| Identification | Back Directory | [Name]
1-AMINO-2-NAPHTHALENESULFONIC ACID | [CAS]
81-06-1 | [Synonyms]
O-NAPHTHIONIC ACID
ONZWNZGVZFLMNZ-UHFFFAOYSA-N
1,2-Naphthylaminesulfonic acid
α-Naphthylamine-2-sulfonic acid
1-NAPHTHYLAMINE-2-SULFONIC ACID
1-aminonaphthalene-2-sulfonicaci
1-amino-2-naphthalenesulfonicaci
1-aminonaphthalene-2-sulfonic acid
1-AMINO-2-NAPHTHALENESULFONIC ACID
1-azanylnaphthalene-2-sulfonic acid
1-NAPHTHYLAMINE-2-SULFONIC ACID 98%
1-aminonaphthalene-2-sulphonic acid
2-Naphthalenesulfonic acid, 1-amino-
1-AMINO-2-NAPHTHALENESULFONIC ACID ISO 9001：2015 REACH | [EINECS(EC#)]
201-320-5 | [Molecular Formula]
C10H9NO3S | [MDL Number]
MFCD00021545 | [MOL File]
81-06-1.mol | [Molecular Weight]
223.25 |
| Hazard Information | Back Directory | [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. |
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