1-[(2,5-dimethoxyphenyl)azo]-2-naphthol Chemical Properties

Melting point:

155-157°

Boiling point:

448.73°C (rough estimate)

Density 

1.2510 (rough estimate)

refractive index 

1.5700 (estimate)

pka

13.61±0.50(Predicted)

Colour Index 

12156

BRN 

4510811

LogP

3.129 (est)

IARC

2B (Vol. 8, Sup 7) 1987

EPA Substance Registry System

Citrus Red No. 2 (6358-53-8)

Safety Information

Hazard Codes 

Xn

Risk Statements 

40

Safety Statements 

45

WGK Germany 

3

RTECS 

QL3675000

Hazardous Substances Data

6358-53-8(Hazardous Substances Data)

Toxicity

citrus red is a color used for coloring the skin of mature oranges. This compound has been described as being carcinogenic.

1-[(2,5-dimethoxyphenyl)azo]-2-naphthol Usage And Synthesis

Uses

To color orange skins.

Preparation

2,5-Dimethoxyaniline diazotization, and Naphthalen-2-ol coupling.

Definition

ChEBI: Citrus Red No.2 is a member of azobenzenes.

General Description

Orange to yellow solid or dark red powder.

Air & Water Reactions

Azo dyes can be explosive when suspended in air at specific concentrations. Insoluble in water.

Reactivity Profile

1-[(2,5-dimethoxyphenyl)azo]-2-naphthol is an azo compound. Toxic gases are formed by mixing compounds containing azo groups with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides.

Hazard

Possible carcinogen.

Health Hazard

ACUTE/CHRONIC HAZARDS: When heated to decomposition it emits toxic fumes of NOx.

Fire Hazard

Flash point data for 1-[(2,5-dimethoxyphenyl)azo]-2-naphthol are not available. 1-[(2,5-dimethoxyphenyl)azo]-2-naphthol is probably combustible.

Safety Profile

Confirmed carcinogen with experimental carcinogenic data. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx

Properties and Applications

orange to red. Melting point of 155 ~ 157 ℃. Slightly soluble in water, slightly soluble in ethanol and rape oil.

1-[(2,5-dimethoxyphenyl)azo]-2-naphthol(6358-53-8)Related Product Information

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