| Identification | More | [Name]
6-Amino-4-hydroxy-2-naphthalenesulfonic acid | [CAS]
90-51-7 | [Synonyms]
2-AMINO-8-NAPHTHOL-6-SULFONIC ACID
6-AMINO-4-HYDROXY-2-NAPHTHALENESULFONIC ACID
6-AMINO-4-NAPHTHOL-2-SULFONIC ACID
7-AMINO-1-HYDROXY-3-SULFONAPHTHALENE
7-AMINO-1-NAPHTHOL-3-SULFONIC ACID
GAMMA ACID
2-Naphthalenesulfonicacid,6-amino-4-hydroxy-
6-amino-4-hydroxy-2-naphthalenesulfonicaci
6-Amino-4-hydroxynaphthalene-2-sulfonicacid
7-amino-1-naphthol-3-sulfonicaci
aminonaphtholsulfonicacidgamma
c.i.developer3
yacid
6-amino-4-hydroxynaphthalene-2-sulphonic acid
Galmarine(silymarine soluble)
2-Amino-8-hydroxynaphthalene-6-sulfonic acid
6-AMINO-4-HYDROXY-2-NAPHTHALENE-SULPHONICACID
6-Amino-4-hydroxy-2-naphthalinsulfonsure
6-AMINO-4-HYDROXY-2-NAPHTHALENESULFONIC ACID (GAMMA ACID)
2-AMINO-8-NAPTHOL-6-SULFONIC ACID | [EINECS(EC#)]
202-000-8 | [Molecular Formula]
C10H9NO4S | [MDL Number]
MFCD00003973 | [Molecular Weight]
239.25 | [MOL File]
90-51-7.mol |
| Chemical Properties | Back Directory | [Boiling point ]
458℃[at 101 325 Pa] | [density ]
1.4338 (rough estimate) | [vapor pressure ]
0Pa at 25℃ | [refractive index ]
1.6500 (estimate) | [storage temp. ]
Keep in dark place,Sealed in dry,Room Temperature | [form ]
powder to crystal | [pka]
-0.20±0.40(Predicted) | [color ]
White to Gray to Brown | [Water Solubility ]
4.5g/L(hot water) | [InChIKey]
HBZVNWNSRNTWPS-UHFFFAOYSA-N | [LogP]
-1.39 | [CAS DataBase Reference]
90-51-7(CAS DataBase Reference) | [EPA Substance Registry System]
90-51-7(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
C | [Risk Statements ]
R34:Causes burns. | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S27:Take off immediately all contaminated clothing .
S28:After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer) .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) . | [RIDADR ]
UN 2585 8/PG 3
| [WGK Germany ]
1
| [RTECS ]
QK1295250
| [HS Code ]
2922.21.5000 | [Toxicity]
LD50 intraperitoneal in mouse: > 500mg/kg |
| Raw materials And Preparation Products | Back Directory | [Raw materials]
Sodium hydroxide-->Sulfur dioxide-->2-Naphthol-->2-Naphthylamine | [Preparation Products]
disodium 5-((4-acetylamino-2-sulphophenyl)azo)-6-amino-4-hydroxynaphthalene-2-disulphonate-->Direct Grey D-->4-Amino-6-[[4'-[(7-amino-1-hydroxy-3-sulfo-2-naphtyl)azo]-1,1'-biphenyl-4-yl]azo]-5-hydroxy-3-[(4-nitrophenyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt-->C.I. Direct Black 151-->Direct Grey D-->Acid Red 440-->Direct Black 197-->CHLORAZOL BLACK BH-->5-[[2,4-Diamino-5-[(8-hydroxy-6-sodiosulfo-2-naphthalenyl)azo]phenyl]azo]-4-hydroxy-3-[[4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulfonic acid disodium salt-->3-Amino-4-[[4'-[(2-amino-8-hydroxy-6-sodiosulfo-1-naphthalenyl)azo]-1,1'-biphenyl-4-yl]azo]naphthalene-2,7-disulfonic acid disodium salt-->DIRECT BLACK 22-->C.I. Direct Brown 166-->2-Naphthalenesulfonic acid, 6-[[4-amino-6(or 7)-sulfo-1-naphthalenyl]azo]-3-[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-4-hydroxy-, disodium salt-->Glycine, N-[5-amino-4-[2-[4-[2-[[2-(2,4-diamino-5-methylphenyl)diazenyl]hydroxysulfo-2-naphthalenyl]diazenyl]phenyl]diazenyl]-2-methylphenyl]-, sodium salt (1:2)-->ACID RED 266-->disodium 6-amino-5-[(4-amino-2-sulphonatophenyl)azo]-4-hydroxynaphthalene-2-sulphonate |
| Hazard Information | Back Directory | [Chemical Properties]
2-Amino-8-hydroxynaphthalene-6-sulfonic acid [90-51-7]. (6-amino-4-hydroxynaphthalene-2-sulfonic acid), g acid, C10H9NO4S, Mr 239.2, is obtained as white or gray crystals which are only sparingly soluble in water even at 100℃ (0.4%). The sodium salt dissolves readily in water to form solutions that exhibit a blue fluorescence. Coupling with diazo compounds is usually carried out under acid conditions and occurs in the 1-position; coupling in the 7-position can be effected in alkaline solution. | [Uses]
6-Amino-?4-?hydroxy-2-naphthalenesulfonic Acid is used in the synthesis of mono-azo dyes for application towards synthetic fibers. Also used in the synthesis of dyes with high technical properties for silk. | [Production Methods]
2-Aminonaphthalene-6,8-disulfonic acid liquor is added over 16 h to 70 % sodium hydroxide at 190℃, while the water is allowed to evaporate to maintain the temperature. The reaction mixture is then heated for a further 6 h. Completion of the reaction is indicated by a workedup sample giving identical titers for both diazotization and coupling. The batch is diluted with water, acidified, and heated at 75℃ to expel sulfur dioxide. The product is filtered off at 55℃ and washed with warm water; yield is 84 %.
An improved process with 90 % yield is claimed by feeding concentrated 2-aminonaphthalene-6,8-disulfonic acid dipotassium salt liquor and caustic soda liquor simultaneously into the fusion reactor. | [Flammability and Explosibility]
Notclassified |
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