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81-11-8

4,4'-Diamino-2,2'-stilbenedisulfonic acid

CAS: 81-11-8

Molecular Formula: C14H14N2O6S2

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81-11-8 - Names and Identifiers

Name 4,4'-Diamino-2,2'-stilbenedisulfonic acid
Synonyms diaminostilbenedisulfonicacid
4,4-Diamino-2,2-stilbenedisulfonic acid
4,4'-Diamino-2,2'-stilbenedisulfonic acid
4,4-Diaminodiphenylethylene-2,2-disulfonic acid
4,4'-Diaminodiphenylethylene-2,2'-disulfonic acid
CAS 81-11-8
EINECS 201-325-2
InChI InChI=1/C14H14N2O6S2/c15-11-5-3-9(13(7-11)23(17,18)19)1-2-10-4-6-12(16)8-14(10)24(20,21)22/h1-8H,15-16H2,(H,17,18,19)(H,20,21,22)

81-11-8 - Physico-chemical Properties

Molecular FormulaC14H14N2O6S2
Molar Mass370.40
Density1.662g/cm3
Melting Point>325℃
Water Solubility<0.1 g/100 mL at 23℃
AppearanceForm Crystalline Powder, color cream to yellow-brown
pKa-1.58±0.50(Predicted)
Storage ConditionKeep in dark place,Inert atmosphere,Room temperature
StabilityStable. Combustible. Incompatible with iron, strong oxidizing agents.
Refractive Index1.726
MDLMFCD00024946
Physical and Chemical Properties

Melting Point:>325

water-soluble:<0.1g/100 mL at 23 C

Appearance: yellowish, fine needle-like

UseFor the production of fluorescent whitening agents, direct Frozen Yellow G and direct yellow R, and used as pesticides

81-11-8 - Risk and Safety

Hazard SymbolsC - Corrosive
Corrosive
Risk CodesR34 - Causes burns
Safety DescriptionS22 - Do not breathe dust.
S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection.
S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
UN IDsUN 2583
RTECSWJ6603000
TSCAYes
HS Code29215900

81-11-8 - Upstream Downstream Industry

Raw Materials4-Nitrotoluene
Downstream ProductsFluorescent brightener No.31
Direct Yellow 12
Fluorescent Brightener BC
Fluorescent brightener 85
fluorescent whitening agent PRS
Fluorescent Brightener VBU
FLUORESCENT BRIGHTENER 28
fluorescent whitening agent JD-3
fluorescent bleaches BR
fluorescent whitening agent DMS
Direct Blending Yellow D-3RNL
Reactive Yellow 179
fluorescent whitening agent RA
Direct Blending Brilliant Red D-5BL
fluorescent whitening agent SBA
Reactive Yellow 84
Reactive Yellow KE-4RN
fluorescent bleaches R
Reactive Yellow KE-RN
PROCION YELLOW H-E3G
Direct Red Brown RN
Reactive Red KD-8B
Reactive Orange KE-2G
Direct Red 227

81-11-8 - Application

Open Data Verified Data

mainly used in the manufacture of fluorescent whitening agent, direct Frozen Yellow G, direct yellow R, sun-resistant orange F3 G and insect repellent.

Last Update：2025-08-19 16:24:40

81-11-8 - Safety

Open Data Verified Data
  • toxic, irritating to the skin. Should Avoid ingestion, avoid direct contact with the human body. Operators should wear labor protection equipment.
  • the container is packed in a plastic bag lined with a barrel or an iron drum. 50kg per barrel. Storage in a cool, ventilated warehouse, sealed storage. Storage period of half a year. According to the provisions of the storage and transportation of toxic chemicals.
Last Update：2025-06-10 22:55:16

81-11-8 - Nature

Merck 14,595
BRN 629516
EPA chemical information Amsonic acid (81-11-8)
Last Update：2024-04-10 22:29:15

81-11-8 - Production method

it is formed by sulfonation of p-nitrotoluene to p-nitrotoluene o-sulfonic acid, then catalytic oxidation to 4,4 '-dinitrostilbene disulfonic acid, and then reduction.

