Dibenzo-1,4-dioxin

{{see also|1,4-Dioxin|Dioxins and dioxin-like compounds|Polychlorinated dibenzodioxins}}

{{chembox

| Watchedfields = changed

| verifiedrevid = 396327766

| Name = Dibenzo-p-dioxin

| ImageFile = Dibenzo-p-dioxin.svg

| ImageSize =180px

| ImageName = Dibenzodioxin

| ImageFile1 = Dibenzo-1,4-dioxin-3D-balls.png

| ImageSize1 = 160

| ImageAlt1 = Ball-and-stick model

| ImageFile2 = Dibenzo-1,4-dioxin-3D-spacefill.png

| ImageSize2 = 140

| ImageAlt2 = Space-filling model

| PIN = Oxanthrene{{cite book |author=International Union of Pure and Applied Chemistry |date=2014 |title=Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013 |publisher=The Royal Society of Chemistry |pages=216 |doi=10.1039/9781849733069-00130 |isbn=978-0-85404-182-4}}

| OtherNames = Dibenzodioxin,
Dibenzo-p-dioxin,
Dibenzo-1,4-dioxin

|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 8861

| InChI = 1/C12H8O2/c1-2-6-10-9(5-1)13-11-7-3-4-8-12(11)14-10/h1-8H

| SMILES = O1c3c(Oc2c1cccc2)cccc3

| InChIKey = NFBOHOGPQUYFRF-UHFFFAOYAJ

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/C12H8O2/c1-2-6-10-9(5-1)13-11-7-3-4-8-12(11)14-10/h1-8H

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = NFBOHOGPQUYFRF-UHFFFAOYSA-N

| CASNo_Ref = {{cascite|correct|CAS}}

| CASNo = 262-12-4

| KEGG_Ref = {{keggcite|correct|kegg}}

| KEGG = C07732

| PubChem = 9216

| EC_number = 205-974-2

| UNNumber = 3077

| UNII = O1B5KJ235I

| ChEBI = 28891

| ChEMBL = 3184198

| Beilstein = 143227

| Gmelin = 280302

}}

|Section2={{Chembox Properties

| C=12 | H=8 | O=2

| Appearance = White crystals

| Density = 1.243 kg/m³

| Solubility = 0.901 g/L (25 °C)

| MeltingPtC = 122

| BoilingPtC = 283.5

| Viscosity =

| Dipole =

}}

|Section7={{Chembox Hazards

| FlashPt =

| NFPA-F =

| NFPA-R =

| GHSPictograms = {{GHS07}}{{GHS09}}

| GHSSignalWord = Warning

| HPhrases = {{H-phrases|H302|411}}

| PPhrases = {{P-phrases|P264|270|273|301+312|330|391|501}}

| LD50 = 866 mg/kg (mouse, oral){{cite web |title=DIBENZO-P-DIOXIN - Safety Data Sheet |url=https://www.chemicalbook.com/msds/DIBENZO-P-DIOXIN.htm |website=www.chemicalbook.com}}

}}

|Section8={{Chembox Related

| OtherCompounds = polychlorinated dibenzodioxins ("dioxin"),
dioxins and dioxin-like compounds}}

}}

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.

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.