1-(p-Sulfophenyl)-3-methyl pyrazolone
A pyrazolone derivative with a para-sulfophenyl substituent at position 1 and methyl at position 3 on the unfused pyrazole ring. Classified in HTS 2933.19.18.00 as a specifically enumerated aromatic heterocyclic compound. Widely employed as a coupler in azo dye manufacturing.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If sulfonic acid group defines primary character
Derived sulfonated aromatics without strong heterocyclic identity classify earlier in 2904.
If modified as sugar ether or ester derivative
Sugar derivatives of heterocycles fall under later heading 2940 per chapter note 2(c).
If supplied with anti-dusting agent
Additions for safety like anti-dusting agents may reclassify to Chapter 38 mixtures per note 2(g).
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Import Tips & Compliance
• Include TSCA certification for US import; use acid-resistant packaging for sulfonic group; confirm batch purity exceeds 98%
Related Products under HTS 2933.19.18.00
2-Chloro-5-sulfophenylmethylpyrazolone
This is a specific aromatic pyrazolone derivative containing a chlorine and sulfonic acid group on a phenyl ring attached to a pyrazole structure. It falls under HTS 2933.19.18.00 as one of the explicitly named heterocyclic compounds with an unfused pyrazole ring that is aromatic or modified aromatic. Primarily used as an intermediate in dye synthesis and pharmaceutical production.
2,5-Dichloro-4-(3-methyl-5-oxo-2-pyrazolin-1-yl) benzenesulfonic acid
A complex aromatic pyrazolone featuring dichloro substitution and a sulfonic acid on a benzene ring linked to a pyrazoline structure. Classified under HTS 2933.19.18.00 as a specifically listed compound with an unfused pyrazole ring (hydrogenated form). Used in manufacturing azo dyes and pigments.
Phenyl carbethoxypyrazolone
An ester derivative of pyrazolone with a phenyl group and ethoxycarbonyl substituent on the heterocyclic ring. It matches HTS 2933.19.18.00 as a named aromatic pyrazolone compound with unfused pyrazole ring. Serves as a key intermediate in pharmaceutical synthesis, particularly for analgesics.
m-Sulfaminopyrazolone (m-Sulfamido-phenyl methyl pyrazolone)
This compound features a sulfamido group at the meta position of a phenyl ring attached to a methylpyrazolone structure. Explicitly listed under HTS 2933.19.18.00 for its aromatic pyrazole ring system. Commonly used in the production of reactive dyes for textiles.