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2-Aminophenol-4-sulfonic acid

2-Aminophenol-4-sulfonic acid structure

CAS No.: 98-37-3

Chemical Name:: 2-Aminophenol-4-sulfonic acid

Synonyms: ORTHO AMINO PHENOL 4 SULPHONIC ACID;OAPSA;NSC1491;NSC 1491;NSC-1491;2-AMino phenol-4-acid;2-Amino-4-sulfophenol;4-Hydroxymetanilic acid;2-Hydroxymetanilic acid;2-Aminophenol-4-Sulfonic

CBNumber:: CB2723842

Molecular Formula:: C6H7NO4S

Molecular Weight:: 189.19

MDL Number:: MFCD00007696

MOL File:: 98-37-3.mol

MSDS File:: SDS

Last updated:2026-05-28 00:52:36

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2-Aminophenol-4-sulfonic acid Properties

Melting point	≥300 °C(lit.)
Boiling point	398.09℃[at 101 325 Pa]
Density	1.5149 (rough estimate)
vapor pressure	0Pa at 25℃
refractive index	1.5500 (estimate)
storage temp.	Keep in dark place,Sealed in dry,Room Temperature
form	powder to crystal
pka	-0.81±0.50(Predicted)
color	Orange to Amber to Dark red
Water Solubility	<0.1 g/100 mL at 21.5 ºC
BRN	514765
Stability	Stable. Incompatible with strong oxidizing agents, strong acids and strong bases.
InChI	1S/C6H7NO4S/c7-5-3-4(12(9,10)11)1-2-6(5)8/h1-3,8H,7H2,(H,9,10,11)
InChIKey	ULUIMLJNTCECJU-UHFFFAOYSA-N
SMILES	Nc1cc(ccc1O)S(O)(=O)=O
LogP	-2.56 at 25℃
CAS DataBase Reference	98-37-3(CAS DataBase Reference)
EWG's Food Scores	1
FDA UNII	4WE7CX7RD5
EPA Substance Registry System	4-Hydroxymetanilic acid (98-37-3)
UNSPSC Code	12352100
NACRES	NA.22

SAFETY

Risk and Safety Statements

Symbol(GHS)

GHS07

Signal word

Warning

Hazard statements

H315-H319

Precautionary statements

P302+P352-P305+P351+P338

PPE

Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges

Hazard Codes

Risk Statements

Safety Statements

26-36/37/39-45

RIDADR

UN 2585 8/PG 3

WGK Germany

TSCA

TSCA listed

HS Code

2922299090

HazardClass

PackingGroup

III

Storage Class

8A - Combustible corrosive hazardous materials

Hazard Classifications

Eye Irrit. 2
Skin Irrit. 2

REACH Registrations

Active

NFPA 704

	0
3		0

2-Aminophenol-4-sulfonic acid price More Price(32)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
Sigma-Aldrich	09180	3-Amino-4-hydroxybenzenesulfonic acid technical, ≥95% (T)	98-37-3	250g	$124	2023-06-20	Buy
Sigma-Aldrich	09180	3-Amino-4-hydroxybenzenesulfonic acid technical, ≥95% (T)	98-37-3	20g	$26	2023-01-07	Buy
TCI Chemical	A0399	3-Amino-4-hydroxybenzenesulfonic Acid Hydrate >98.0%(T)	98-37-3	25g	$40	2026-04-30	Buy
TCI Chemical	A0399	3-Amino-4-hydroxybenzenesulfonic Acid Hydrate >98.0%(T)	98-37-3	500g	$223	2026-04-30	Buy
Matrix Scientific	157293	3-Amino-4-hydroxybenzenesulfonic acid semihydrate	98-37-3	1.00g	$120	2026-05-18	Buy

Product number	Packaging	Price	Buy
09180	250g	$124	Buy
09180	20g	$26	Buy
A0399	25g	$40	Buy
A0399	500g	$223	Buy
157293	1.00g	$120	Buy

2-Aminophenol-4-sulfonic acid Chemical Properties, Uses, Production

Chemical Properties

brown crystals

Uses

3-Amino-4-hydroxybenzenesulfonic acid can be used to synthesize various heterocyclic Schiff bases for imaging applications. 3-Amino-4-hydroxybenzenesulfonic acid can also be used for comparative assessment in the Tetrahymena pyriformis growth inhibition assay.

Production Methods

2-Aminophenol-4-sulfonic acid is obtained by boiling 4-chloro-3- nitrobenzenesulfonic acid with sodium hydroxide solution, followed by Béchamp reduction.

General Description

Rhombic brown crystals.

Air & Water Reactions

2-Aminophenol-4-sulfonic acid may be sensitive to prolonged exposure to air. Insoluble in water.

