4-Nitrotoluene-2-sulfonic acid
4-Nitrotoluene-2-sulfonic acid contains a nitro group para to the methyl and sulfonic acid ortho to methyl on the toluene ring, qualifying as a nitrotoluenesulfonic acid under HTS 2904.99.20.00. This sulfonated, nitrated hydrocarbon derivative aligns with Chapter 29 definitions for separate chemically defined compounds. Commonly serves as precursor in azo dye manufacturing.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If contains organo-sulfur beyond simple sulfonic acid
Additional sulfur directly linked to carbon excludes from 2904 per heading 2930 note.
If for other nitrated aromatic sulfonic acids without toluene base
Toluene-specific provision separates from general nitrosulfonic acids in same group.
If salt form used as fertilizer additive
Inorganic/organic salts may shift to Chapter 31 per note 5(C)(1) for end-use.
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Import Tips & Compliance
• Register compound under TSCA if new to US inventory to avoid EPA detention at entry
• Use GHS-compliant labeling for sulfonic acid corrosivity; common error is insufficient spill containment docs
• Confirm exact isomer via NMR/GC-MS; misidentification leads to wrong subheading
Related Products under HTS 2904.99.20.00
2-Nitrotoluene-5-sulfonic acid
2-Nitrotoluene-5-sulfonic acid is a sulfonated and nitrated derivative of toluene, featuring a nitro group at the ortho position and a sulfonic acid group at the meta position relative to the methyl group. It falls under HTS 2904.99.20.00 as a chemically defined nitrotoluenesulfonic acid, consistent with Chapter 29 notes for sulfonated, nitrated hydrocarbons. This compound is primarily used as an intermediate in dye synthesis.
6-Nitrotoluene-3-sulfonic acid
6-Nitrotoluene-3-sulfonic acid is the ortho-nitrated, meta-sulfonated toluene isomer, a separate chemically defined compound under HTS 2904.99.20.00. Fits Chapter 29 for nitrotoluenesulfonic acids, excluded from dyes or mixtures. Intermediate for acid dyes and optical brighteners.
2,4-Dinitrotoluene-5-sulfonic acid
This dinitro derivative features nitro groups at positions 2 and 4, with sulfonic acid at 5 on toluene, classified under HTS 2904.99.20.00 as nitrotoluenesulfonic acids including compound nitrated derivatives per chapter note. Meets criteria for sulfonated, nitrated hydrocarbons of heading 2904. Used in specialty dye and pharmaceutical synthesis.
Sodium 4-nitrotoluene-2-sulfonate
The sodium salt of 4-nitrotoluene-2-sulfonic acid, classified with the parent acid under HTS 2904.99.20.00 per Chapter 29 note 5(C)(1) for inorganic salts of organic acids. Retains sulfonated/nitrated toluene character without changing heading. Used in water-soluble dye formulations.