2-Chlorostyrene

Synonym(s):o -Chlorostyrene;o -Chlorovinylbenzene;1-Chloro-2-ethenylbenzene;1-Chloro-2-vinylbenzene

CAS NO.：2039-87-4
Empirical Formula: C8H7Cl
Molecular Weight: 138.59
MDL number: MFCD00000567
EINECS: 218-026-8
SAFETY DATA SHEET (SDS)
Update Date: 2025-09-25 17:15:13

What is 2-Chlorostyrene?

Chemical properties

2-Chlorostyrene, also called o-Chlorostyrene, is a flammable liquid that ranges in color from colorless to light yellow. It is used in the manufacture of polychlorostyrene which is a clear, colorless plastic with good foaming, heat distortion and flame-retardant properties.

The Uses of 2-Chlorostyrene

2-Chlorostyrene is an important raw material and intermediate used in organic Synthesis, pharmaceuticals, agrochemicals and dyestuff.

Preparation

o-Chlorostyrene is commercially produced as a monomer from o-chloroethylbenzene by an oxidation technique. p-Chlorostyrene is also produced as a mixture with o-chlorostyrene.

Air & Water Reactions

Highly flammable. Insoluble in water.

Reactivity Profile

2-Chlorostyrene may be sensitive to heat or prolonged exposure to light. 2-Chlorostyrene may polymerize.

Hazard

Central nervous system impairment and peripheral neuropathy.

Health Hazard

By analogy to styrene, ochlorostyrene is expected to cause central nervous system depression at extremely high concentrations and possibly irritation of the eyes, nose, and mucous membranes.
There are no reports of adverse effects in humans.

Fire Hazard

2-Chlorostyrene is combustible.

Safety Profile

A skin and eye irritant. When heated to decomposition it emits toxic fumes of Cl-. See also CHLORINATED HYDROCARBONS, AROMATIC .

Potential Exposure

In organic synthesis; in the preparation of specialty polymers.

Shipping

UN1993 Flammable liquids, n.o.s., Hazard Class: 3; Labels: 3-Flammable liquid, Technical Name Required.

Incompatibilities

Contact with elevated temperatures, strong oxidizers, strong bases; or acids may cause fire or explosion. May form peroxides; explosive polymerization may occur.

Properties of 2-Chlorostyrene

Melting point:	-63.1 °C
Boiling point:	58-60 °C/7 mmHg (lit.)
Density	1.08 g/mL at 25 °C (lit.)
refractive index	n20/D 1.565(lit.)
Flash point:	138 °F
storage temp.	2-8°C
form	Liquid
color	Colorless to Almost colorless
Water Solubility	Insoluble in water.
BRN	2038863
Exposure limits	ACGIH: TWA 50 ppm; STEL 75 ppm NIOSH: TWA 50 ppm(285 mg/m3); STEL 75 ppm(428 mg/m3)
CAS DataBase Reference	2039-87-4(CAS DataBase Reference)
NIST Chemistry Reference	2-Chlorostyrene(2039-87-4)
EPA Substance Registry System	o-Chlorostyrene (2039-87-4)

Safety information for 2-Chlorostyrene

Signal word	Danger
Pictogram(s)	Flame Flammables GHS02 Exclamation Mark Irritant GHS07 Health Hazard GHS08
GHS Hazard Statements	H226:Flammable liquids H227:Flammable liquids H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H332:Acute toxicity,inhalation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation H350:Carcinogenicity
Precautionary Statement Codes	P201:Obtain special instructions before use. P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233:Keep container tightly closed. P240:Ground/bond container and receiving equipment. P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. 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. P308+P313:IF exposed or concerned: Get medical advice/attention. P403+P235:Store in a well-ventilated place. Keep cool. P501:Dispose of contents/container to..…