2-Methyl-2,5-Dioxo-1-Oxa-2-Phospholane from Canada
2-Methyl-2,5-dioxo-1-oxa-2-phospholane is a cyclic phosphate ester explicitly named in HTS 2934.99.70.00, classified among other heterocyclic compounds. This organophosphorus compound with five-membered ring containing oxygen and phosphorus is used in polymer synthesis and as a phosphorylating agent.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.60100%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Include NMR and GC-MS spectra in documentation to confirm cyclic phospholane structure distinguishing from acyclic phosphates
• Classify as UN 3265 (corrosive liquid, acidic) and ensure proper inner packaging for air/sea transport
• Watch for TSCA inventory listing; pre-registration required for first import into US