Title: Diphenylamine
CAS Registry Number: 122-39-4
CAS Name: N-Phenylbenzeneamine
Molecular Formula: C12H11N
Molecular Weight: 169.22
Percent Composition: C 85.17%, H 6.55%, N 8.28%
Line Formula: C6H5NHC6H5
Literature References: Prepd by heating aniline with aniline hydrochloride.
Properties: Crystals; floral odor. d 1.16. mp 53-54°. bp 302°. Flash pt 153°C. Discolors in light. One gram dissolves in 2.2 ml alcohol, 4.5 ml propyl alcohol; freely sol in benzene, ether, glacial acetic acid, carbon disulfide. Insol in water. Forms salts with strong acids. Keep protected from light.
Melting point: mp 53-54°
Boiling point: bp 302°
Flash point: Flash pt 153°C
Density: d 1.16
Derivative Type: Hydrochloride
Molecular Formula: C12H11N.HCl
Molecular Weight: 205.68
Percent Composition: C 70.07%, H 5.88%, N 6.81%, Cl 17.24%
Properties: Crystals, turn blue in air. Freely sol in water, alcohol.
Derivative Type: Sulfate
Molecular Formula: C12H11N.H2SO4
Molecular Weight: 267.30
Percent Composition: C 53.92%, H 4.90%, N 5.24%, S 12.00%, O 23.94%
Properties: White to yellowish powder, mp 123-125°. Practically insol in water. Sol in alc, in H2SO4.
Melting point: mp 123-125°
CAUTION: Potential symptoms of overexposure to diphenylamine are irritation of eyes, skin, mucous membranes; eczema; tachycardia, hypertension; cough, sneezing; methemoglobinemia; increased blood pressure and heart rate; proteinuria, hematuria, bladder injury. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 120.
Use: Manuf dyes; stabilizing nitrocellulose explosives and celluloid. In anal. chem for the detection of NO3, ClO3 and other oxidizing substances with which, in the presence of H2SO4, it gives a deep-blue color.
Therap-Cat-Vet: Topically in antiscrewworm mixtures. In tests for nitrate or nitrite poisoning.
Diphenylcarbazone Diphenylketene Diphenylmagnesium Diphenylpyraline Diphetarsone

Skeletal formula
Ball-and-stick model
CAS number 122-39-4 YesY
ChemSpider 11003 YesY
KEGG C11016 YesY
RTECS number 9
Jmol-3D images Image 1
Molecular formula C12H11N
Molar mass 169.23 g/mol
Appearance White crystals
Density 1.2 g/cm³
Melting point 53 °C (326 K)
Boiling point 302 °C (575 K)
Solubility in water Slightly
MSDS External MSDS
R-phrases R23 R24 R25 R33 R50 R53
S-phrases S36 S37 S45 S60 S61
Main hazards Toxic. Possible mutagen. Possible teratogen. Harmful in contact with skin, and if swallowed or inhaled. Irritant.
NFPA 704
NFPA 704.svg
Flash point 152 °C; 306 °F; 425 K
Related compounds
Related Amine Aniline
Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Diphenylamine is an organic compound with the formula (C6H5)2NH. The compound is a derivative of aniline, consisting of an amine bound to two phenyl groups. The compound is a colourless solid, but commercial samples are often yellow due to oxidized impurities.[1]Diphenylamine dissolves well in many common organic solvents, but is insoluble in water.[2] It is used mainly for its antioxidant properties.