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J acid

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J acid Basic information

Product Name:
J acid
Synonyms:
  • 7-amino-4-hydroxy-2-naphthalenesulfonicaci
  • kyselina6-amino-1-naftol-3-sulfonova
  • kyselinai
  • 6-amino-1-naphthol-3-sulfonicacid(2-5-7)
  • 2-AMINO-5-HYDROXYNAPHTHALENE-7-SULFONIC ACID
  • 2-AMINO-5-NAPHTHOL-7-SULFONIC ACID
  • 7-AMINO-4-HYDROXY-2-NAPHTHALENESULFONIC ACID
  • 7-amino-4-hydroxy-2-naphthalene sulphonic acid
CAS:
87-02-5
MF:
C10H9NO4S
MW:
239.25
EINECS:
201-718-9
Product Categories:
  • Building Blocks
  • Chemical Synthesis
  • Organic Building Blocks
  • Sulfonic/Sulfinic Acids
  • Sulfur Compounds
  • Azo dyes
  • Intermediates of Dyes and Pigments
  • 87-02-5
Mol File:
87-02-5.mol
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J acid Chemical Properties

Density 
1.4338 (rough estimate)
vapor pressure 
0Pa at 25℃
refractive index 
1.6500 (estimate)
storage temp. 
Keep in dark place,Inert atmosphere,Room temperature
solubility 
Slightly soluble in water
pka
-0.28±0.40(Predicted)
form 
powder
color 
yellow
Water Solubility 
5g/L at 20℃
InChIKey
KYARBIJYVGJZLB-UHFFFAOYSA-N
LogP
-1.39
CAS DataBase Reference
87-02-5(CAS DataBase Reference)
EPA Substance Registry System
7-Amino-4-hydroxy-2-naphthalenesulfonic acid (87-02-5)
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Safety Information

Hazard Codes 
C
Risk Statements 
34
Safety Statements 
26-27-36/37/39
RIDADR 
UN 2585 8/PG 3
WGK Germany 
1
RTECS 
QK1295500
21
HazardClass 
8
PackingGroup 
III
HS Code 
2922190090
Toxicity
LD50 oral in rat: 11500mg/kg

MSDS

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J acid Usage And Synthesis

Chemical Properties

Gray needles, white when pure. Soluble in hot water; sparingly soluble in cold water. 2-Amino-5-hydroxynaphthalene-7-sulfonic acid [87-02-5]. (7-amino-4-hydroxynaphthalene-2-sulfonic acid), J acid, C10H9NO4S, Mr 239.2, is only slightly soluble (0.1 %) in cold water but readily soluble at 100℃. The alkalimetal salts are readily soluble in water. Diazo compounds are normally coupled with J acid under alkaline conditions with reaction in the 6-position (ortho to hydroxyl); however, under acid conditions, coupling can occur in the 1- position. Reaction with bisulfite gives 4,7-dihydroxynaphthalene-2-sulfonic acid. The N-acylation, Nalkylation, and N-arylation reactions are important.

Uses

Azo dye intermediate.

Production Methods

A concentrated disodium salt solution of 2-aminonaphthalene-5,7-disulfonic acid is added to 72 % sodium hydroxide at 150 ℃. After heating to 187℃ over 10 h reaction is continued at this temperature for a further 8 h until completion of the reaction is indicated by giving equivalent diazotization and coupling titers for a worked-up sample. Quenching, acidification, purging of sulfur dioxide, and filtration at 55 ℃ followed by washing with water at 50℃ result in an 88 % yield of paste. Purification by salting out the sodium salt from a hot alkaline solution gives a 90 % recovery of the product as gray crystals. An improved process with 90 % yield is claimed by feeding the concentrated 2-aminonaphthalene-5,7-disulfonic acid liquor and the caustic liquor simultaneously into the fusion reactor to maintain more stable conditions.

Definition

ChEBI: 7-amino-4-hydroxy-2-naphthalenesulfonic acid is an aminonaphthalenesulfonic acid that is 2-naphthalenesulfonic acid substituted by an amino group at position 7 and a hydroxy group at position 4 respectively. It has a role as a metabolite. It is an aminonaphthalenesulfonic acid and a member of naphthols.

Flammability and Explosibility

Not classified

J acidSupplier

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