2,4-DINITROBENZENESULFONIC ACID Chemical Properties

Melting point:

95-98 °C(lit.)

Density 

1.745 (estimate)

refractive index 

1.6430 (estimate)

form 

solid

pka

-2.21±0.50(Predicted)

Water Solubility 

Soluble in methanol (2.5% w/v), slightly soluble in water.

CAS DataBase Reference

89-02-1(CAS DataBase Reference)

EPA Substance Registry System

Benzenesulfonic acid, 2,4-dinitro- (89-02-1)

Safety Information

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

26-36/37/39-45

RIDADR 

UN 1759 8/PG 2

WGK Germany 

3

RTECS 

DB6500000

TSCA 

Yes

HazardClass 

8

PackingGroup 

III

MSDS

• Language:English Provider:SigmaAldrich

2,4-DINITROBENZENESULFONIC ACID Usage And Synthesis

Chemical Properties

YELLOW TO YELLOW-BROWN CRYSTALLINE POWDER

Uses

Reduction of 2,4-Dinitrobenzenesulfonic Acid gives the colorant intermediate 1,3-diaminobenzene-4-sulfonic acid [88-63-1] as an alternative to the sulfonation of m-phenylenediamine.

Production Methods

2,4-Dinitrochlorobenzene is warmed with aqueous sodium sulfite to give an 80 % yield of the sodium salt of 2,4-Dinitrobenzenesulfonic Acid [885-62-1] as yellow needles after salting out. The lower reactivity of 2- and 4- chloronitrobenzene requires much higher temperature for this nucleophilic sulfitation, with too many side reactions to be practicable.

Definition

ChEBI: The arenesulfonic acid that is benzenesulfonic acid with two nitro substituents in the 2- and 4-positions.

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