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
110%
Rate breakdown
9903.04.60100%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
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