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HomeProduct name list1-Hydroxynaphthalene-8-sulfonic acid

1-Hydroxynaphthalene-8-sulfonic acid

  • CAS NO.:117-22-6
  • Empirical Formula: C10H8O4S
  • Molecular Weight: 224.23
  • MDL number: MFCD00065328
  • EINECS: 204-180-3
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-05-23 18:06:45
1-Hydroxynaphthalene-8-sulfonic acid Structural

What is 1-Hydroxynaphthalene-8-sulfonic acid?

Chemical properties

1-Hydroxynaphthalene-8-sulfonic acid [117-22-6]. (8-hydroxynaphthalene-1-sulfonic acid), C10H8O4S, Mr 224.2, crystallizes as the monohydrate with mp 106℃. Sulfonation gives 1-hydroxynaphthalene-4,8-disulfonic acid, and alkali fusion with potassium hydroxide at 230℃ yields 1,8-dihydroxynaphthalene. Coupling with diazo compounds occurs in the 2- position.

The Uses of 1-Hydroxynaphthalene-8-sulfonic acid

The naphthosultone is usually satisfactory as an intermediate for further processing; however, for azo dye preparation the free naphthol must be used, for example, in C.I. Acid Black 54 and C.I. Acid Blue 158.

Production Methods

1-Aminonaphthalene-8-sulfonic acid is diazotized over 16 h at 50℃ and then heated to 80 ℃. After cooling, the precipitated naphthosultone is filtered off and washed. The sultone is heated with dilute sodium hydroxide at 100℃, which causes ring opening; the product is isolated after salting out.
	1-Hydroxynaphthalene-8-sulfonic acid synthesis

Properties of 1-Hydroxynaphthalene-8-sulfonic acid

Density  1.549
pka 0.05±0.40(Predicted)
CAS DataBase Reference 117-22-6(CAS DataBase Reference)
EPA Substance Registry System 1-Naphthalenesulfonic acid, 8-hydroxy- (117-22-6)

Safety information for 1-Hydroxynaphthalene-8-sulfonic acid

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H302:Acute toxicity,oral
H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.
P302+P352:IF ON SKIN: wash with plenty of soap and water.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Computed Descriptors for 1-Hydroxynaphthalene-8-sulfonic acid

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