1-AMINO-2-NAPHTHALENESULFONIC ACID
- CAS NO.:81-06-1
- Empirical Formula: C10H9NO3S
- Molecular Weight: 223.25
- MDL number: MFCD00021545
- EINECS: 201-320-5
- SAFETY DATA SHEET (SDS)
- Update Date: 2023-11-02 15:01:55
What is 1-AMINO-2-NAPHTHALENESULFONIC ACID?
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.
Properties of 1-AMINO-2-NAPHTHALENESULFONIC ACID
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) |
Safety information for 1-AMINO-2-NAPHTHALENESULFONIC ACID
Computed Descriptors for 1-AMINO-2-NAPHTHALENESULFONIC ACID
New Products
(R)-tert-butyl (4-methyl-1-oxopentan-3-yl)carbamate Tubulysin C Tubulysin D Tubulysin A Tubulysin B 4,4-DIFLUOROPIPERIDINE 3-FLUOROPYRROLIDINE HYDROCHLORIDE 4-CYANO-TETRAHYDROPYRAN-4-CARBOXYLIC ACID 1-(1,1-Difluoroethyl)-2-fluorobenzene 1,2,3,6-TETRAHYDROPYRIDINE HYDROCHLORIDE 2H-Pyran, 4-ethynyltetrahydro- Calcium Sodium Phosphosilicate IH Fuel shell (1R,2S)-2-(3,4-Difluorophenyl)cyclopropanamine 2-[2-[3(S)-3[2-(7-chloro-2-quinolinyl) ethenyl] phenyl-3- hydroxyl propyl] phenyl]-2-propanol 2-[[(3aR,4S,6R,6aS)-6-Aminotetrahydro-2,2-dimethyl-4H-cyclopenta-1,3-dioxol-4-yl]oxy]ethanol ethanedioate 2-(1-(Mercaptomethyl) cyclopropyl) acetonitrile Latanoprostene Bunod Lubiprostone Magnesium Trisilicate Flame Retardant Zinc Borate (R)-(3-(3-fluoro-4- thiomorpholinophenyl)-2- oxooxazolidin-4-yl) methyl methanesulfonate methyl 3-fluoro-4- thiomorpholino phenylcarbamate 1H-Imidazole-4-carbonitrileRelated products of tetrahydrofuran
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