Diethyl Chloromethylphosphonate from Canada
This phosphonate ester with chloromethyl substitution serves as a pharmaceutical intermediate and reagent in organic synthesis. HTS 2931.59.00 applies due to halogenated organo-phosphorus structure meeting chapter note requirements.
Duty Rate — Canada → United States
13.7%
Rate breakdown
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
• Document CAS registry number 1066-86-8 for customs verification
• Monitor DEA List I chemical status for narcotic precursor potential
• Use nitrogen-blanketed containers to prevent hydrolysis