Last Update：2024-04-10 22:29:15
81-11-8
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Shanghai Xin Cheng Yue Chemical Co.,Ltd
Featured ProductsSpot supply
Product Name: DSD Acid Request for quotation
CAS: 81-11-8
Tel: 012-58702786
Email: wuziwei@xinyuefirm.com
Mobile: +65 88706262
QQ: 390909492 Click to send a QQ message
Wechat: 18915723261
WhatsApp: +65 88706262
Linkedin: https://www.linkedin.com/company/superchem-pt
Shanghai Macklin Biochemical Co., Ltd
Featured ProductsSpot supply
Product Name: 4,4'-Diamino-2,2'-stilbenedisulfonic acid Visit Supplier Webpage Request for quotation
CAS: 81-11-8
Tel: +86-18821248368
Email: Int06@meryer.com
Mobile: +86-18821248368
QQ: 495145328 Click to send a QQ message
WhatsApp: +86-18821248368
Anhui Royal Chemical Co.,Ltd.
Spot supply
Product Name: DSD ACID Request for quotation
CAS: 81-11-8
Tel: +86 02586655873
Email: marketing@royal-chem.com
Mobile: 02586655873
QQ: 756132483 Click to send a QQ messageSend QQ message
JIANGSU BSECHEM CHEMICAL TECHNOLOGY CO., LTD.
Spot supply
Product Name: 4,4'-Diamino-2,2'-stilbenedisulfonic acid Request for quotation
CAS: 81-11-8
Tel: +86-17505207175
Email: 3787852685@qq.com
Mobile: +86-17505207175
QQ: 3787852685 Click to send a QQ message
Wechat: chemical6666
Nantong Reform Petro-Chemical CO., LTD.
Spot supply
Product Name: 4,4'-Diamino-2,2'-stilbenedisulfonic acid Request for quotation
CAS: 81-11-8
Tel: +86-13776910623
Email: r@reformchem.com­
Mobile: +86-13776910623
QQ: 3785839865 Click to send a QQ messageSend QQ message
Wechat: chemical6666 
Guangzhou Yuanda New Material Co.,Ltd
Multiple Specifications
Product Name: 4,4'-Diamino-2,2'-stilbenedisulfonic acid Request for quotation
CAS: 81-11-8
Tel: +86 19849939632
Email: 2470479589@qq.com
Mobile: +86 19849939632
QQ: 2470479589 Click to send a QQ message
Shanghai Amole Biotechnology Co., Ltd.
Spot supply
Product Name: 4,4'-Diamino-2,2'-stilbenedisulfonic acid Request for quotation
CAS: 81-11-8
Tel: 400-968-2212
Email: 3623107365@qq.com
Mobile: 18916960931
QQ: 3623107365 Click to send a QQ message
Wechat: 18916960931
Changsha Changtang import and Export Co., Ltd.
Product Name: 4,4'-Diaminodiphenylethylene-2,2'-disulfonic acid Request for quotation
CAS: 81-11-8
Tel: +86 18942506900
Email: lilyqu@chemoway.com
Mobile: +86 18942506900
QQ: 3182628472 Click to send a QQ message
Wechat: +86 18942506900
WhatsApp: +86 18942506900
Linkedin: +86 18942506900
SHANGHAI ACMEC BIOCHEMICAL TECHNOLOGY CO., LTD.
Spot supply
Product Name: 4,4'-Diamino-2,2'-stilbenedisulfonic acid Visit Supplier Webpage Request for quotation
CAS: 81-11-8
Tel: +86-400-900-4166
Email: product@acmec-e.com
Mobile: +86-18621343501
QQ: 2881950922 Click to send a QQ message
Wechat: 18621343501
WhatsApp: +86-18621343501
Hefei TNJ Chemical Industry Co.,Ltd.
Product Name: 4,4'-Diaminodiphenylethylene-2,2'-disulfonic acid Request for quotation
CAS: 81-11-8
Tel: 0086-551-65418684
Email: sales@tnjchem.com
　　　　 info@tnjchem.com
Mobile: 0086 189 4982 3763
QQ: 2881500840 Click to send a QQ message
Wechat: 189 4982 3763
WhatsApp: 0086 189 4982 3763
Product List: View Catalog
View History
81-11-8
2679-87-0
3507-63-9
triphenylbismuth
193353-34-3
55650-58-3
118431-89-3
10049-01-1
38004-59-0
1823-63-8
Raw Materials for 81-11-8
4-Nitrotoluene
Downstream Products for 81-11-8
Fluorescent brightener No.31
Fluorescent Brightener BC
FLUORESCENT BRIGHTENER 28
Direct Blending Yellow D-3RNL
Reactive Yellow 179
fluorescent whitening agent RA
Reactive Yellow 84
fluorescent bleaches R
Reactive Yellow KE-RN
PROCION YELLOW H-E3G
Reactive Red KD-8B
Direct Red 227
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