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2-Aminotoluene-5-sulfonic acid

2-Aminotoluene-5-sulfonic acid Structure
2-Aminotoluene-5-sulfonic acid structure
CAS No.
98-33-9
Chemical Name:
2-Aminotoluene-5-sulfonic acid
Synonyms
OTS;4-AMINO-3-METHYLBENZENESULFONIC ACID;2-TOLUIDINE-5-SULFONIC ACID;6-Amino-m-toluensulfonic acid;4-Amino-3-methylbenzene-1-sulfonic acid;2-Amino-5-sulfotoluene;2-Methyl-4-sulfoaniline;3-methylsulphanilic acid;2-Aminotoluene-5-sulfoni;o-Toluidine-4-sulfonic acid
CBNumber:
CB4450302
Molecular Formula:
C7H9NO3S
Molecular Weight:
187.22
MDL Number:
MFCD00025198
MOL File:
98-33-9.mol
MSDS File:
SDS
Last updated:2026-08-28 09:47:23
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2-Aminotoluene-5-sulfonic acid Properties

Melting point 290°C
Density 1.3553 (rough estimate)
refractive index 1.6100 (estimate)
storage temp. Storage temp. 2-8°C
pka pK1: 3.125 (25°C)
form powder
color Faint beige to faint red/orange
Water Solubility 5g/L(20 ºC)
InChI InChI=1S/C7H9NO3S/c1-5-4-6(12(9,10)11)2-3-7(5)8/h2-4H,8H2,1H3,(H,9,10,11)
InChIKey WQTCZINVPXJNEL-UHFFFAOYSA-N
SMILES C1(S(O)(=O)=O)=CC=C(N)C(C)=C1
LogP 0.076 at 25℃
CAS DataBase Reference 98-33-9(CAS DataBase Reference)
FDA UNII ET833CB2KU
EPA Substance Registry System Benzenesulfonic acid, 4-amino-3-methyl- (98-33-9)

SAFETY

Risk and Safety Statements

Symbol(GHS)  Exclamation Mark (GHS07)
GHS07
Signal word  Warning
Hazard statements  H315-H319-H335
Precautionary statements  P261-P280a-P304+P340-P305+P351+P338-P405-P501a
Hazard Codes  T
Risk Statements  45-34
Safety Statements  53-26-36/37/39-45
RIDADR  2811
TSCA  TSCA listed
HazardClass  8
PackingGroup  III
HS Code  2921420090
REACH Registrations Active
NFPA 704
0
2 0

2-Aminotoluene-5-sulfonic acid price More Price(33)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich T332895 6-AMINOTOLUENE-3-SULFONIC ACID AldrichCPR 98-33-9 1 unit $197 2026-04-30 Buy
Sigma-Aldrich T332895 6-AMINOTOLUENE-3-SULFONIC ACID Aldrich 98-33-9 1g $179 2024-03-01 Buy
Biosynth AAA09833 4-Amino-3-methylbenzenesulfonic acid 98-33-9 0.25g $250 2026-06-04 Buy
Biosynth AAA09833 4-Amino-3-methylbenzenesulfonic acid 98-33-9 2.5g $906.25 2026-06-04 Buy
AK Scientific J61885 2-Aminotoluene-5-sulfonic acid 95% 98-33-9 5g $12 2026-06-04 Buy
Product number Packaging Price Buy
T332895 1 unit $197 Buy
T332895 1g $179 Buy
AAA09833 0.25g $250 Buy
AAA09833 2.5g $906.25 Buy
J61885 5g $12 Buy

2-Aminotoluene-5-sulfonic acid Chemical Properties, Uses, Production

Description

2-Aminotoluene-5-sulfonic acid is prepared from o-toluidine and 98 % H2SO4 via the sulfate, which is then baked. The sodium salt can be isolated after liming and precipitation of calcium sulfate. The solution can be used directly in the manufacture of dyes.

Physical properties

White to Pale-yellow to Yellow-brown Sticky Oil to Semi-Solid.

Uses

2-Aminotoluene-5-sulfonic acid is used as a dye intermediate.

Flammability and Explosibility

Not classified

2-Aminotoluene-5-sulfonic acid Preparation Products And Raw materials

Raw materials

Diphenyl sulfone o-Toluidine 3-Hydroxy-2-naphthoic acid 2-Aminonaphthalene-1-sulfonic acid

Preparation Products

DIRECT ORANGE 118 Acid Brown 2 Acid orange 8 trisodium 4-hydroxy-7-[[[[5-hydroxy-7-sulphonato-6-[(o-tolyl)azo]-2-naphthyl]amino]carbonyl]amino]-3-[(2-methyl-4-sulphonatophenyl)azo]naphthalene-2-sulphonate disodium 7-(benzoylamino)-4-hydroxy-3-[[3-methyl-4-[(2-methyl-4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate
disodium hydrogen bis[4-[[2,6-dihydroxy-3-[(2-hydroxy-3,5-dinitrophenyl)azo]phenyl]azo]-3- methylbenzenesulphonato(3-)]chromate(3-) 2-Hydroxy-5-[(2-methyl-4-sulfophenyl)azo]benzoic acid disodium salt DIRECT RED 24

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2-Aminotoluene-5-sulfonic acid Suppliers

