Tributylphosphine
Tributylphosphine (PBu3) is a tertiary phosphine with three butyl groups attached to phosphorus, used in organic synthesis and catalysis. Classified under HTS 2931.49.00 as a non-halogenated organo-phosphorus derivative among other organo-inorganic compounds. Its air-sensitive nature requires stabilizer additions permitted by Chapter 29 note (f).
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More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If organo-arsenic instead of phosphorus
Heading 2931.10 specifically covers organo-arsenic compounds earlier in the tariff.
If primarily halogenated hydrocarbon without P-C bond
Halogenated derivatives without organo-inorganic character classified by parent hydrocarbon.
If supported on catalyst carrier for industrial use
Supported catalysts fall under Chapter 38 heading 3815 for prepared catalysts.
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Import Tips & Compliance
• Include stabilizer certificates if added for preservation, as allowed under Chapter 29 note (f)
• Label as UN 3254 for phosphine pyrophoric liquid classification during transport
• Avoid classification pitfalls by confirming no sulfur or metal-carbon bonds per heading 2930/2931 exclusions
Related Products under HTS 2931.49.00
Triphenylphosphine
Triphenylphosphine is an organophosphorus compound with the formula PPh3, containing phosphorus directly bonded to three carbon atoms of phenyl groups. It falls under HTS 2931.49.00 as a non-halogenated organo-phosphorus derivative, classified as 'other' organo-inorganic compounds per Chapter 29 notes. Primarily used as a ligand in organometallic catalysis and Wittig reaction reagent.
Triethylphosphite
Triethylphosphite (P(OEt)3) is an organophosphorus ester used in the synthesis of pesticides and flame retardants. It qualifies under HTS 2931.49.00 as a non-halogenated organo-phosphorus derivative, being a separate chemically defined compound per Chapter 29 note (a).
Diphenylphosphinic Acid
Diphenylphosphinic acid (Ph2P(O)OH) features phosphorus bound to two phenyl carbons and oxygen functions. Falls under HTS 2931.49.00 as non-halogenated organo-phosphorus among other organo-inorganic compounds. Used in polymer flame retardants and coordination chemistry.
Tris(2,4-di-tert-butylphenyl)phosphite
This sterically hindered phosphite (CAS 31570-04-4) serves as a secondary antioxidant in polymers. Classified HTS 2931.49.00 as non-halogenated organo-phosphorus derivative per Chapter 29 definitions. Three phenolic groups directly bonded to phosphorus atom.
Dibutyl Phosphite
Dibutyl phosphite (BuO)2P(O)H is a reactive organophosphorus compound used in flame retardants and pesticides. HTS 2931.49.00 covers it as non-halogenated organo-phosphorus derivative. Contains P-C bond through butyl chains and P-H functionality.
Ethyl Diphenylphosphinate
Ethyl diphenylphosphinate (Ph2P(O)OEt) combines phenyl-P-C bonds with ester functionality, used in specialty polymers. Falls under HTS 2931.49.00 as other non-halogenated organo-phosphorus compounds. Chapter 29 note 3(A) directs classification to later numerical heading.