NAPHTHOL

PRODUCT IDENTIFICATION

ALPHA-NAPHTHOL

CAS NO. 90-15-3

ALPHA-NAPHTHOL

ELINCS/EINECS NO. 201-969-4
FORMULA C10H7OH
MOL WT. 144.17
H.S. CODE 2907.15
TOXICITY Oral rat LD50: 1870 mg/kg
SYNONYMS 1-Naphthol; 1-Naphthalenol; C.I. 76605;
1-Hydroxynaphthalene; Durafur developer D; Fouramine ern; Fourrine 99; Fourrine ern; Furro ER; Nako TRB; Oxidation base 33;
SMILES

1-Naphthalenesulfonic acid with Caustic Alkali

CLASSIFICATION

 

BETA-NAPHTHOL

CAS NO. 135-19-3

BETA-NAPHTHOL

ELINCS/EINECS NO. 205-182-7
FORMULA C10H7OH
MOL WT. 144.17
H.S. CODE 2907.15
TOXICITY Oral rat LD50: 1960 mg/Kg
SYNONYMS 2-Naphthol; 2-Hydroxynaphthalene; 2-Naphthalenol;
Isonaphthol; Beta-hydroxynaphthalene; Hydroxynaphthalene; Naphthalenol; Naphthyl alcohol; Naphthyl hydroxide;
SMILES

2-Naphthalenesulfonic acid with Caustic soda

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES

ALPHA-NAPHTHOL

PHYSICAL STATE White to tan crystalline powder
MELTING POINT

95 - 96 C

BOILING POINT

278 - 280 C

SPECIFIC GRAVITY

1.20

SOLUBILITY IN WATER Very slightly soluble

SOLVENT SOLUBILITY

 

AUTOIGNITION

450 C

pH

 

VAPOR DENSITY

4.5

NFPA RATINGS Health: 2 Flammability: 1 Reactivity: 0  Contact Rating: 3 (Corrosive)
REFRACTIVE INDEX

 

FLASH POINT

125 C

STABILITY Stable under ordinary conditions

BETA-NAPHTHOL

PHYSICAL STATE White to yellow crystalline powder
MELTING POINT 121 - 122 C
BOILING POINT 285 - 286 C
SPECIFIC GRAVITY 1.22
SOLUBILITY IN WATER Slightly soluble

SOLVENT SOLUBILITY

 
AUTOIGNITION

550 C

pH  
VAPOR DENSITY 4.97
NFPA RATINGS Health: 1 Flammability: 1 Reactivity: 0  
REFRACTIVE INDEX  
FLASH POINT

153 C

STABILITY Stable under ordinary conditions (Discolors may occur on exposure to light.)

GENERAL DESCRIPTION AND APPLICATIONS

Naphthols are either of two crystalline monohydric alcohols, derived from naphthalene and belong to the phenol family. There are position isomers; alpha-naphthol (also called 1-naphthol) is 1-hydroxynaphthalene and beta-naphthol (also called 2-naphthol) is 2-hydroxynaphthalene. The compound 1-naphthol is made by heating 1-naphthalenesulfonic acid with caustic alkali or by heating 1-naphthylamine with water under pressure. The compound 2-naphthol is manufactured by fusing 2-naphthalenesulfonic acid with caustic soda. The different positions provide various chemical structures which offer important roles to each characteristic colours. Naphthols are slightly soluble in water but readily soluble in short alcohols, ethers chlorinated solvents, and caustic alkalis. They are used directly in making several dyes and are converted into numerous corresponding amines, esters, ethers and carboxylic derivatives as well as into numerous sulfo- and nitro-group substituted (mono-, di- and tri) naphthol compounds. They find extensive applications in making dyes, pigments, fluorescent whiteners, tanning agents, antioxidants, and antiseptics. Naphthol structure is found as a ligand in transition-metal catalysts particularly in the form of  binaphthol (binol) which is composed of two naphthol rings connected at one carbon site on each ring. Optically active binol is widely used in asymmetric synthesis of rearrangements, epoxidations, reductions.
SALES SPECIFICATION

ALPHA-NAPHTHOL

APPEARANCE

White to yellowish flakes or crystalline powder
CONTENT

99.0% min

ISOMER IMPURITY

0.2% max

MELTING POINT

93 C min

MOISTURE

0.1% max

BETA-NAPHTHOL

APPEARANCE

White to yellowish flakes or crystalline powder
CONTENT

99.0% min

ISOMER IMPURITY

0.2% max

MELTING POINT

120 C min

TRANSPORTATION

ALPHA-NAPHTHOL

PACKING 25kgs in bag
HAZARD CLASS 8
UN NO.

1759

BETA-NAPHTHOL

PACKING 25kgs in bag
HAZARD CLASS  
UN NO.  
REMARKS
Hazard Symbols: XN, Risk Phrases: 21/22/37/38/41, Safety Phrases:22/26/37/39 (ALPHA-NAPH
Hazard Symbols: XN, Risk Phrases: 20/22, Safety Phrases:24/25 (BETA-NAPHTHOL)