Global Suppliers ( 216)
Supplier Tel Email Country ProdList Advantage
J & K SCIENTIFIC LTD. 18210857532 18210857532 jkinfo@jkchemical.com China 96815 76
Alfa Aesar 400-6106006 saleschina@alfa-asia.com China 30103 84
TAIYUAN RHF CO.,LTD. +86 351 7031519 sales@RHFChem.com China 2334 56
Energy Chemical 400-0056266 sales8178@energy-chemical.com China 44850 61
Pure Chemistry Scientific Inc. 001-857-928-2050 or 1-888-588-9418 sales@chemreagents.com United States 10174 62
Shanghai Longsheng chemical Co.,Ltd. 58099637 13585536065 sales@shlschem.com China 9880 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 6743 52
China Langchem Inc. 0086-21-58956006 China 7798 57
Tianjin heowns Biochemical Technology Co., Ltd. 400 638 7771 sales@heowns.com China 14412 57
Supplier Advantage
J & K SCIENTIFIC LTD. 76
Alfa Aesar 84
TAIYUAN RHF CO.,LTD. 56
Energy Chemical 61
Pure Chemistry Scientific Inc. 62
Shanghai Longsheng chemical Co.,Ltd. 59
Shanghai Hanhong Scientific Co.,Ltd. 64
XiaoGan ShenYuan ChemPharm co,ltd 52
China Langchem Inc. 57
Tianjin heowns Biochemical Technology Co., Ltd. 57

View Latest Price from 2-Aminotoluene-5-sulfonic acid manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
2-Aminotoluene-5-sulfonic acid pictures 2026-09-11 2-Aminotoluene-5-sulfonic acid
98-33-9
 1KG 98%min 30tons/month WUHAN FORTUNA CHEMICAL CO., LTD
2-Aminotoluene-5-sulfonic acid pictures 2026-08-20 2-Aminotoluene-5-sulfonic acid
98-33-9
 $1.10 1g 99.00% 100 Tons Min Dideu Industries Group Limited
2-Aminotoluene-5-sulfonic acid pictures 2026-05-28 2-Aminotoluene-5-sulfonic acid
98-33-9
 $10.00-30.00 10kg 99% 100000kg Hebei Chuanghai Biotechnology Co,.LTD

2-Aminotoluene-5-sulfonic acid Spectrum

2-Aminotoluene-5-sulfonic acid(98-33-9)MS2-Aminotoluene-5-sulfonic acid(98-33-9)1HNMR2-Aminotoluene-5-sulfonic acid(98-33-9)13CNMR2-Aminotoluene-5-sulfonic acid(98-33-9)IR12-Aminotoluene-5-sulfonic acid(98-33-9)IR2

98-33-9 (2-Aminotoluene-5-sulfonic acid) Related Search:

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Sulfamic acid 4-Amino-3-methylphenol Nickel bis(sulphamidate) Ethyl 2-(Chlorosulfonyl)acetate Sulfanilic acid
6-Aminopyridine-2-carboxylic acid 2-Aminopyrimidine-5-carboxylic acid Sodium p-toluenesulfonate 2-Amino-pyrimidine-5-carboxylic acid ethyl ester Indigo Carmine
Acid yellow 54 o-Toluidine-4-sulfonic acid sodium salt Acid orange 8

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2-AMINOTOLUENE-5-SULFONIC ACID 2-TOLUIDINE-5-SULFONIC ACID 4-AMINO-M-TOLUENESULFONIC ACID 6-AMINOTOLUENE-3-SULFONIC ACID 4-amino-3-methyl-benzenesulfonicaci o-Toluidine-4-sulfphonicacid 3-methylsulphanilic acid ORTHO TOLUIDINE META SULFO NIC ACID (OTMSA) 2-AMINOTOLUENE-5-SULFONIC ACID 97% 2-Amino-5-sulfotoluene 2-Methyl-4-sulfoaniline 4-Amino-3-methyl-1-sulfobenzene 3-Methyl-4-aminobenzene-1-sulfonic acid 4-Amino-3-methylbenzene-1-sulfonic acid o-Toluidine-4-sulfonic acid 4-Amino-3-methylbenzenesulphonic acid 2-Amino-5-sulphotoluene, 2-Methyl-4-sulphoaniline Benzenesulfonic acid,4-amino-3-methyl- o-Toluidine-4-sulfonic acid (NH2=1) 2 AMINO TOLUNE 5 SULPHONIC ACID 4-amino-3-methylbenzenesulfonate 2-Aminotoluene-5-sulfonic acid ISO 9001：2015 REACH 2-Aminotoluene-5-suofonic acid 2-Aminotoluene-5-sulfoni 6-Amino-m-toluensulfonic acid TIANFU-CHEM 2-Aminotoluene-5-sulfonic acid 98-33-9 OT5SA (3-METHYLSULPHANILIC ACID) Ortho Toluidine 5 Sulfonic Acid (OTS)/2-Aminotoluene-5-sulfonic acid 2-Methylaniline-4-sulfonamide 4-AMINO-3-METHYLBENZENESULFONIC ACID OTS O-TOLUIDINE-P-SULPHONIC ACID 98-33-9 C7H9O3SN C7H8NO3S Building Blocks Organic Building Blocks Sulfonic/Sulfinic Acids Sulfur Compounds Intermediates of Dyes and Pigments