Chloroprene

Chloroprene
Names
	Preferred IUPAC name 2-Chlorobuta-1,3-diene
	Other names Chloroprene, 2-chloro-1,3-butadiene, Chlorobutadiene, β-Chloroprene
Identifiers
CAS Number	126-99-8 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	741875
ChEBI	CHEBI:39481 ;
ChEMBL	ChEMBL555660 ;
ChemSpider	29102 ;
ECHA InfoCard	100.004.381
EC Number	204-818-0;
Gmelin Reference	277888
KEGG	C19208 ;
PubChem CID	31369;
RTECS number	EL9625000;
UNII	42L93DWV3A ;
UN number	1991
CompTox Dashboard (EPA)	DTXSID5020316 ;
	InChI InChI=1S/C4H5Cl/c1-3-4(2)5/h3H,1-2H2 Key: YACLQRRMGMJLJV-UHFFFAOYSA-N ; InChI=1/C4H5Cl/c1-3-4(2)5/h3H,1-2H2 Key: YACLQRRMGMJLJV-UHFFFAOYAQ;
	SMILES C=C(Cl)C=C;
Properties
Chemical formula	C4H5Cl
Molar mass	88.5365 g/mol
Appearance	Colorless liquid
Odor	Pungent, ether-like
Density	0.9598 g/cm3
Melting point	−130 °C (−202 °F; 143 K)
Boiling point	59.4 °C (138.9 °F; 332.5 K)
Solubility in water	0.026 g/100 mL
Solubility	Soluble in alcohol, diethyl ether ; Miscible in ethyl ether, acetone, benzene
Vapor pressure	188 mmHg (20 °C)
Refractive index (nD)	1.4583
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Highly flammable, irritant, toxic
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H302, H315, H319, H332, H335, H350, H373
Precautionary statements	P201, P202, P210, P233, P240, P241, P242, P243, P260, P261, P264, P270, P271, P280, P281, P301+P312, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P308+P313, P312, P314, P321, P330, P332+P313, P337+P313, P362, P370+P378, P403+P233, P403+P235, P405, P501
NFPA 704 (fire diamond)	2 3 0
Flash point	−15.6 °C (3.9 °F; 257.5 K)
Explosive limits	1.9–11.3%
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	450 mg/kg (rat, oral)
LC50 (median concentration)	3207 ppm (rat, 4 hr)
LCLo (lowest published)	1052 ppm (rabbit, 8 hr) ; 350 ppm (cat, 8 hr)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 25 ppm (90 mg/m3) [skin]
REL (Recommended)	Ca C 1 ppm (3.6 mg/m3) [15-minute]
IDLH (Immediate danger)	300 ppm
Related compounds
Related Dienes	Butadiene ; Isoprene
Related compounds	Vinyl chloride ; 2,3-Dichlorobutadiene
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Chloroprene (IUPAC name 2-chlorobuta-1,3-diene) is a chemical compound with the molecular formula CH₂=CCl−CH=CH_2. Chloroprene is a colorless volatile liquid, almost exclusively used as a monomer for the production of the polymer polychloroprene, better known as neoprene, a type of synthetic rubber.