Trioxane Pharmaceutical Intermediate
Trioxane is a heterocyclic compound with oxygen hetero-atoms forming a six-membered ring, used as an intermediate in pharmaceutical synthesis. It falls under HTS 2932.99.90 as a heterocyclic compound with oxygen hetero-atoms only, not elsewhere specified in heading 2932. This classification applies to pure chemical forms without additional functional groups that would shift it to other subheadings.
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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 specifically enumerated in statistical suffix
Certain named oxygen heterocycles like specific furans have dedicated subheadings earlier in 2932, taking precedence per numerical order rule.
If supplied as mixture with solvents for transport
Solutions in solvents render it a chemical preparation of Chapter 38 if not solely for safety/transport per Chapter 29 note (e).
If acyclic ether derivative rather than heterocyclic
Acyclic ethers fall in heading 2909; only true heterocyclic ring structures with oxygen qualify for Chapter 29 heading 2932.
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Import Tips & Compliance
• Verify chemical purity and structure via Certificate of Analysis to confirm it meets Chapter 29 note (a) for separate chemically defined compounds
• Include Safety Data Sheets (SDS) showing no added solvents or stabilizers that could trigger reclassification under notes (e) or (f)
• Avoid common pitfall of classifying as polymers; trioxane is excluded from 2932 per chapter notes if considered cyclic polymer of aldehydes
Related Products under HTS 2932.99.90
Morpholine Industrial Grade
Morpholine is a six-membered heterocyclic ring with one oxygen and one nitrogen hetero-atom, but classified here due to oxygen hetero-atom specification. Used in rubber curing and corrosion inhibitors. HTS 2932.99.90 as other oxygen-containing heterocycles.
Crown Ether 18-Crown-6
18-Crown-6 is a macrocyclic polyether with six oxygen hetero-atoms in 18-membered ring, used for phase transfer catalysis. HTS 2932.99.90 covers as other oxygen heterocyclic compounds. Excluded from acyclic ethers of heading 2909.
Epichlorohydrin (Pure)
Epichlorohydrin is a three-membered epoxide ring with oxygen hetero-atom and chloromethyl group, precursor for epoxy resins. Despite epoxide note exclusion, classified 2932.99.90 as halogenated oxygen heterocycle. Chapter notes distinguish from simple epoxides.
Diglyme (Diethylene Glycol Dimethyl Ether)
Diglyme is a heterocyclic diether with oxygen hetero-atoms in flexible ring conformation, used in organometallic chemistry. HTS 2932.99.90 as other oxygen heterocycles distinguished from acyclic ethers.
2-Methyltetrahydrofuran
2-Methyltetrahydrofuran (2-MeTHF) is a five-membered oxygen heterocyclic ring with methyl substitution, bio-based solvent alternative to THF. Classified HTS 2932.99.90 as substituted oxygen heterocycle.
Butyrolactam (2-Pyrrolidone)
2-Pyrrolidone contains oxygen in lactam structure (five-membered ring), used in pharmaceuticals and polymers. Dual O/N heteroatoms but oxygen heading applies. HTS 2932.99.90 classification.