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Name	6-Hydroxynaphthalene-2-sulphonic acid	EINECS	202-209-4
CAS No.	93-01-6	Density	1.549 g/cm³
PSA	82.98000	LogP	2.87290
Solubility	soluble AUTOIGNITION		Melting Point	>300 ºC(lit.)
Formula	C10H8 O4 S	Boiling Point
Molecular Weight	224.237	Flash Point	N/A
Transport Information	25kgs	Appearance	White to gray-yellow powder
Safety	Poison by ingestion. Moderately toxic by subcutaneous route. When heated to decomposition it emits toxic fumes of SO_x. See also SULFONATES.	Risk Codes	36/37/38
Molecular Structure		Hazard Symbols	TSCA listed UN NO.
Synonyms	2-Hydroxy-6-naphthalenesulfonicacid; 2-Naphthol-6-sulfonic acid; 6-Hydroxy-2-naphthalenesulfonic acid; NSC5871; Schaeffer's acid; Schaeffer's b-acid; Schaeffer's b-naphtholsulfonic acid; Schaffer's acid; b-Naphthol-6-sulfonic acid; b-Naphtholsulfonic acid S	Article Data	54

6-Hydroxynaphthalene-2-sulphonic acid Synthetic route

: 135-19-3
β-naphthol

: 93-01-6
2-naphthol-6-sulfonic acid

Conditions

Conditions	Yield
With sulfuric acid
With 1,4-dioxane; sulfur trioxide; 1,2-dichloro-ethane
With chlorosulfonic acid; 1,1,2,2-tetrachloroethane at 100℃;
With sulfuric acid at 80℃; for 6h; Temperature;	128 g

: 80073-10-5
1-acetamino-2-hydroxy-naphthalene-6-sulphonic acid

: 118-28-5
1-amino-2-ethoxy-naphthalene-6-sulphonic acid

: 93-01-6
2-naphthol-6-sulfonic acid

2-hydroxy-naphthalene-disulfonic acid-(1.6): 2-hydroxy-naphthalene-disulfonic acid-(1.6)

: 93-01-6
2-naphthol-6-sulfonic acid

Conditions

Conditions	Yield
With mineral acid

: 80073-10-5
1-acetamino-2-hydroxy-naphthalene-6-sulphonic acid

: 75-00-3
chloroethane

: 118-28-5
1-amino-2-ethoxy-naphthalene-6-sulphonic acid

: 93-01-6
2-naphthol-6-sulfonic acid

Conditions

Conditions	Yield
With potassium hydroxide

: 135-19-3
β-naphthol

A: 132-57-0
7-hydroxy-naphthalene-1-sulfonic acid

B: 93-01-6
2-naphthol-6-sulfonic acid

Conditions

Conditions	Yield
With sulfuric acid
With sulfuric acid

: 135-19-3
β-naphthol

A: 118-32-1
2-naphthol-6,8-disulfonic acid

B: 93-01-6
2-naphthol-6-sulfonic acid

Conditions

Conditions	Yield
With sulfuric acid at 60℃; Trennung ueber mehreren Stufen nach mehreren Verfahren (Trennung der γ-Saeure von der R-Saeure);
With sulfuric acid at 60℃; Trennung ueber mehreren Stufen nach mehreren Verfahren (Trennung der γ-Saeure von der R-Saeure);

2-oxy-naphthoic acid-(1)-sulfonic acid-(6): 2-oxy-naphthoic acid-(1)-sulfonic acid-(6)

: 93-01-6
2-naphthol-6-sulfonic acid

Conditions

Conditions	Yield
With water at 60℃;

potassium-<2-hydroxy-naphthalene sulfonate-(1)>: potassium-<2-hydroxy-naphthalene sulfonate-(1)>

: 93-01-6
2-naphthol-6-sulfonic acid

Conditions

Conditions	Yield
With quartz sand at 200℃;

potassium naphthyl-(2)-sulfate: potassium naphthyl-(2)-sulfate

: 93-01-6
2-naphthol-6-sulfonic acid

Conditions

Conditions	Yield
With potassium hydrogensulfate at 200℃;

: 613-80-9
2,2'-Dinaphthyl ether

: 93-01-6
2-naphthol-6-sulfonic acid

Conditions

Conditions	Yield
With sulfuric acid at 90 - 100℃;

6-Hydroxynaphthalene-2-sulphonic acid Chemical Properties

6-Hydroxy-2-Naphalenesulfonic Acid (93-01-6) is also named as 6-Hydroxynaphthalene-2-sulphonic acid;2-Hydroxy-6-naphthalenesulfonic acid;2-hydroxy-6-naphthalenesulfonicacid;2-Hydroxynaphthalene-6-sulfonic acid;2-Naphtol-6-sulfosaure;6-hydroxy-2-naphthalenesulfonicaci;Baum's acid;beta-Naphthol-6-sulfonic acid;beta-naphthol-6-sulfonicacid,and so on.6-Hydroxy-2-Naphalenesulfonic Acid (93-01-6) is usually lamellae.

CAS: 93-01-6
Molecular Formula: C₁₀H₈O₄S
Molecular Weight: 224.23
Molecular structure:
EINECS: 205-218-1
Melting point: >300 °C(lit.)
Index of Refraction: 1.703
Molar Refractivity: 56.18 cm³
Molar Volume: 144.7 cm³
Polarizability: 22.27 10^-24cm³
Surface Tension: 71.1 dyne/cm
Density: 1.549 g/cm³

6-Hydroxynaphthalene-2-sulphonic acid Uses

6-Hydroxy-2-Naphalenesulfonic Acid (93-01-6) is commonly used for the manufacture of acidic dyes and food dyes.

6-Hydroxynaphthalene-2-sulphonic acid Toxicity Data With Reference

1.		orl-mus LDLo:250 mg/kg		ZHINAV Zeitschrift fuer Hygiene und Infektionskrankheiten. 64 (1909),113.
2.		scu-mus LDLo:650 mg/kg		ZHINAV Zeitschrift fuer Hygiene und Infektionskrankheiten. 64 (1909),113.

6-Hydroxynaphthalene-2-sulphonic acid Consensus Reports

Reported in EPA TSCA Inventory.

6-Hydroxynaphthalene-2-sulphonic acid Safety Profile

Poison by ingestion. Moderately toxic by subcutaneous route. When heated to decomposition it emits toxic fumes of SO_x.

Hazard Codes: Xi
Risk Statements: 36/37/38
Safety Statements: 26-36
WGK Germany: 3

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