C12H10Cl2N2
253.12 g/mol
Industrial ChemicalDanger
3,3'-DICHLOROBENZIDINE
CAS91-94-1EC202-109-0
Category
Industrial Chemical
Compound Class
Amine
Primary Use
Intermediate for azo dyes and pigments
3,3'-Dichlorobenzidine is a gray-to-purple or off-white crystalline solid that slowly converts from solid to gas. It is a manufactured compound used primarily as an intermediate in the production of azo dyes and pigments for applications such as printing inks, textiles, plastics, and paints.
Intermediate for azo dyesIntermediate for pigmentsCuring agent for urethane plastics
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:California Proposition 65
CAS 91-94-1
Related Compounds
StrongSame Parent
3,3'-dichlorobenzidine dihydrochloride
CAS612-83-9
Intermediate for azo dyes and pigments
ReferenceSame Category
Bitolylene diisocyanate
CAS91-97-4
polyurethane raw material
ReferenceSame Category
ZINC PALMITOSTEARATE
CAS91051-01-3
Processing aid for PVC
ReferenceSame Category
4-bromo-3'-chloro-1,1'-biphenyl
CAS91354-09-5
Building block for organic synthesis
ReferenceSame Category
3PGP2V
CAS915956-24-0
liquid crystal intermediate
Referencestereoisomer of
3,3'-dichlorobenzidine-d6
CAS93951-91-8
research compound
Safety Reference
Danger
H312Harmful in contact with skin
H317May cause an allergic skin reaction
H350May cause cancer
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects
H335May cause respiratory irritation
H341Suspected of causing genetic defects
H351Suspected of causing cancer
Customs Tariff Classification
The international HS code for 3,3'-DICHLOROBENZIDINE (CAS 91-94-1) is 2921.59.
HS code (international, 6-digit)
2921.59
EU CN code (8-digit)
2921 59 90
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
4-(4-amino-3-chlorophenyl)-2-chloroaniline
InChIKey
HUWXDEQWWKGHRV-UHFFFAOYSA-N
SMILES
C1=CC(=C(C=C1C2=CC(=C(C=C2)N)Cl)Cl)N
Synonyms (38)
- 3,3'-DICHLOROBENZIDINE
- 3,3'-Dichlorbenzidin
- 3,3'-Dichlorbenzidin [Czech]
- 3,3'-Dichloro-p,p'-bianiline
- 3,3'-Dichlorobenzidin
- 3,3'-Dichlorobenzidin [Czech]
- 3,3'-Dichlorobenzidina
- 3,3'-Dichlorobenzidine base
- 3,3-Dichlorobenzidine-13C12
- 3,4'-diamine
- 4,3'-dichlorobiphenyl
- 4,3'-dichlorodiphenyl
- Benzidine, 3,3'-dichloro-
- Benzidine,3'-dichloro-
- Curithane C126
- Dichlorobenzidine base
- Dichlorobenzidine, 3,3'-
- [1,4'-diamine, 3,3'-dichloro-
- o,o'-Dichlorobenzidine