Dibenzo-1,4-dioxin, also dibenzodioxin or dibenzo-p-dioxin (dibenzo-para-dioxin), is a polycyclic heterocyclic organic compound in which two benzene rings are connected by a 1,4-dioxin ring. Its molecular formula is C₁₂H₈O₂. The two oxygen atoms occupy opposite (para-) positions in the six-membered dioxin ring.

Dibenzo-p-dioxin

Names
Preferred IUPAC name Oxanthrene[1]
Other names Dibenzodioxin, Dibenzo-p-dioxin, Dibenzo-1,4-dioxin
Identifiers
CAS Number	262-12-4 Y
3D model (JSmol)	Interactive image
Beilstein Reference	143227
ChEBI	CHEBI:28891
ChEMBL	ChEMBL3184198
ChemSpider	8861 Y
ECHA InfoCard	100.005.432
EC Number	205-974-2
Gmelin Reference	280302
KEGG	C07732 Y
PubChem CID	9216
UNII	O1B5KJ235I
UN number	3077
CompTox Dashboard (EPA)	DTXSID8020410
InChI InChI=1S/C12H8O2/c1-2-6-10-9(5-1)13-11-7-3-4-8-12(11)14-10/h1-8H Y Key: NFBOHOGPQUYFRF-UHFFFAOYSA-N Y InChI=1/C12H8O2/c1-2-6-10-9(5-1)13-11-7-3-4-8-12(11)14-10/h1-8H Key: NFBOHOGPQUYFRF-UHFFFAOYAJ
SMILES O1c3c(Oc2c1cccc2)cccc3
Properties
Chemical formula	C12H8O2
Molar mass	184.194 g·mol−1
Appearance	White crystals
Melting point	122 °C (252 °F; 395 K)
Boiling point	283.5 °C (542.3 °F; 556.6 K)
Solubility in water	0.901 g/L (25 °C)
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H411
Precautionary statements	P264, P270, P273, P301+P312, P330, P391, P501
Related compounds
Related compounds	polychlorinated dibenzodioxins ("dioxin"), dioxins and dioxin-like compounds
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

Dibenzodioxin is the carbon skeleton of the poisonous polychlorinated dibenzodioxins (PCDDs), often called dioxins. The most harmful PCDD is 2,3,7,8-tetrachlorodibenzodioxin (TCDD). Dioxins and dioxin-like compounds is a category of pollutants that includes PCDDs and other compounds that have similar structure, toxicity, and persistence. Dibenzodioxin is also the skeleton of the polybrominated dibenzodioxins.