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: 2024-12-18 14:15:30
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
(S)-3-Aminobutanenitrile hydrochloride 4-Methylphenylacetic acid N-Boc-D-alaninol N-BOC-D/L-ALANINOL Tert-butyl bis(2-chloroethyl)carbamate 3-Morpholino-1-(4-nitrophenyl)-5,6-dihydropyridin- 2(1H)-one Furan-2,5-Dicarboxylic Acid Tropic acid 1-Bromo-3,5-Di-Tert-Butylbenzene S-2-CHLORO PROPIONIC ACID ETHYL ISOCYANOACETATE 2-Bromo-1,3-Bis(Dimethylamino)Trimethinium Hexafluorophosphate 4-IODO BENZOIC ACID 3-NITRO-2-METHYL ANILINE 1-(2,4-DICHLOROPHENYL) ETHANAMINE (2-Hydroxyphenyl)acetonitrile 4-Bromopyrazole 2-(Cyanocyclohexyl)acetic acid 4-methoxy-3,5-dinitropyridine 1-(4-(aminomethyl)benzyl)urea hydrochloride 2-aminopropyl benzoate hydrochloride diethyl 2-(2-((tertbutoxycarbonyl)amino) ethyl)malonate tert-butyl 4- (ureidomethyl)benzylcarbamate Ethyl-2-chloro((4-methoxyphenyl)hydrazono)acetateRelated products of tetrahydrofuran
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