P-Phenylenediamine

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The main ingredient in hair dye. This organic compound turns brown when oxidizing agents

P-Phenylenediamine (Wikipedia)
p-Phenylenediamine
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Names
IUPAC name
1,4-Diaminobenzene
Other names
Paraphenylenediamine; 1,4-Diaminobenzene; 1,4-Phenylenediamine; Benzene-1.4-diamine
Identifiers
106-50-3 YesY
ChemSpider 13835179 N
Jmol 3D image Interactive graph
KEGG C19499 N
UNII U770QIT64J N
Properties
C6H8N2
Molar mass 108.14 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)
10% at 40°C, 87% at 107 C, 100% at 140 C
Vapor pressure <1 mmHg (20°C)
Hazards
R-phrases R23 R24 R25 R36 R37 R38 R40 R42 R43
S-phrases S26 S36 S37 S39
Flash point 156 °C; 312 °F; 429 K
Lethal dose or concentration (LD, LC):
80 mg/kg (rat, oral)
98 mg/kg (rat, oral)
145 mg/kg (guinea pig, oral)
250 mg/kg (rabbit, oral)
100 mg/kg (cat, oral)
US health exposure limits (NIOSH):
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).
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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. It is also an ingredient in hair dyes.

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