2-CHLORO-5-NITROBENZENESULFONIC ACID

CAS NO.：96-73-1
Empirical Formula: C6H4ClNO5S
Molecular Weight: 237.62
MDL number: MFCD00065336
EINECS: 202-528-9
SAFETY DATA SHEET (SDS)
Update Date: 2026-05-28 02:54:34

What is 2-CHLORO-5-NITROBENZENESULFONIC ACID?

Chemical properties

Tan Solid

Physical properties

2-Chloro-5-nitrobenzenesulfonic Acid, crystallizes as the dihydrate from water (mp 169 ℃, decomp.). The compound undergoes explosive decomposition when heated above 200 ℃, and all reactions, including its production, must be undertaken with great caution.

The Uses of 2-CHLORO-5-NITROBENZENESULFONIC ACID

Amination of 2-Chloro-5-nitrobenzenesulfonic Acid gives 4-nitroaniline- 2-sulfonic acid [96-75-3], which is used as a diazo component or reduced to the important colorant intermediate 2,5-diaminobenzenesulfonic acid [88-45-9]. Chlorination of 2-Chloro-5-nitrobenzenesulfonic Acid in aqueous solution is a more facile route to 2,6- dichloro-4-nitroaniline than chlorination of 4-nitroaniline.

Production Methods

4-Chloronitrobenzene is sulfonated with 65 % oleum at 115 ℃; special precaution must be taken to control temperature. Work-up is by quenching and isolation of the sodium salt after it has been salted out.

Properties of 2-CHLORO-5-NITROBENZENESULFONIC ACID

Melting point:	>300°C
Density	1.651 (estimate)
refractive index	1.6000 (estimate)
storage temp.	Refrigerator
form	solid
pka	-1.73±0.33(Predicted)
CAS DataBase Reference	96-73-1(CAS DataBase Reference)
EPA Substance Registry System	Benzenesulfonic acid, 2-chloro-5-nitro- (96-73-1)

Safety information for 2-CHLORO-5-NITROBENZENESULFONIC ACID

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H317:Sensitisation, Skin H319:Serious eye damage/eye irritation
Precautionary Statement Codes	P280:Wear protective gloves/protective clothing/eye protection/face protection. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.