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1-Hydroxynaphthalene-7-sulfonic acid

1-Hydroxynaphthalene-7-sulfonic acid structure

CAS No.: 20191-62-2

Chemical Name:: 1-Hydroxynaphthalene-7-sulfonic acid

Synonyms: 1-Hydroxynaphthalene-7-sulfonic acid;2-Naphthalenesulfonic acid, 8-hydroxy-

CBNumber:: CB42506742

Molecular Formula:: C10H8O4S

Molecular Weight:: 224.23

MDL Number:

MOL File:: 20191-62-2.mol

Last updated:2023-11-01 14:21:38

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1-Hydroxynaphthalene-7-sulfonic acid Properties

Density	1.549±0.06 g/cm3(Predicted)
pka	0.39±0.40(Predicted)

1-Hydroxynaphthalene-7-sulfonic acid Chemical Properties,Uses,Production

Chemical Properties

1-Hydroxynaphthalene-7-sulfonic acid [20191-62-2]. (8-hydroxynaphthalene-2- sulfonic acid), C10H8O4S, Mr 224.2, is very soluble in water, and most of its metal salts are also readily soluble. It couples with diazotized 4- nitroaniline to give the 2,4-disazo compound. Nitration gives 2,4-dinitro-1-naphthol-7-sulfonic acid, which was known as Flavianic acid when used as a yellow dye for wool.

Synthesis

1-Naphthol is sulfonated with concentrated sulfuric acid at 130℃ to give a mixture of 2,7- and 4,7-disulfonic acids. This mixture is difficult to separate, but dilution with water and heating the resulting dilute sulfuric acid solution at 120℃ for 30 min result in selective desulfonation in the 2- and 4-positions.
1-Hydroxynaphthalene-7-sulfonic acid synthesis

1-Hydroxynaphthalene-7-sulfonic acid Preparation Products And Raw materials

Raw materials

Preparation Products

1-Hydroxynaphthalene-7-sulfonic acid Suppliers

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1-Hydroxynaphthalene-7-sulfonic acid 2-Naphthalenesulfonic acid, 8-hydroxy- 20191-62-2