5-Amino-1-naphthol

CAS NO.：83-55-6
Empirical Formula: C10H9NO
Molecular Weight: 159.18
MDL number: MFCD00041826
EINECS: 201-486-9
SAFETY DATA SHEET (SDS)
Update Date: 2023-04-23 13:52:06

What is 5-Amino-1-naphthol?

Chemical properties

pale purple to brown-purple crystalline powder

The Uses of 5-Amino-1-naphthol

5-Amino-1-naphthol is used as a coupling component for azo dyes (coupling takes place ortho to the amino or hydroxyl group, or para to the hydroxyl group depending on the pH), and as an intermediate for sulfur dyes.

Preparation

1-Aminonaphthalene-5-sulfonic acid paste (Section 6.2) is added to molten sodium hydroxide at 200°C, and the reaction is completed by heating slowly to 250°C and maintaining this temperature for 3 h. After dilution and careful neutralization with hydrochloric acid, 5-amino-1-naphthol precipitates in 85 % yield (mp 192°C).

Properties of 5-Amino-1-naphthol

Melting point:	190 °C (dec.) (lit.)
Boiling point:	284.68°C (rough estimate)
Density	1.1202 (rough estimate)
refractive index	1.6070 (estimate)
storage temp.	-20°C Freezer
solubility	DMSO (Slightly), Methanol (Slightly)
form	Solid
pka	3.97(at 25℃)
color	Light Purple to Purple
CAS DataBase Reference	83-55-6(CAS DataBase Reference)
NIST Chemistry Reference	5-Amino-1-naphthol(83-55-6)
EPA Substance Registry System	1-Naphthalenol, 5-amino- (83-55-6)

Safety information for 5-Amino-1-naphthol

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	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. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. 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.