P-Phenylenediamine

p-Phenylenediamine
Names
	Preferred IUPAC name Benzene-1,4-diamine
	Other names Paraphenylenediamine; 1,4-Diaminobenzene; 1,4-Phenylenediamine
Identifiers
CAS Number	106-50-3 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	749029
ChEBI	CHEBI:51403;
ChEMBL	ChEMBL403741;
ChemSpider	13835179 ;
DrugBank	DB14141;
ECHA InfoCard	100.003.096
EC Number	203-404-7;
KEGG	C19499 ;
PubChem CID	7814;
RTECS number	SS8050000;
UNII	U770QIT64J ;
UN number	1673
CompTox Dashboard (EPA)	DTXSID9021138 ;
	InChI InChI=1S/C6H8N2/c7-5-1-2-6(8)4-3-5/h1-4H,7-8H2 Key: CBCKQZAAMUWICA-UHFFFAOYSA-N ; InChI=1/C6H8N2/c7-5-1-2-6(8)4-3-5/h1-4H,7-8H2 Key: CBCKQZAAMUWICA-UHFFFAOYAD;
	SMILES Nc1ccc(N)cc1;
Properties
Chemical formula	C6H8N2
Molar mass	108.144 g·mol−1
Appearance	White crystalline solid, darkens upon exposure to air
Melting point	145 to 147 °C (293 to 297 °F; 418 to 420 K)
Boiling point	267 °C (513 °F; 540 K)
Solubility in water	10% at 40°C, 87% at 107 C, 100% at 140 C
Vapor pressure	<1 mmHg (20°C)
Acidity (pKa)	2.97 (doubly protonated form; 20 °C, H2O); 6.31 (conjugate acid; 20 °C, H2O);
Magnetic susceptibility (χ)	−70.28·10−6 cm3/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H311, H317, H319, H331, H410
Precautionary statements	P261, P264, P270, P271, P272, P273, P280, P301+P310, P302+P352, P304+P340, P305+P351+P338, P311, P312, P321, P322, P330, P333+P313, P337+P313, P361, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	3 0 0
Flash point	156 °C; 312 °F; 429 K
Autoignition; temperature	400 °C (752 °F; 673 K)
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	80 mg/kg (rat, oral); 98 mg/kg (rat, oral); 145 mg/kg (guinea pig, oral)
LDLo (lowest published)	250 mg/kg (rabbit, oral); 100 mg/kg (cat, oral)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 0.1 mg/m3 [skin]
REL (Recommended)	TWA 0.1 mg/m3 [skin]
IDLH (Immediate danger)	25 mg/m3
	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

p-Phenylenediamine (PPD) is an organic compound with the formula C₆H₄(NH₂)₂. This derivative of aniline is a white solid, but samples can darken due to air oxidation. It is mainly used as a component of engineering polymers and composites like kevlar. It is also an ingredient in hair dyes and is occasionally used as a substitute for henna.