Phthalimide
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported primarily as an imide rather than lactam
Imides of aromatic carboxylic acids are classified under 2925 if the cyclic imide structure dominates over lactam characteristics.
If for halogenated derivatives like N-bromophthalimide
Halogenated derivatives shift to earlier headings like 2908 per Chapter 29 note on halogenated compounds classified by last numerical order.
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Import Tips & Compliance
• 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)
Related Products under HTS 2933.79.15.00
N-Phenylphthalimide
N-Phenylphthalimide is a modified aromatic lactam where the nitrogen of phthalimide is substituted with a phenyl group, maintaining the heterocyclic nitrogen-only structure. Classified under HTS 2933.79.1500 as a modified aromatic lactam, it serves as an intermediate in dye production and pharmaceutical synthesis. Its aromatic nature and lactam functionality fit the subheading for other aromatic or modified aromatic lactams.
Succinimide
Succinimide is a cyclic imide (lactam) with a five-membered heterocyclic ring containing nitrogen, derived from succinic anhydride, and considered aromatic or modified aromatic in context. It is classified under HTS 2933.79.1500 as an other aromatic/modified aromatic lactam used in pharmaceutical intermediates like antiseizure drugs. Chapter notes confirm classification for chemically defined nitrogen-heterocyclic lactams.
1,8-Naphthalimide
1,8-Naphthalimide is an aromatic lactam featuring a fused naphthalene ring system with a nitrogen-containing heterocyclic imide group. It qualifies for HTS 2933.79.1500 as an aromatic lactam employed in fluorescent dyes and optical brighteners. The classification adheres to Chapter 29's priority for last numerical order among applicable heterocyclic headings.
Maleimide
Maleimide is an unsaturated five-membered aromatic lactam with a nitrogen hetero-atom, used in polymer chemistry and Diels-Alder reactions. Under HTS 2933.79.1500 as other aromatic lactams, it fits the heterocyclic nitrogen-only category per Chapter 29 definitions. Its chemically defined structure excludes it from earlier acyclic headings.
Glutaramide
Glutaramide is a modified aromatic six-membered lactam ring compound used in pharmaceutical and agrochemical synthesis. Classified in HTS 2933.79.1500 for other aromatic or modified aromatic lactams, it matches the chapter's scope for nitrogen-heterocyclic compounds. Notes confirm salts or derivatives stay with the parent lactam heading.
Isoindole-1,3-dione
Isoindole-1,3-dione, a structural isomer of phthalimide, is an aromatic fused-ring lactam with nitrogen hetero-atom. It is imported under HTS 2933.79.1500 as other aromatic lactams for use in resins and dyes. Classification follows Chapter 29's rule for last-in-order heterocyclic nitrogen compounds.