3,4-Diaminotoluene

Synonym(s):3,4-Toluenediamine;4-Methyl-o-phenylenediamine

CAS NO.：496-72-0
Empirical Formula: C7H10N2
Molecular Weight: 122.17
MDL number: MFCD00007728
EINECS: 207-826-2
SAFETY DATA SHEET (SDS)
Update Date: 2026-05-28 05:23:27

What is 3,4-Diaminotoluene?

Chemical properties

Off-white small blocks

The Uses of 3,4-Diaminotoluene

5-Methylbenzotriazole intermediate.

The Uses of 3,4-Diaminotoluene

4-Methyl-o-phenylenediamine was employed as chromogenic reagent in the spectrophotometric determination of selenium(IV). It was used in the synthesis of an asymmetrical tetradentate Schiff base via condensation with dehydroacetic acid and salicylic aldehyde.

Synthesis Reference(s)

Tetrahedron Letters, 42, p. 2277, 2001 DOI: 10.1016/S0040-4039(01)00163-0

General Description

A colorless to brownish purple crystalline solid. Toxic by ingestion and inhalation and an irritant to skin and eyes. Soluble in water, alcohol and ether. Decomposes to emit toxic oxides of nitrogen when heated to high temperature. Used in making dyes.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

3,4-Diaminotoluene neutralizes acids in exothermic reactions to form salts plus water. May be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. Flammable gaseous hydrogen may be generated in combination with strong reducing agents, such as hydrides.

Fire Hazard

Flash point data for 3,4-Diaminotoluene are not available. 3,4-Diaminotoluene is probably combustible.

Properties of 3,4-Diaminotoluene

Melting point:	87-89 °C (lit.)
Boiling point:	155-156 °C/18 mmHg (lit.)
Density	1.2207 (rough estimate)
refractive index	1.5103 (estimate)
Flash point:	155-156°C/18mm
storage temp.	Keep in dark place,Inert atmosphere,Room temperature
solubility	Chloroform (Sparingly), Methanol (Slightly)
pka	4.59±0.10(Predicted)
form	Crystalline Chunks or Flakes
color	Brown to grayish-brown
Water Solubility	16 g/L (20 ºC)
BRN	507965
Stability:	Stable. Incompatible with strong oxidizing agents.
CAS DataBase Reference	496-72-0(CAS DataBase Reference)
NIST Chemistry Reference	1,2-Benzenediamine, 4-methyl-(496-72-0)
EPA Substance Registry System	3,4-Diaminotoluene (496-72-0)

Safety information for 3,4-Diaminotoluene

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.