Description

o-Dianisidine is a vital aromatic amine and a key chemical intermediate in the synthesis of high-performance dyes and pigments. Its primary value lies in its role as a coupling agent for producing azo dyes, which are prized for their colorfastness and intensity. This compound is essential for manufacturers in the dye and pigment industry, as well as for research laboratories developing colorimetric detection reagents and analytical standards.

Application

• Azo Dye Synthesis: Primary intermediate for manufacturing direct blue and other azo dyes used in textiles, leather, and paper.
• Pigment Production: Key precursor for organic pigments applied in inks, paints, and plastics.
• Chemical Research: Used as a reagent and building block in organic synthesis and methodological development.
• Analytical Chemistry: Employed in the preparation of test kits and reagents for colorimetric detection methods.
• Laboratory Standard: Serves as a pure reference material for quality control and analytical calibration.

Basic Information

Product Name	o-Dianisidine
CAS No.	119-90-4
Molecular Formula	C14H16N2O2
Molecular Weight	244.29 g/mol
Synonyms	3,3'-Dimethoxybenzidine; Dianisidine; o-Dianisidine base; 3,3'-Dimethoxy-[1,1'-biphenyl]-4,4'-diamine; 4,4'-Diamino-3,3'-dimethoxybiphenyl; Direct Blue 15 intermediate; C.I. 37235; Fast Blue B Base
EINECS	204-355-4

Quality Control

Our o-Dianisidine is produced under a stringent quality management system to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including identification, assay, and impurity profiling. A detailed Certificate of Analysis (COA) documenting purity, physical characteristics, and test results is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from heat, sparks, and open flame. Due to its light-sensitive nature, containers should be kept in the original packaging or an opaque secondary container until use.

Specification

Item	Specification
Appearance	Off-white to grayish crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	137 - 142 °C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.