Reactivity Profile

2-Aminophenol-4-sulfonic acid may react with strong oxidizers and mineral acids or bases.

Fire Hazard

Flash point data for 2-Aminophenol-4-sulfonic acid is not available, however 2-Aminophenol-4-sulfonic acid is probably combustible.

2-Aminophenol-4-sulfonic acid synthesis

Synthesis of 2-Aminophenol-4-sulfonic acid from 2-Aminophenol

2-Aminophenol-4-sulfonic acid Preparation Products And Raw materials

Raw materials

Zinc oxide Phosphoric acid 2-Nitrophenol 4-hydroxy-3-nitrobenzenesulphonic acid 4-Chloro-3-nitrobenzenesulfonic acid

Sulfuric acid 2-Aminophenol

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Preparation Products

trisodium [mu-[2-[[1-hydroxy-6-[[[[5-hydroxy-6-[(2-hydroxy-5-sulphophenyl)azo]-7-sulpho-2-naphthyl]amino]carbonyl]amino]-3-sulpho-2-naphthyl]azo]benzoato(7-)]]dicuprate(3-) trisodium [2-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-5-hydroxy-6-[(2-hydroxy-5-sulphophenyl)azo]naphthalene-1,7-disulphonato(5-)]cuprate(3-) Direct Blend Rubine D-BLL Reactive Violet 2 Solvent Yellow 21

2-Amino-6-nitro-1-phenol-4-sulfonic acid REACTIVE VIOLET 2 Acid alizarin violet N trisodium [mu-[2-[[1-hydroxy-6-[[[[5-hydroxy-6-[(2-hydroxy-5-sulphophenyl)azo]-7-sulpho-2-naphthyl]amino]carbonyl]amino]-3-sulpho-2-naphthyl]azo]benzoato(7-)]]dicuprate(3-) Mordant Orange 37

DIRECT RED 243 Acid chrome blue K trisodium [7-[[4-[[4-[[4-[[2,4-dihydroxy-5-[(2-hydroxy-5-sulphophenyl)azo]phenyl]azo]benzoyl]amino]-o-tolyl]azo]-o-tolyl]azo]naphthalene-1,3-disulphonato(5-)]cuprate(3-) DIRECT BROWN 95 Reactive Blue 104

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2-Aminophenol-4-sulfonic acid Suppliers

Global Suppliers ( 379)

Supplier	Tel	Email	Country	ProdList	Advantage
Shanghai Kangtuo Chemical Co., Ltd.	021-69185552 13701777608	kangtuochem@163.com	China	4224	55
Hubei zhonglong Kangsheng Fine Chemical Co., Ltd	027-027-83850178 18162590268	1984393783@qq.com	China	7229	58
J & K SCIENTIFIC LTD.	18210857532 18210857532	jkinfo@jkchemical.com	China	96815	76
future industrial shanghai co., ltd	400-0066400 13621662912	sales@jonln.com	China	1989	65
TCI (Shanghai) Development Co., Ltd.	021-67121386	Sales-CN@TCIchemicals.com	China	24512	81
Energy Chemical	400-0056266	sales8178@energy-chemical.com	China	44567	61
Adamas Reagent, Ltd.	4006009262 13023226327	hmj@titansci.com	China	14098	59
Shanghai Hanhong Scientific Co.,Ltd.	021-54306202 13764082696	info@hanhongsci.com	China	42917	64
XiaoGan ShenYuan ChemPharm co,ltd	15527621225; 15527621225	1791901229@qq.com	China	6716	52
Beijing Isomersyn Technology CO;LTD	010-82954736 13391601435	sales@isomersyn.com	China	3294	57

Supplier	Advantage
Shanghai Kangtuo Chemical Co., Ltd.	55
Hubei zhonglong Kangsheng Fine Chemical Co., Ltd	58
J & K SCIENTIFIC LTD.	76
future industrial shanghai co., ltd	65
TCI (Shanghai) Development Co., Ltd.	81
Energy Chemical	61
Adamas Reagent, Ltd.	59
Shanghai Hanhong Scientific Co.,Ltd.	64
XiaoGan ShenYuan ChemPharm co,ltd	52
Beijing Isomersyn Technology CO;LTD	57

View Latest Price from 2-Aminophenol-4-sulfonic acid manufacturers

Update time	Product	Price	Min. Order	Purity	Supply Ability	Manufacturer
2026-09-02	2-Aminophenol-4-sulfonic acid 98-37-3	$3.00-8.00	1KG	99%		Henan Fengda Chemical Co., Ltd
2026-08-20	2-Aminophenol-4-sulfonic acid 98-37-3	$1.10	1g	99.00%	100 Tons Min	Dideu Industries Group Limited
2026-03-20	2-Aminophenol-4-sulfonic acid 98-37-3		1KG	99%	20 mt	Hebei Chuanghai Biotechnology Co., Ltd

