Pyridine N-Oxide
Pyridine N-oxide is the N-oxidized derivative of pyridine, used in organic synthesis as oxidant and directing group. Falls under HTS 2933.39.92.00 as 'other' pyridine ring compound; N-oxide maintains unfused pyridine classification per HTS. Excluded if in coordination complexes.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing epoxide or similar excluded ring
Chapter notes exclude certain cyclic structures from 2933-2934.
If classified as ether-alcohol derivative
Diols/polyols under 2909, but N-oxide pyridine specificity controls.
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Import Tips & Compliance
• Oxidizer hazard class 5.1 (UN 1479); purity via HPLC
• Avoid Chapter 28 classification error
Related Products under HTS 2933.39.92.00
Nicotine Bitartrate Dihydrate
Nicotine bitartrate dihydrate is a salt of nicotine, a heterocyclic compound containing a pyridine ring, used in smoking cessation therapies and pesticides. It falls under HTS 2933.39.92.00 as 'other' unfused pyridine ring compounds with nitrogen hetero-atoms only. This classification applies to pure chemical forms meeting Chapter 29 notes for separate chemically defined organic compounds.
Pyridine-3-Carboxylic Acid (Nicotinic Acid)
Nicotinic acid, also known as vitamin B3, is a pyridine derivative with a carboxylic acid group at position 3, used as a nutritional supplement and in pharmaceuticals. Classified under HTS 2933.39.92.00 as an 'other' compound containing an unfused pyridine ring per Chapter 29 specifications. Excludes vitamin preparations put up for retail sale.
4-Dimethylaminopyridine (DMAP)
DMAP is a pyridine derivative with a dimethylamino substituent at position 4, widely used as a catalyst in organic synthesis and peptide coupling reactions. It qualifies for HTS 2933.39.92.00 as an 'other' unfused pyridine compound with nitrogen hetero-atoms only, meeting Chapter 29 purity requirements. Common in pharmaceutical manufacturing.
2,6-Lutidine (2,6-Dimethylpyridine)
2,6-Lutidine is a dimethyl-substituted pyridine used as a solvent, intermediate in agrochemicals, and ligand in organometallic catalysis. Falls under HTS 2933.39.92.00 as 'other' pyridine ring compounds with only nitrogen hetero-atoms. Excluded if in mixtures rendering it suitable for specific non-chemical uses.
Isonicotinic Acid Hydrazide (INH, Isoniazid Bulk)
Isoniazid is a pyridine-4-carboxylic acid hydrazide used as bulk active for tuberculosis treatment. Classified in HTS 2933.39.92.00 as 'other' unfused pyridine derivative per Chapter 29 notes for chemically defined compounds. Distinguish from finished pharmaceutical dosage forms.
Ethyl 2-Picolinate
Ethyl 2-picolinate is the ethyl ester of picolinic acid (pyridine-2-carboxylic acid), used in pharmaceutical intermediates and metal chelation. HTS 2933.39.92.00 applies per Chapter 29 note (A) classifying esters with the acid-function parent compound. Meets criteria for chemically pure organic compound.