O-Phenylenediamine

o-Phenylenediamine
Names
	Preferred IUPAC name Benzene-1,2-diamine
	Other names o-Phenylene diamine; 1,2-Diaminobenzene; 1,2-Phenylenediamine
Identifiers
CAS Number	95-54-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:34043 ;
ChEMBL	ChEMBL70582 ;
ChemSpider	13837582 ;
ECHA InfoCard	100.002.210
EC Number	202-430-6;
PubChem CID	7243;
RTECS number	SS7875000;
UNII	8B713N8Q0F ;
UN number	1673
CompTox Dashboard (EPA)	DTXSID3025881 ;
	InChI InChI=1S/C6H8N2/c7-5-3-1-2-4-6(5)8/h1-4H,7-8H2 Key: GEYOCULIXLDCMW-UHFFFAOYSA-N ; InChI=1/C6H8N2/c7-5-3-1-2-4-6(5)8/h1-4H,7-8H2 Key: GEYOCULIXLDCMW-UHFFFAOYAR;
	SMILES Nc1ccccc1N;
Properties
Chemical formula	C6H8N2
Molar mass	108.144 g·mol−1
Appearance	white solid
Density	1.031 g/cm3
Melting point	102 to 104 °C (216 to 219 °F; 375 to 377 K)
Boiling point	252 °C (486 °F; 525 K) Other sources: 256 to 258 °C (493 to 496 °F; 529 to 531 K)
Solubility in water	soluble in hot water
Acidity (pKa)	0.80 (doubly protonated form; 20 °C, H2O); 4.57 (conjugate acid; 20 °C, H2O);
Magnetic susceptibility (χ)	−71.98·10−6 cm3/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H312, H317, H319, H332, H341, H351, H410
Precautionary statements	P201, P202, P261, P264, P270, P271, P272, P273, P280, P281, P301+P310, P302+P352, P304+P312, P304+P340, P305+P351+P338, P308+P313, P312, P321, P322, P330, P333+P313, P337+P313, P363, P391, P405, P501
NFPA 704 (fire diamond)	3 1 0
Flash point	156 °C (313 °F; 429 K)
Safety data sheet (SDS)	Oxford MSDS
	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

o-Phenylenediamine (OPD) is an organic compound with the formula C₆H₄(NH₂)₂. This aromatic diamine is an important precursor to many heterocyclic compounds. OPD is a white compound although samples appear darker owing to oxidation by air. It is isomeric with m-phenylenediamine and p-phenylenediamine.