| Identification | More | [Name]
1-Amino-8-naphthol-4,6-disulfonic acid | [CAS]
130-23-4 | [Synonyms]
1 AMINO 8 HYDROXY 4:6 DISULFONIC ACID
1-AMINO-8-NAPHTHOL-4,6-DISULFONIC ACID
EUROPEAN K-ACID
K ACID
4-amino-5-hydroxynaphthalene-1,7-disulfonic acid
4-amino-5-hydroxynaphthalene-1,7-disulphonic acid
1-amino-8-naphtho-4,6-Disulfonic acid
1-Amino-8-Naphthol-4￡6-disulfonic acid/European K Acid
8-AMINO-1-NAPHTHOL-3,5-DISULFONIC ACID
4-Amino-5-hydroxy-1,7-naphthalenedisulfonic acid
4-Amino-5-naphthol-1,7-disulfonic acid
KACID(1-AMINO-8NAPHTHO-4,6-DISULFONICACID) | [EINECS(EC#)]
204-982-3 | [Molecular Formula]
C10H9NO7S2 | [MDL Number]
MFCD00035711 | [Molecular Weight]
319.31 | [MOL File]
130-23-4.mol |
| Hazard Information | Back Directory | [Chemical Properties]
1-Amino-8-hydroxynaphthalene-4,6-disulfonic acid [130-23-4]. (4-amino-5-hydroxynaphthalene-1,7-disulfonic acid), K acid, C10H9NO7S2, Mr 319.3: the acid sodium salt of 1-Amino-8-hydroxynaphthalene-4,6-disulfonic acid is very soluble in water, but the acid potassium salt is less soluble and is more easily salted out. K acid couples under acid and alkaline conditions in a similar manner to H acid. | [Production Methods]
1-Aminonaphthalene-4,6,8-trisulfonic acid paste is heated with sodium hydroxide liquor in an autoclave at 170℃ for 12 h, after which the mixture is added to excess dilute hydrochloric acid. After heating to remove sulfur dioxide, the product (including ca. 8 % of the isomeric 5-amino-2-hydroxynaphthalene-4,8-disulfonic acid) is completely precipitated by cooling and is isolated in 86 % yield. Purification of crude K acid may be effected by dissolving it in aqueous alkali and filtering off the less soluble 5,2,4,8-isomer before reprecipitating. | [Flammability and Explosibility]
Notclassified |
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