C6H7N3O2
153.14 g/mol
Dye & PigmentWarning
4-Nitro-o-phenylenediamine
CAS99-56-9EC202-766-3
Category
Dye & Pigment
Compound Class
Aromatic
Primary Use
Hair dye intermediate
4-Nitro-o-phenylenediamine is a chemical compound primarily used as an intermediate in hair dye formulations. It produces brown, red, and blond shades in semi-permanent and permanent hair coloring products.
Intermediate in semi-permanent hair color formulationsIntermediate in permanent hair color formulationsColorimetric reagent for determination of ascorbic and dehydroascorbic acids in foods
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.
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Related Compounds
ApplicationSame Use
Toluene-2,5-diamine
CAS95-70-5
Hair dye intermediate
ReferenceSame Category
2-amino-4-nitrophenol
CAS99-57-0
Intermediate for mordant and acid dyes
ReferenceSame Category
2-methoxy-5-nitroaniline
CAS99-59-2
Intermediate for dyes and pigments
ReferenceSame Category
P-nitrotoluene
CAS99-99-0
Intermediate for azo and sulfur dyes
ReferenceSame Category
Acid Black 210
CAS99576-15-5
Azo dye for protein staining
Safety Reference
Warning
H302Harmful if swallowed
H317May cause an allergic skin reaction
Customs Tariff Classification
The international HS code for 4-Nitro-o-phenylenediamine (CAS 99-56-9) is 2921.51.
HS code (international, 6-digit)
2921.51
EU CN code (8-digit)
2921 51 19
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-nitrobenzene-1,2-diamine
InChIKey
RAUWPNXIALNKQM-UHFFFAOYSA-N
SMILES
C1=CC(=C(C=C1[N+](=O)[O-])N)N
Synonyms (28)
- 4-NO
- 4NDB
- 1,2-Benzenediamine, 4-nitro-
- 1,2-Diamino-4-nitrobenzene
- 2-Amino-4-nitroaniline
- 2-amino-4-nitrophenylamine
- 2-amino-5-nitroaniline
- 3,4-Diaminonitrobenzene
- 4-N-o-Pda
- 4-Nitro-1,2-benzenediamine
- 4-Nitro-1,2-diaminobenzene
- 4-Nitro-1,2-fenylendiamin
- 4-Nitro-1,2-phenylenediamine
- 4-Nitro-o-phenylenediamine
- 4-Nitro-para-phenylenediamine
- 4-Nitrophenylenediamine
- 4-Nop
- 4-Nopd
- 4-nitrobenzene-1
- 4-nitrobenzene-1,2-diamine
- Nitro-o-phenylenediamine
- O-PHENYLENEDIAMINE, 4-NITRO-
- aniline, 2-amino-4-nitro-
- p-Nitro-o-phenylenediamine
- p-nitro-o-phenylendiamine
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