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1-AMINO-2-NAPHTHALENESULFONIC ACID

1-AMINO-2-NAPHTHALENESULFONIC ACID Structure
CAS No.
81-06-1
Chemical Name:
1-AMINO-2-NAPHTHALENESULFONIC ACID
Synonyms
O-NAPHTHIONIC ACID;ONZWNZGVZFLMNZ-UHFFFAOYSA-N;1,2-Naphthylaminesulfonic acid;α-Naphthylamine-2-sulfonic acid;1-NAPHTHYLAMINE-2-SULFONIC ACID;1-amino-2-naphthalenesulfonicaci;1-aminonaphthalene-2-sulfonicaci;1-AMINO-2-NAPHTHALENESULFONIC ACID;1-aminonaphthalene-2-sulfonic acid;1-NAPHTHYLAMINE-2-SULFONIC ACID 98%
CBNumber:
CB8781833
Molecular Formula:
C10H9NO3S
Molecular Weight:
223.25
MOL File:
81-06-1.mol
Modify Date:
2024/12/18 14:15:30

1-AMINO-2-NAPHTHALENESULFONIC ACID Properties

Density 1.3588 (rough estimate)
refractive index 1.6500 (estimate)
pka pK1: 1.71 (25°C)
Water Solubility 4.1g/L(20 ºC)
EPA Substance Registry System 2-Naphthalenesulfonic acid, 1-amino- (81-06-1)

1-AMINO-2-NAPHTHALENESULFONIC ACID Chemical Properties,Uses,Production

Chemical Properties

1-Aminonaphthalene-2-sulfonic acid [81- 06-1]. ortho-naphthionic acid, C10H9NO3S, Mr 223.24, mp 262 – 265℃ (decomp.), is sparingly soluble in cold water but dissolves in hot water to give a 3 % solution. The sodium salt is more readily soluble in water (1.7 % at 20℃ and 10 % at 100℃). The calcium salt is similarly soluble, but the barium salt is almost insoluble.

Production Methods

1-Naphthylamine can be sulfonated by heating with sulfuric acid at 180 – 185℃, but the transient intermediate naphthalene-1-sulfamic acid is best prepared from 1-aminonaphthalene-4-sulfonic acid (naphthionic acid). When sodium naphthionate is heated in a solvent such as o-dichlorobenzene or xylene at 225℃, thermal rearrangement occurs to give the 1,2-isomer in high yield.

1-AMINO-2-NAPHTHALENESULFONIC ACID Preparation Products And Raw materials

Raw materials

Preparation Products

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1-amino-2-naphthalenesulfonicaci 1,2-Naphthylaminesulfonic acid α-Naphthylamine-2-sulfonic acid 1-azanylnaphthalene-2-sulfonic acid O-NAPHTHIONIC ACID 1-AMINO-2-NAPHTHALENESULFONIC ACID 1-NAPHTHYLAMINE-2-SULFONIC ACID 1-aminonaphthalene-2-sulphonic acid 1-aminonaphthalene-2-sulfonic acid 1-NAPHTHYLAMINE-2-SULFONIC ACID 98% ONZWNZGVZFLMNZ-UHFFFAOYSA-N 2-Naphthalenesulfonic acid, 1-amino- 1-aminonaphthalene-2-sulfonicaci 1-AMINO-2-NAPHTHALENESULFONIC ACID ISO 9001:2015 REACH 81-06-1 1981-06-1