| Identification | More | [Name]
6-Amino-1-naphthalenesulfonic acid | [CAS]
81-05-0 | [Synonyms]
2-AMINO-5-NAPHTHALENESULFONIC ACID
2-AMINONAPHTHALENE-5-SULFONIC ACID
2-NAPHTHYLAMINE-5-SULFONIC ACID
6-AMINO-1-NAPHTHALENESULFONIC ACID
BETA-NAPHTHYLAMINE-5-SULFONIC ACID
D ACID
DAHL'S ACID
1-Naphthalenesulfonicacid,6-amino-
2-Naphthylamine-5-sulfonicaci
6-Aimino-1-naphthalenesulfonicacid
6-aminonaphthalene-1-sulphonic acid
6-aminonaphthalene-1-sulfonic acid
6-AMINO-1-NAPHTHALENESULFONIC ACID, 98+% | [EINECS(EC#)]
201-318-4 | [Molecular Formula]
C10H9NO3S | [MDL Number]
MFCD00035724 | [Molecular Weight]
223.25 | [MOL File]
81-05-0.mol |
| Chemical Properties | Back Directory | [density ]
1.3588 (rough estimate) | [refractive index ]
1.6500 (estimate) | [storage temp. ]
under inert gas (nitrogen or Argon) at 2–8 °C | [form ]
powder to crystal | [pka]
-0.33±0.40(Predicted) | [color ]
White to Light yellow to Light red | [Water Solubility ]
0.33g/L(20 ºC) | [Merck ]
6407 | [CAS DataBase Reference]
81-05-0(CAS DataBase Reference) |
| Hazard Information | Back Directory | [Chemical Properties]
2-Aminonaphthalene-5-sulfonic acid [81-05-0]. (6-aminonaphthalene-1-sulfonic acid), Dahl’s acid, Dressel acid, D acid, C10H9NO3S, Mr 223.24, crystallizes from water as needles although only 0.4 % soluble at 100℃. The sodium, calcium, and barium salts are moderately soluble in water. Bromination in acetic acid gives the 1-bromo derivative. Sulfonation with oleum gives a mixture of 2-aminonaphthalene-5,7-disulfonic acid together with some 1,5-disulfonic acid. Fusion with potassium hydroxide at 260℃ yields 6-amino-1-naphthol. | [Production Methods]
Tobias acid is added to a mixture of sulfuric acid and oleum, and the reaction is completed by stirring for 12 h at 25℃. The resulting sulfonation mass, containing mainly 2-aminonaphthalene-1,5-disulfonic acid, is poured into water and heated at 105℃ for 3 h to desulfonate and precipitate the product which, after cooling, is filtered off; the yield is 95 %. |
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