NAPHTHOL AS-E

PRODUCT IDENTIFICATION
CAS NO. 92-78-4

NAPHTHOL AS-E

EINECS NO.  
FORMULA C17H12ClNO2
MOL WT. 297.74
H.S. CODE  
SMILES

 

CLASSIFICATION

NAPHTHOLS /

TOXICITY  
SYNONYMS C.I. 37510; 4'-Chloro-3-hydroxy-2-naphthanilide;
C.I. Azoic Coupling Component No. 10; 2-Hydroxy-3-Naphthoyl-P-Chloraniline;

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE

off-white powder

MELTING POINT 255 C
BOILING POINT  
SPECIFIC GRAVITY  
SOLUBILITY IN WATER  
AUTOIGNITION  
pH  
VAPOR DENSITY  
NFPA RATINGS  

REFRACTIVE INDEX

  
FLASH POINT

 

STABILITY Stable under ordinary conditions.

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

APPEARANCE

off-white powder

PURITY

98.5% min

MELTING POINT

255 C

INSOLUBLES

0.3% max

TRANSPORTATION
PACKING 25kgs in bag
HAZARD CLASS  
UN NO.

 

OTHER INFORMATION
Hazard Symbols: XI, Risk Phrases: 36/37/38, Safety Phrases: 24/25