Thiophenol
Thiophenol is a chemically defined organo-sulfur compound consisting of a benzene ring with a directly attached thiol group (-SH). It falls under HTS 2930.90.92 as an organo-sulfur compound other than those specified in earlier subheadings of heading 2930. This classification applies to pure thiols where sulfur is directly linked to carbon, distinguishing it from sulfonated or halogenated derivatives.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing a sulfur atom doubly linked to carbon and one oxygen atom
Compounds like sulfoxides with S=O linkage are classified earlier in 2930.90.29, taking precedence per chapter note on last numerical order.
If classified primarily as a derivative of benzene without emphasizing sulfur function
Simple aromatic thiols might be considered under hydrocarbon derivatives if sulfur linkage is not principal characteristic.
If imported as mixture with solvents exceeding transport/stabilizer allowances
Solutions beyond Chapter 29 note (e) limits fall under mixtures of Chapter 38.
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Import Tips & Compliance
• Provide detailed chemical analysis and purity certificates to confirm classification under Chapter 29 as a separate chemically defined compound
• Ensure SDS (Safety Data Sheets) accompany shipments due to toxicity and flammability; verify compliance with TSCA registration
• Avoid misclassification as aromatic hydrocarbons (Chapter 29 heading 2902) by documenting the thiol functional group
Related Products under HTS 2930.90.92
1-Butanethiol
1-Butanethiol (n-butyl mercaptan) is an acyclic aliphatic thiol with formula CH3(CH2)3SH, a separate chemically defined organo-sulfur compound. Classified in 2930.90.92 as other organo-sulfur compounds where sulfur is directly linked to carbon atom. Used in odorant applications and organic synthesis.
Ethyl 2-Mercaptoacetate
Ethyl 2-mercaptoacetate (HS-CH2COOCH2CH3) is an organo-sulfur ester with thiol group directly attached to carbon. Falls under HTS 2930.90.92 as other organo-sulfur compounds per chapter hierarchy. Used as intermediate in pharmaceutical synthesis.
2-Mercaptoethanol
2-Mercaptoethanol (HS-CH2CH2OH) contains both thiol (-SH) and alcohol (-OH) groups with sulfur directly linked to carbon. Classified in 2930.90.92 as other organo-sulfur compound taking precedence in numerical order. Common biochemical reagent for protein denaturation.
Dithiothreitol (DTT)
Dithiothreitol is a 1,4-dithiol compound (HOCH2(CHOH)2CH2SH)2 with two SH groups directly attached to carbon atoms. HTS 2930.90.92 covers this as other organo-sulfur compound used as reducing agent in biotech. Meets chapter definition for separate chemically defined compounds.
Lipoic Acid
Alpha-lipoic acid contains a five-membered dithiolane ring with sulfur atoms directly linked to carbon. Classified under 2930.90.92 as other organo-sulfur compound used as nutritional supplement and antioxidant. Qualifies per Chapter 29 notes for heterocyclic sulfur compounds.
Benzyl Mercaptan
Benzyl mercaptan (C6H5CH2SH) features a thiol group attached to benzyl carbon, making it an aromatic organo-sulfur compound. Falls in HTS 2930.90.92 as other beyond specific subheadings. Used in flavor/fragrance synthesis.