4-Chloro-3-nitrobenzenesulfonic acid is an industrial chemical primarily used as an intermediate in the production of dyes. It features an aromatic ring substituted with chloro, nitro, and sulfonic acid groups, contributing to its reactivity in azo dye synthesis.
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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4,4'-thiodianiline
Dye intermediate
Trimethyl borate
Flame retardant and welding flux
Triethylamine
Chemical intermediate and catalyst
Trimethyl phosphite
Intermediate in pesticide manufacture
Sulfanilic acid
Intermediate for dyes and organic chemicals
Sodium 4-chloro-3-nitrobenzenesulfonate
chemical intermediate for dyes and pigments
The international HS code for 4-Chloro-3-nitrobenzenesulfonic acid (CAS 121-18-6) is 2904.99.
2904.99
2904 99 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
4-chloro-3-nitrobenzenesulfonic acid
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C1=CC(=C(C=C1S(=O)(=O)O)[N+](=O)[O-])Cl
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