Hexachlorocyclopentadiene

Hexachlorocyclopentadiene

Names
IUPAC name 1,2,3,4,5,5-hexachlorocyclopenta-1,3-diene
Other names graphlox, perchlorocyclopentadiene
Identifiers
CAS Number	77-47-4 Y
3D model (JSmol)	Interactive image
ChemSpider	6233 Y
ECHA InfoCard	100.000.937
PubChem CID	6478
UNII	IP6ATU242I Y
CompTox Dashboard (EPA)	DTXSID2020688
InChI InChI=1S/C5Cl6/c6-1-2(7)4(9)5(10,11)3(1)8 Y Key: VUNCWTMEJYMOOR-UHFFFAOYSA-N Y InChI=1/C5Cl6/c6-1-2(7)4(9)5(10,11)3(1)8 Key: VUNCWTMEJYMOOR-UHFFFAOYAM
SMILES ClC1(Cl)C(/Cl)=C(/Cl)\C(\Cl)=C1\Cl
Properties
Chemical formula	C5Cl6
Molar mass	272.76 g·mol−1
Appearance	Pale-yellow to amber-colored liquid
Odor	Pungent, unpleasant[1]
Density	1.702 g/cm3
Melting point	−10 °C (14 °F; 263 K)
Boiling point	239 °C (462 °F; 512 K)
Solubility in water	0.0002% (Reacts, 25°C)[1]
Vapor pressure	0.08 mmHg
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Teratogen
Flash point	100 °C (212 °F; 373 K)
NIOSH (US health exposure limits):
PEL (Permissible)	none[1]
REL (Recommended)	TWA 0.01 ppm (0.1 mg/m3)[1]
IDLH (Immediate danger)	N.D.[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Hexachlorocyclopentadiene (HCCPD), also known as C-56, Graphlox, and HRS 1655, is an organochlorine compound with the formula C₅Cl₆. It is a precursor to pesticides, flame retardants, and dyes. It is a colourless liquid, although commercial samples appear lemon-yellow liquid sometimes with a bluish vapour. Many of its derivatives proved to be highly controversial, as studies showed them to be persistent organic pollutants. An estimated 270,000 tons were produced until 1976,^[2] and smaller amounts continue to be produced today.