D

Diphenylamine

IUPAC: N-phenylaniline

C12H11N Organic Compounds CAS 122-39-4
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Quick Reference
Formula / NotationC12H11N
CAS Number122-39-4
Molecular Weight169.22
Melting Point129 to 131 °F (NTP, 1992)
Boiling Point576 °F at 760 mmHg (NTP, 1992)
Density1.068 at 141.8 °F (USCG, 1999) - Denser than water; will sink
Solubilityless than 1 mg/mL at 61 °F (NTP, 1992)
AppearanceDiphenylamine is a light tan to brown solid with a pleasant odor. Sinks in water. (USCG, 1999)
Also Known AsN-phenylaniline; N-Phenylaniline; 122-39-4; N,N-DIPHENYLAMINE; N-Phenylbenzenamine; Anilinobenzene; Phenylaniline; Scaldip; Big Dipper; N-Phenylbenzeneamine
CategoryOrganic Compounds

What is Diphenylamine?

Diphenylamine is an aromatic amine containing two phenyl substituents. It has been used as a fungicide for the treatment of superficial scald in apples and pears, but is no longer approved for this purpose within the European Union. It has a role as a ferroptosis inhibitor, an antioxidant, a radical scavenger, a carotogenesis inhibitor, an EC 1.3.99.29 [phytoene desaturase (zeta-carotene-forming)] inhibitor and an antifungal agrochemical. It is an aromatic amine, a secondary amino compound and a bridged diphenyl fungicide.

Formula & Notation

C12H11N

IUPAC Name: N-phenylaniline

Other Names / Synonyms: N-phenylaniline; N-Phenylaniline; 122-39-4; N,N-DIPHENYLAMINE; N-Phenylbenzenamine; Anilinobenzene; Phenylaniline; Scaldip; Big Dipper; N-Phenylbenzeneamine

Properties & Characteristics

Appearance: Diphenylamine is a light tan to brown solid with a pleasant odor. Sinks in water. (USCG, 1999). Molecular formula: C12H11N. Molecular weight: 169.22 g/mol. Boiling point: 576 °F at 760 mmHg (NTP, 1992). Melting point: 129 to 131 °F (NTP, 1992). Density: 1.068 at 141.8 °F (USCG, 1999) - Denser than water; will sink. Solubility: less than 1 mg/mL at 61 °F (NTP, 1992). Vapor pressure: 1 mmHg at 226.9 °F ; 60 mmHg at 404.4 °F (NTP, 1992). LogP: 3.5.

Physical Data

PropertyValue
Melting Point129 to 131 °F (NTP, 1992)
Boiling Point576 °F at 760 mmHg (NTP, 1992)
Density1.068 at 141.8 °F (USCG, 1999) - Denser than water; will sink
Molecular Weight169.22
Solubilityless than 1 mg/mL at 61 °F (NTP, 1992)
AppearanceDiphenylamine is a light tan to brown solid with a pleasant odor. Sinks in water. (USCG, 1999)

Uses & Applications

Used as an industrial feedstock, solvent, pharmaceutical intermediate, flavoring agent, or chemical building block.

Safety Information

Flammable or irritant. Many organic compounds are flammable liquids or vapours. Keep away from ignition sources. Consult SDS for specific hazard data.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Diphenylamine
Formula C12H11N
CAS Number 122-39-4
Molecular Weight 169.22
Synonyms N-phenylaniline; N-Phenylaniline; 122-39-4; N,N-DIPHENYLAMINE; N-Phenylbenzenamine; Anilinobenzene; Phenylaniline; Scaldip; Big Dipper; N-Phenylbenzeneamine

Frequently Asked Questions

Diphenylamine is an aromatic amine containing two phenyl substituents. It has been used as a fungicide for the treatment of superficial scald in apples and pears, but is no longer approved for this purpose within the European Union. It has a role as a ferroptosis inhibitor, an antioxidant, a radical scavenger, a carotogenesis inhibitor, an EC 1.3.99.29 [phytoene desaturase (zeta-carotene-forming)] inhibitor and an antifungal agrochemical. It is an aromatic amine, a secondary amino compound and a bridged diphenyl fungicide.

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.