosynth	FP02003	4-Phenylurazole	15988-11-1	5kg	$6352.5	2026-06-04	Buy
Biosynth	FP02003	4-Phenylurazole	15988-11-1	10kg	$10828.1	2026-06-04	Buy

Product number	Packaging	Price	Buy
188956	25g	$124	Buy
P1160	5g	$25	Buy
P1160	25g	$61	Buy
FP02003	5kg	$6352.5	Buy
FP02003	10kg	$10828.1	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( 191)Suppliers

Supplier	Tel	Email	Country	ProdList	Advantage
Chengdu syns Pharmaceutical Co., Ltd.	028-82093588 18980782991	sales@syns.org	China	61	55
Beijing FYF Chemicals Co., Ltd	010-57903446 15869909019	168931144@qq.com	China	2876	58
Shanghai Pin Research Chemical Co., Ltd.	15900489257	271793832@qq.com	China	37	58
GT Chemical & Technology (changzhou) Co.,Ltd	0519-86889226 18015049226	jifuzhong01@163.com	China	41	58
J & K SCIENTIFIC LTD.	18210857532 18210857532	jkinfo@jkchemical.com	China	96815	76
Meryer (Shanghai) Chemical Technology Co., Ltd.	4006356688 18621169109	market03@meryer.com	China	40202	62
INTATRADE GmbH	+49 3493/605464	sales@intatrade.de	Germany	3563	66
3B Pharmachem (Wuhan) International Co.,Ltd.	18930552037	3bsc@sina.com	China	15813	69
Alfa Aesar	400-6106006	saleschina@alfa-asia.com	China	30103	84
TCI (Shanghai) Development Co., Ltd.	021-67121386	Sales-CN@TCIchemicals.com	China	24512	81

Supplier	Advantage
Chengdu syns Pharmaceutical Co., Ltd.	55
Beijing FYF Chemicals Co., Ltd	58
Shanghai Pin Research Chemical Co., Ltd.	58
GT Chemical & Technology (changzhou) Co.,Ltd	58
J & K SCIENTIFIC LTD.	76
Meryer (Shanghai) Chemical Technology Co., Ltd.	62
INTATRADE GmbH	66
3B Pharmachem (Wuhan) International Co.,Ltd.	69
Alfa Aesar	84
TCI (Shanghai) Development Co., Ltd.	81

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	$9.80	1g	≥99%	100kg	Career Henan Chemical Co

4-Phenylurazole
15988-11-1
$9.80
≥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

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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 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> 4-PHENYL-1,2,4-TRIAZOLIDINE-3,5-DIONE 15988-11-1 15988-11-0 Building Blocks Heterocyclic Building Blocks Triazoles Building Blocks Chemical Synthesis Heterocyclic Building Blocks Triazoles Naphthyridine,Quinoline