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Chlorosulfonic acid

Name: Chlorosulfonic acid
Brand: SIAL

99%

Synonym(s):

Sulfuric chlorohydrin

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About This Item

Linear Formula:

ClSO₃H

CAS Number:

7790-94-5

Molecular Weight:

116.52

NACRES:

NA.21

PubChem Substance ID:

24880605

UNSPSC Code:

12352100

EC Number:

232-234-6

MDL number:

MFCD00011523

Assay:

99%

Concentration:

99%

Form:

liquid

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Properties

vapor density

4 (vs air)

Quality Segment

200

vapor pressure

1 mmHg ( 25 °C), 3.3 mmHg ( 37.7 °C)

assay

99%

form

liquid

expl. lim.

37.7 %

concentration

99%

refractive index

n20/D 1.433 (lit.)

pH

< 1 (at 20 °C)

bp

151-152 °C/755 mmHg (lit.)

solubility

acetic acid: soluble(lit.), chloroform: soluble(lit.), dichloromethane: soluble(lit.)

density

1.753 g/mL at 25 °C (lit.)

SMILES string

OS(Cl)(=O)=O

InChI

1S/ClHO3S/c1-5(2,3)4/h(H,2,3,4)

InChI key

XTHPWXDJESJLNJ-UHFFFAOYSA-N

Description

General description

Chlorosulfonic acid is a strong acid that is synthesized on an industrial scale by reacting sulfur trioxide and dry hydrogen chloride gas in an equimolar ratio. It can act as a sulfonating, dehydrating, oxidizing and chlorinating agent. It is reported to be a better electrophilic olefin cyclization agent in comparison to other sulfonic acids. Its infrared spectra in the solid, liquid and gaseous state have been recorded in the region 4000-400cm^-1.

Application

Chlorosulfonic acid may be used in the following processes:

Synthesis of di-n-butyl ammonium chlorosulfonate, a secondary amine ionic liquid.
To prepare sulfonated polyethersulfone (SPES) with enhanced hydrophilic property.
To attach sulfate group to silk fibroin for improving its anticoagulant ability.
As a catalyst to prepare substituted coumarin, via von Pechmann condensation between phenol and β-ketoester.
As a substitute to acid catalyst in Biginelli reaction to prepare 3,4dihydropyrimidines.

Packaging

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pictograms

GHS06,GHS05

signalword

Danger

hcodes

H314,H330,H335

pcodes

P260 - P271 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338

Hazard Classifications

Acute Tox. 1 Inhalation - Eye Dam. 1 - Skin Corr. 1A - STOT SE 3

target_organs

Respiratory system

supp_hazards

EUH014

Storage Class

6.1B - Non-combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter

Regulatory Information

危险化学品

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Chlorosulfonic acid catalyzed highly efficient solvent-free synthesis of 3,4-Dihydropyrimidin-2(1H)-one and thiones.

Kotharkar SA, et al.

Ukrainica Bioorganica Acta, 2, 17-21 (2006)

Chlorosulfonic acid-catalysed one-pot synthesis of coumarin.