2-Aminophenol-4-sulfonic acid
98-37-3
$3.00-8.00
99%
Henan Fengda Chemical Co., Ltd

2-Aminophenol-4-sulfonic acid
98-37-3
$1.10
99.00%
Dideu Industries Group Limited

2-Aminophenol-4-sulfonic acid
98-37-3
99%
Hebei Chuanghai Biotechnology Co., Ltd

2-Aminophenol-4-sulfonic acid Spectrum

2-Aminophenol-4-sulfonic acid(98-37-3)MS 2-Aminophenol-4-sulfonic acid(98-37-3)¹HNMR 2-Aminophenol-4-sulfonic acid(98-37-3)IR1 2-Aminophenol-4-sulfonic acid(98-37-3)IR2

98-37-3 (2-Aminophenol-4-sulfonic acid) Related Search:

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Sulfamic acid 4-Aminophenol 2-Aminophenol Sodium hydroxybenzenesulfonate Glycine

Phenoldisulfonic acid XYLIDYL BLUE I SODIUM SALT 6-NITRO-2-AMINOPHENOL-4-SULFONIC ACID C.I. 14720 Acid red 4

Acid alizarin violet N ZINCON 2-Aminophenol-4-Sulfonmethylamide

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3-amino-4-hydroxybenzenesulfonic acid semihydrate 4-Hydroxy-3-aminobenzenesulfonic acid Benzenesulfonicacid,3-amino-4-hydroxy- 3-AMINO-4-HYDROXYBENZENESULFONIC ACID 3-AMINO-4-HYDROXYBENZENESULFONIC ACID HYDRATE 3-AMINO-4-HYDROXYBENZENE-4-SULFONIC ACID HYDRATE 4-HYDROXYMETANILIC ACID HYDRATE 2 AMINO-1-PHENOL-4-SULFONIC ACID 2-AMINOPHENOL-4-SULFONIC ACID 2-AMINOPHENOL-4-SULFONIC ACID HYDRATE 2-AMINOPHENOL-4-SULPHONIC ACID 3-AMINO-4-HYDROXYBENZENESULFONIC ACID HY 2-Amino-1-hydroxybenzene-4-sulfonicacid O-AMINOPHENOL-4-SULFONIC ACID 2-Amino-4-phenolsulfonic acid 4-Hydroxymetanilic acid 2-Aminophenol-4-Sulfonic 3-Amino-4-hydroxybenzenesulfon 3-amino-4-hydroxybenzene-4-sulfonic acid 2-AMINO-1-PHENOL-4-SULPHONIC ACID ORTHO AMINO PHENOL SULPHONIC ACID 3-amino-4-hydroxybenzenesulphonic acid BENZENESULFONIC ACID,3-AMINO,4-HYDROXY 2-AMINO,4-SULFOPHENOL Metanilic acid, 4-hydroxy- Metanilic acid, 4-hydroxy- (8CI) O-AMINOPHENOL-P-SULFONIC ACID OAPSA ORTHO AMINO PHENOL 4-SULFONIC ACID 3-amino-4-hydroxy-benzenesulfonicaci AMINOPHENOLSULPHONICACID 3-Amino-4-hydroxybenzolsulfonsure 2-Aminophenol-1-sulfonicacid 2-Hydroxy-5-sulfoaniline 2-Hydroxymetanilic acid 3-azanyl-4-hydroxy-benzenesulfonic acid 2-AMino phenol-4-acid 2-Aminophenol-4-sulfonic Acid 4-Hydroxymetanilic Acid 3-Amino-4-hydroxybenzenesulfonic acid technical, >=95% (T) 2-Amino-4-sulfophenol 2-amino-9-[(2R,4S,5R)-4-fluoro-5-(hydroxymethyl)-2-oxolanyl]-3H-purin-6-one 3-Amino-4-hydroxybenzenesulfonic Acid Hydrate> 2-Aminophenol-4-sulfonic acid ISO 9001：2015 REACH NSC 1491 NSC1491 NSC-1491 2 Ortho Amino Phenol 4 Sulphonic Acid(OAPSA) 3-Amino-4-hydroxybenzenesulfonic 2-Aminophenol-4-sulfonic acid (APS) ORTHO AMINO PHENOL 4 SULPHONIC ACID 98-37-3 98-73-3 C6H7NO42H2O H2NC6H3OHSO3H H2NC6H3OHSO3HxH2O C6H7NO4SxH2O C6H3OHNH2SO3H C12H16N2O9S2 2C6H7NO4SH2O