Paraldehyde Stabilized USP
Paraldehyde is trimeric acetaldehyde forming six-membered oxygen heterocyclic ring, used as hypnotic pharmaceutical under USP standards. Stabilized with sulfuric acid traces per Chapter note 2(f), classified 2932.99.90.90. Excluded from aldehyde heading 2912 by cyclic polymer note 5.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If monomeric acetaldehyde predominates
Monomers classify under aldehyde heading before cyclic polymers
If formulated 5-10% in oral solution
Medicinal formulations shift to Chapter 30
If depolymerization stabilizer exceeds limits
Excessive stabilizers disqualify under Chapter note 2(f)
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Import Tips & Compliance
• DEA import permit required for hypnotic substance regardless of quantity
• Acid stabilizer <0.01% prevents 2811 inorganic acid classification
• Light-resistant amber glass mandatory per USP monograph
Related Products under HTS 2932.99.90.90
Trioxane Pharmaceutical Intermediate
Trioxane is a heterocyclic compound with oxygen hetero-atoms only, used as an intermediate in pharmaceutical synthesis for antimalarial drugs like artemisinin derivatives. It features a six-membered ring with three oxygen atoms, fitting precisely under HTS 2932.99 for other heterocyclic oxygen compounds not elsewhere specified. This pure chemical compound meets Chapter 29 requirements for separate chemically defined organic compounds.
Morpholine Technical Grade
Morpholine features a six-membered heterocyclic ring containing two oxygen and two nitrogen hetero-atoms, used in rubber vulcanization and pharmaceutical synthesis. Despite nitrogen presence, classified by last numerical heading rule at 2932.99.90.90 when oxygen hetero-atom structure predominates. Meets Chapter 29 definition for heterocyclic compounds.
Tetrahydrofuran Stabilized
Tetrahydrofuran (THF) is a five-membered heterocyclic ring with one oxygen hetero-atom, essential solvent for Grignard reactions and polymer processing. Stabilized grade contains BHT to prevent peroxide formation during transport, qualifying under Chapter 29 note 2(f). Classified at 2932.99.90.90 as other oxygen heterocyclic compounds.
2-Methyltetrahydrofuran Bio-Based
2-Methyltetrahydrofuran (2-MeTHF) is a five-membered oxygen heterocyclic derived from renewable furfural, used as green solvent replacing THF in pharma manufacturing. Bio-based variants maintain identical chemical structure qualifying under 2932.99.90.90. Chemically defined heterocyclic compound per Chapter 29 definitions.
Dioxolane Monomer
1,3-Dioxolane features a five-membered ring with two oxygen hetero-atoms, used as comonomer in polyacetal resin production and pharma intermediates. Pure monomer form qualifies as heterocyclic oxygen compound under HTS 2932.99.90.90. Excluded from cyclic ester provisions by Chapter note 5.
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 and metal ion complexation. Pure compound qualifies under 2932.99.90.90 as heterocyclic oxygen compound not specifically excluded. Chemically defined per Chapter 29 note 1(a).