Phthalimide
Phthalimide is a cyclic imide derived from phthalic anhydride, featuring a five-membered imide ring fused to a benzene ring. It falls under HTS 2925.19.91.00 as a carboxyimide-function compound (imide) and its derivative, not specifically named elsewhere in heading 2925. Commonly used as an intermediate in organic synthesis for pharmaceuticals and agrochemicals.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as crude or technical grade with purity <95%
Lower purity polycarboxylic anhydrides or derivatives may shift to earlier chapter 29 heading for anhydrides.
If blended with solvents for safe transport
Solutions of chapter 29 compounds in solvents for transport fall under mixtures of heading 3824 if not qualifying under chapter note (e).
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Import Tips & Compliance
• Provide Certificate of Analysis (CoA) confirming chemical identity and purity >98% to avoid misclassification as technical grade
• Ensure proper UN packaging group II labeling for irritant properties; common pitfall is insufficient hazard documentation
• Declare exact CAS number (85-41-6) on commercial invoice to facilitate CBP review
Related Products under HTS 2925.19.91.00
Succinimide
Succinimide is a five-membered cyclic imide derived from succinic anhydride, a simple aliphatic carboxyimide-function compound. Classified under HTS 2925.19.91.00 as an 'other' imide not specifically provided for in prior subheadings. Used in synthesis of pharmaceuticals like ethosuximide and as a reagent in organic chemistry.
Glutarimide
Glutarimide is a six-membered cyclic imide derived from glutaric acid, a carboxyimide-function compound. Falls under HTS 2925.19.91.00 as 'other' imides; used in production of pharmaceuticals like thalidomide analogs and as a corrosion inhibitor.
Maleimide
Maleimide is an unsaturated five-membered cyclic imide with a reactive double bond, used in polymer chemistry and bioconjugation. Classified in HTS 2925.19.91.00 as a derivative imide; the imide function determines classification over unsaturation.
N-Phenylmaleimide
N-Phenylmaleimide is an N-substituted derivative of maleimide with a phenyl group on nitrogen, used in high-performance polymer synthesis. HTS 2925.19.91.00 covers this substituted imide as 'other' derivatives; aryl substitution doesn't change heading.
Diphenylmaleimide
Diphenylmaleimide features two phenyl groups on the imide nitrogen, used in specialty resins and electronics. As a substituted cyclic imide derivative, it properly classifies under HTS 2925.19.91.00 'other' imides.
Benzylisatin
Benzylisatin is an indole derivative containing an imide functionality, used in synthesis of pharmaceuticals and dyes. The dominant imide function places it under HTS 2925.19.91.00 as 'other' imide derivatives.