4-hydroxynaphthalene-2-sulphonic acid
- CAS No.
- 3771-14-0
- Chemical Name:
- 4-hydroxynaphthalene-2-sulphonic acid
- Synonyms
- 4-Hydroxy-2-naphthalenesulfonic acid;4-hydroxynaphthalene-2-sulfonic acid;4-hydroxynaphthalene-2-sulphonic acid;2-Naphthalenesulfonic acid, 4-hydroxy-
- CBNumber:
- CB9936414
- Molecular Formula:
- C10H8O4S
- Molecular Weight:
- 224.23
- MDL Number:
- MFCD00021505
- MOL File:
- 3771-14-0.mol
| Density | 1.549±0.06 g/cm3(Predicted) |
|---|---|
| pka | 0.15±0.40(Predicted) |
| EPA Substance Registry System | 2-Naphthalenesulfonic acid, 4-hydroxy- (3771-14-0) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |   GHS05,GHS07 |
|---|---|
| Signal word | Danger |
| Hazard statements | H302-H315-H314 |
| Precautionary statements | P260-P264-P270-P280-P301+P330+P331-P302+P352-P303+P361+P353-P304+P340-P305+P351+P338-P310-P332+P313-P362-P405-P501 |
4-hydroxynaphthalene-2-sulphonic acid Chemical Properties,Uses,Production
Chemical Properties
1-Hydroxynaphthalene-3-sulfonic acid [3771-14-0]. (4-hydroxynaphthalene-2- sulfonic acid), C10H8O4S, Mr 224.2, and its salts are very soluble in water. Coupling with diazo compounds occurs in the 2-position with weak diazo compounds, but in the 4-position with strong diazo compounds such as diazotized nitroanilines. Heating with ammonia at 170℃ gives 1,3-naphthalenediamine.
Uses
1-Hydroxynaphthalene-3-sulfonic acid is used as a coupling component for the production of direct dyes.
Preparation
1-Aminonaphthalene-3-sulfonic acid is heated with dilute sulfuric acid by using high-pressure steam to maintain a pressure of 1 MPa for 20 h. After cooling, screening, and adding salt to the hot liquor, the sodium salt crystallizes on cooling and is isolated in 80 % yield.
4-hydroxynaphthalene-2-sulphonic acid Preparation Products And Raw materials
Raw materials
Preparation Products
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Hubei Jusheng Technology Co.,Ltd. | 18871490254 | linda@hubeijusheng.com | CHINA | 28180 | 58 |
| LEAPCHEM CO., LTD. | +86-852-30606658 | market18@leapchem.com | China | 43348 | 58 |
| Carbott PharmTech Inc. | 0535-6385396 | info@carbottpharm.com | China | 870 | 56 |
| Shanghai Haohong Pharmaceutical Co., Ltd. | 400-400-8210725 4008210725 | malulu@leyan.com | China | 55023 | 58 |
| Bide Pharmatech Ltd. | 400-1647117 15221909166 | product02@bidepharm.com | China | 61720 | 58 |
| Shaoyuan Technology (Shanghai) Co., Ltd. | 021-50795510 4000665055 | sy-c5@accelachem.com | China | 10368 | 58 |