| Identification | More | [Name]
2-Amino-4,8-naphthalenedisulfonic acid | [CAS]
131-27-1 | [Synonyms]
2-NAPHTHYLAMINE-4,8-DISULFONIC ACID
2 NAPHTHYLAMINE 4,8 DISULPHONIC ACID
3-AMINO-1,5-NAPHTHALENEDISULFONIC ACID
AMINO C ACID
C ACID
CASSELLA ACID
2-Ethylamino-4,8-dinaphthalene
2-Ethylamino-4,8-dinaphthalenedisulfonicacid
3-amino-1,5-naphthalenedisulfonic
3-amino-5-naphthalenedisulfonicacid
3-aminonaphthalene-1,5-disulphonicacid
4,8-disulfo-2-naphthalamine
5-Naphthalenedisulfonicacid,3-amino-1
acidiv
beta-naphthylamine-4,8-disulfonicacid
beta-naphthylaminedisulfonicacid
kyselina2-naftylamin-4,8-disulfonova
kyselinac
3-aminonaphthalene-1,5-disulfonic acid
2-Naphthylamine-4,8-Disulphonic Acid (C-Acid) | [EINECS(EC#)]
205-020-5 | [Molecular Formula]
C10H9NO6S2 | [MDL Number]
MFCD00035722 | [Molecular Weight]
303.31 | [MOL File]
131-27-1.mol |
| Chemical Properties | Back Directory | [Boiling point ]
205.8°C (rough estimate) | [density ]
1.6329 (rough estimate) | [refractive index ]
1.7330 (estimate) | [storage temp. ]
Sealed in dry,2-8°C | [pka]
-1.16±0.40(Predicted) | [InChI]
InChI=1S/C10H9NO6S2/c11-6-4-8-7(10(5-6)19(15,16)17)2-1-3-9(8)18(12,13)14/h1-5H,11H2,(H,12,13,14)(H,15,16,17) | [InChIKey]
MTJGVAJYTOXFJH-UHFFFAOYSA-N | [SMILES]
C1(S(O)(=O)=O)=C2C(C(S(O)(=O)=O)=CC=C2)=CC(N)=C1 | [CAS DataBase Reference]
131-27-1(CAS DataBase Reference) | [EPA Substance Registry System]
131-27-1(EPA Substance) |
| Safety Data | Back Directory | [Symbol(GHS) ]
GHS07 | [Signal word ]
Warning | [Hazard statements ]
H302-H315-H319-H335 | [Precautionary statements ]
P261-P264-P270-P271-P280-P301+P312-P302+P352-P304+P340-P305+P351+P338-P330-P332+P313-P337+P313-P362-P403+P233-P405-P501 | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin . | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection . | [Toxicity]
rat,LD50,oral,11400mg/kg (11400mg/kg),"Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1058, 1986. |
| Raw materials And Preparation Products | Back Directory | [Raw materials]
Nitric acid-->FUMING SULFURIC ACID-->Naphthalene-->Magnesium carbonate | [Preparation Products]
Direct Blue 71-->Pigment Red 53:1-->Direct Black 103-->Direct Blending Yellow D-3RNL-->Direct Blend Blue-->Reactive Blue 222-->Reactive Yellow 3-->2-NAPHTHYLAMINE-4,6,8-TRISULFONIC ACID-->Reactive Yeiiow M-3RE-->Reactive Yellow KE-4RN-->Direct Yellow 86-->PROCION BLUE H-5R-->Durazol Brown 4RNS-->Direct black 75 (C.I. 35870)-->1,5-Naphthalenedisulfonic acid, 3-[[4-[[4-[(4-amino-2,5-dimethylphenyl)azo]-6(or 7)-sulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]-, trisodium salt-->1,5-Naphthalenedisulfonicacid,3-[[4-[[4-[(4-amino-5-methoxy-2-methylphenyl)azo]-6(or7)-sulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]-,trisodiumsalt-->tetrasodium 3,3'-[carbonylbis[imino(5-methoxy-2-methyl-4,1-phenylene)azo]]bis(naphthalene-1,5-disulphonate)-->Direct Yellow 86-->Direct Black 103-->DIRECT YELLOW 50 |
| Hazard Information | Back Directory | [Chemical Properties]
2-Aminonaphthalene-4,8-disulfonic acid [131-27-1]. (3-aminonaphthalene-1,5-disulfonic acid), Cassella acid, C acid, C10H9NO6S2, Mr 303.32, and its salts are readily soluble in water. Reduction with sodium amalgam desulfonates 2-Aminonaphthalene-4,8-disulfonic acid to give 2-aminonaphthalene-8-sulfonic acid, whereas boiling with dilute sulfuric acid results in desulfonation and hydrolysis to give 2- hydroxynaphthalene-4-sulfonic acid. Alkali fusion (KOH, 215℃) produces 2-amino-4-hydroxynaphthalene-8-sulfonic acid. | [Uses]
2-Amino-4,8-naphthalenedisulfonic Acid is used in green preparation method of direct blended blue D 3GL. | [Uses]
Cassella acid is an important diazo component for yellow direct and reactive dyes. | [Production Methods]
The iron(II) salt of 3-nitronaphthalene-1,5-disulfonic acid (nitro-Armstrong acid) is reduced with iron in dilute acid. A claimed improvement involves isolation of nitro-Armstrong acid from the nitration products of naphthalene-1,5-disulfonic acid as the crystalline magnesium salt prior to catalytic reduction to C acid. |
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