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	88.53 g·mol−1
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 in diethyl ether	miscible
Solubility in acetone	miscible
Solubility in benzene	miscible
Solubility in ethanol	soluble
Vapor pressure	118 mmHg (10 °C (50 °F; 283 K)); 188 mmHg (20 °C (68 °F; 293 K)); 215 mmHg (25 °C (77 °F; 298 K));
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	P203, P210, P233, P240, P241, P242, P243, P260, P264, P264+P265, P270, P271, P280, P281, P301+P317, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P308+P313, P317, P318, P319, P321, P330, P332+P317, P337+P313, P362+P364, P370+P378, P403+P233, P403+P235, P405, P501 Preview warning: Omit Rules: keep P260, omit P261
NFPA 704 (fire diamond)	2 3 1
Flash point	−4 °C (25 °F; 269 K)
Explosive limits	1.9%–20.0%
Threshold limit value (TLV)	10 ppm (skin) (TWA)
	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)	25 ppm (90 mg/m3, TWA, skin)
REL (Recommended)	1 ppm (3.6 mg/m3, Ca C, [15-minute])
IDLH (Immediate danger)	300 ppm (1086 mg/m3)
Related compounds
Related Dienes	Butadiene; Isoprene;
Related compounds	2,3-Dichlorobutadiene; Vinyl chloride;
	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=CH₂. 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.