- Product Name:
- o-Dianisidine,3,3′-Dimethoxybenzidine, Fast BlueB
- 3.3'-Dimethoxybenzidine 1g [119-90-4]
- 4,4'-Diamino-3,3'-dimethoxybiphenyl 3,3'-Dimethoxybenzidine Fast Blue B
- 3,3'-Dimethoxybenzidine Solution, 100ppm
- [1,1'-Biphenyl]-4,4'-diamine, 3,3'-dimethoxy-
- Product Categories:
- Intermediates of Dyes and Pigments
- Biphenyl & Diphenyl ether
- Mol File:
o-Dianisidine Chemical Properties
- Melting point:
- 137-138 °C(lit.)
- Boiling point:
- 387.21°C (rough estimate)
- 1.1079 (rough estimate)
- refractive index
- 1.6000 (estimate)
- Flash point:
- 403 °F
- storage temp.
- Store at RT.
- H2O: slightly soluble
- Crystalline Powder
- Colour Index
- Pink to beige-brown
- Water Solubility
- Soluble in alcohol, benzene, ether, chloroform, acetone, most organic solvents and lipids. Slightly soluble in water.
- CAS DataBase Reference
- 119-90-4(CAS DataBase Reference)
- 2B (Vol. 4, Sup 7) 1987
- NIST Chemistry Reference
- Benzidine, 3,3'-dimethoxy-(119-90-4)
- EPA Substance Registry System
- 3,3'-Dimethoxybenzidine (119-90-4)
o-Dianisidine Usage And Synthesis
o-Dianisidine, crystallizes dimorphically, rarely in needles, with mp 133°C , often in flakes with mp 137-138°C . It forms colorless crystals, but commercial products have a tinge of violet. It is sparingly soluble in water but soluble in alcohol, ether, and benzene. One gram of ethyl acetate dissolves 0.285 g of o-dianisidine at 73°C .
The pure compound is stable upon exposure to air, but commercial products turn violet. o-Dianisidine is resistant to water but sensitive to oxidizing agents.
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.
o-Dianisidine is used almost exclusively as a chemical intermediate for producing dyes and pigments. In 1971, the Society of Dyers and Colourists reported its use in the production of 89 dyes (see Dyes Metabolized to o-Dianisidine, below). o-Dianisidine is also used as a chemical intermediate to produce o-dianisidine diisocyanate for use in adhesives and as a component of polyurethanes. Other uses are as a dye for paper, plastics, rubber, and textiles and as a test substance for detection of metals, thiocyanates, and nitrites (IARC 1974, HSDB 2009).
2-Nitroanisole is reduced (H2-catalyst or iron-formic acid) to o-anisidine or (benzidine-type reaction) to o-dianisidine [119-90-4], both of which are important as dye intermediates.
Journal of the American Chemical Society, 106, p. 7077, 1984 DOI: 10.1021/ja00335a035
Colorless crystals or a light brown powder. Turns violet on standing. Carcinogen.
Air & Water Reactions
Finely powdered material is a significant dust explosion hazard. Insoluble in water.
o-Dianisidine is a weak base. Reacts exothermically with acids. Sensitive to heat, air and prolonged exposure to light.
o-Dianisidine is combustible.
Confirmed carcinogen with experimental tumorigenic data. Moderately toxic by ingestion. Mutation data reported. Combustible when exposed to heat or flame. When heated to decomposition it emits toxic fumes of NOx.
o-Dianisidine is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals.
o-Dianisidine Preparation Products And Raw materials
- 010-82848833- ;010-82848833-
- 4,4'-BI(2-METHOXYBENZENE) DIAZONIUMSULFATE
- Tetranitroblue tetrazolium chloride
- TNBT DIFORMAZAN
- PIPERONYL TETRAZOLIUM BLUE
- TETRAZOLE BLUE DIFORMAZAN
- BENZOPURPURIN 10B
- 3-NITROTETRAZOLIUM BLUE CHLORIDE
- FAST BLUE B SALT FOR MICROSCOPY
- 4,4'-DIAMINODIPHENYL-3,3'-DIGLYCOLIC ACID
- 3,3'-(3,3'-DIMETHOXY-4,4'-DIPHENYLENE)BIS(2-PHENYL-5-VERATRYLTETRAZOLIUM CHLORIDE)
- Tetrazolium Blue Chloride
- VERATRYL TETRAZOLIUM BLUE