4,4'-DIAMINO-3,3'-DIMETHYLDIPHENYLMETHANE Chemical Properties

Melting point:

155-157 °C

Boiling point:

357.94°C (rough estimate)

Density 

0.9543 (rough estimate)

vapor pressure 

1.8hPa at 205.5℃

refractive index 

1.5000 (estimate)

storage temp. 

Keep in dark place,Inert atmosphere,Room temperature

Water Solubility 

Insoluble in water

solubility 

Chloroform (Slightly), Methanol (Slightly)

pka

5.18±0.25(Predicted)

color 

White to Light yellow to Light orange

BRN 

398069

InChIKey

WECDUOXQLAIPQW-UHFFFAOYSA-N

CAS DataBase Reference

838-88-0(CAS DataBase Reference)

IARC

2B (Vol. 4, Sup 7) 1987

EPA Substance Registry System

4,4'-Methylenebis(2-methylaniline) (838-88-0)

Safety Information

Hazard Codes 

T,N

Risk Statements 

45-22-43-50/53

Safety Statements 

53-45-60-61

RIDADR 

UN 3077 9/PG 3

WGK Germany 

3

RTECS 

BY5300000

F 

10-23

HazardClass 

6.1(b)

PackingGroup 

III

HS Code 

29215900

MSDS

• Language:English Provider:SigmaAldrich

4,4'-DIAMINO-3,3'-DIMETHYLDIPHENYLMETHANE Usage And Synthesis

Chemical Properties

White powder. Soluble in ethanol and hot water.

Uses

4,4′-Methylene-bis(2-methylaniline) has been used as a reference standard for the determination of 4,4′-methylene-bis(2-methylaniline) in plastic multilayer food packaging materials by liquid chromatography (LC)-Orbitrap-full scan-high resolution mass spectrometry (HRMS).
It may be used as a reference standard for the analysis of 4,4′-methylene-bis(2-methylaniline) in dyes, cosmetics, finger paints and inks for pens and tattoos by LC-MS.

Uses

4,4'-Diamino-3,3'-dimethyldiphenylmethane can be used for preparation polyimide and epoxy resin material.

Definition

ChEBI: 4,4'-Methylene bis(2-methylaniline) is a diarylmethane.

General Description

4,4′-Methylene-bis(2-methylaniline) belongs to the primary aromatic amines (PAAs) family of compounds which are toxic in nature and are probable human carcinogens.

Safety Profile

Confirmed carcinogen with experimental carcinogenic data. Moderately toxic by ingestion. An eye irritant. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx.

Synthesis

(1) o-toluidine, water and 37% hydrochloric acid were added into the reactor in the ratio of o-toluidine to hydrochloric acid at the molar ratio of 1:1.2 and the weight ratio of o-toluidine to water at the ratio of 1:4, and the reaction was stirred for 30 minutes; (2) the 37% formaldehyde solution was diluted to 10%; (3) the reaction solution from step (1) and the diluted formaldehyde solution from step (2) were transported via advective pumps to each of the microreactor's two inlets, controlling the molar ratio of o-toluidine to formaldehyde to be 3:1; (4) in the microreactor, the two raw materials were contacted, mixed and reacted, the reaction temperature was controlled at 40 °C, the liquid-time air velocity was 3000 h-1, and the reacted solution flowed out from the reactor outlet; (5) the reaction solution was cooled down to room temperature, and the aqueous sodium hydroxide was added dropwise to adjust pH to about 9, and a large amount of white precipitate precipitated, which was filtered, drying to obtain 3,3'-dimethyl-4,4'-diaminodiphenylmethane (MDT) crude product; (6) the crude MDT was recrystallized by ethanol, filtered and dried to obtain the pure MDT with a molar yield of 86% and a purity of 99%.

References

[1] Patent: CN106986777, 2017, A. Location in patent: Paragraph 0043-0055; 0057; 0059; 0061; 0063; 0065
[2] Catalysis Communications, 2014, vol. 45, p. 69 - 73
[3] Journal of the American Chemical Society, 1935, vol. 57, p. 887,889
[4] Journal of the American Chemical Society, 1934, vol. 57, p. 1944
[5] Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1982, vol. 21, # 8, p. 721 - 723

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