Home Categories Organic Chemistry 3,3'-Dimethoxybenzidine
A3135712

3,3'-Dimethoxybenzidine , 97% , 119-90-4

Synonym(s):
3,3′-Dimethoxybenzidine;Fast Blue B

CAS NO.:119-90-4

Empirical Formula: C14H16N2O2

Molecular Weight: 244.29

MDL number: MFCD00008372

EINECS: 204-355-4

Update time: 2022-07-08

PRODUCT Properties

Melting point: 137-138 °C(lit.)
Boiling point: 387.21°C (rough estimate)
Density  1.1079 (rough estimate)
refractive index  1.6000 (estimate)
Flash point: 403 °F
storage temp.  Store at RT.
solubility  H2O: slightly soluble
form  Crystalline Powder
Colour Index  37235
pka 4.71±0.10(Predicted)
color  Pink to beige-brown
Water Solubility  Soluble in alcohol, benzene, ether, chloroform, acetone, most organic solvents and lipids. Slightly soluble in water.
Merck  14,2991
BRN  1879884

Description and Uses

DMOB is a colorless crystalline materialwhich may turn purple on standing in air. Molecularweight=244.32; Freezing/Melting point=137-138℃;Flash point=206℃. Hazard Identification (based onNFPA-704 M Rating System): Health 2, Flammability 1,Reactivity 0. Slightly soluble in water.

o-Dianisidine is a starting material for the production of disazo dyes and pigments.
Like benzidine and o-tolidine, o-dianisidine forms colors with numerous oxidizing agents, e.g., copper, cobalt, and gold ions. o-Dianisidine is quantitatively determined by titration with nitrite using potassium iodide and starch paper as the indicator. o-Dianisidine can be detected in the urine using potassium 1,2-naphthoquinone4-sulfonate after extraction. A rapid and easy method is based on the color formed with cyanogen bromide. Its detection limit is 0.05 mg/kg.
The free o-dianisidine base and the dihydrochloride are marketed in moist forms with a 10-30% water content.

Safety

Symbol(GHS) 
GHS07,GHS08
Signal word  Danger
Hazard statements  H302-H350
Precautionary statements  P201-P301+P312+P330-P308+P313
Hazard Codes  T
Risk Statements  45-22
Safety Statements  53-45
RIDADR  2811
WGK Germany  3
RTECS  DD0875000
TSCA  Yes
HazardClass  6.1(a)
PackingGroup  II
HS Code  29222990
Toxicity Dianisidine is a probable carcinogen used in the manufacture of dyes. EPA has classified as a Group 2B—probable human carcinogen.

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