2933.79.15.00/Phthalimide/Canada

Phthalimide from Canada

Phthalimide is an aromatic heterocyclic lactam compound derived from phthalic anhydride, featuring a five-membered ring with a nitrogen hetero-atom fused to a benzene ring. It falls under HTS 2933.79.1500 as an aromatic lactam used primarily as a chemical intermediate in organic synthesis, such as for the Gabriel synthesis of primary amines. This classification aligns with Chapter 29 notes for separate chemically defined organic compounds with nitrogen hetero-atoms.

Duty Rate — Canada → United States

110%

Rate breakdown

9903.04.6093.5%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

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Import Tips

• Verify purity certificates to confirm it meets 'chemically defined' criteria under Chapter 29; ensure SDS includes handling as a potential irritant

• Common pitfall: misclassification as a simple amide under 2924 if not emphasizing lactam structure

• Label containers clearly for transport stabilizers if added per note (f)