Pyridine and its salts
Heterocyclic compounds with nitrogen hetero-atom(s) only: > Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure: > Pyridine and its salts
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Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
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Products classified under HTS 2933.31.00.00
Pyridine (CAS 110-86-1)
Pyridine is a flammable, colorless liquid heterocyclic organic compound with the molecular formula C5H5N, containing an unfused pyridine ring. It serves as a basic solvent and reagent in organic synthesis for pharmaceutical and agrochemical production. Classified under HTS 2933.31.00.00 as a chemically defined compound with a pyridine ring structure.
Pyridine Hydrochloride (CAS 628-13-7)
Pyridine hydrochloride is the crystalline salt form of pyridine with hydrochloric acid, used as a catalyst and reagent in organic reactions. It contains the pyridine ring structure meeting Chapter 29 note requirements for salts. Classified under HTS 2933.31.00.00 as a pyridine salt.
2-Aminopyridine (CAS 109-06-8)
2-Aminopyridine is an aromatic amine derivative containing an unfused pyridine ring with an amino group at position 2, used in pharmaceutical intermediates. Though amino-substituted, Chapter notes prioritize pyridine ring classification over nitrogen functions. Falls under HTS 2933.31.00.00 for pyridine compounds.
Pyridine-3-carboxylic Acid (Nicotinic Acid) (CAS 59-67-6)
Nicotinic acid, or vitamin B3, is a pyridine derivative with a carboxylic acid at position 3, essential for human nutrition and pharmaceutical use. The pyridine ring structure dictates classification under this heading per Chapter 29 notes on acid functions. HTS 2933.31.00.00 applies to this pyridine compound.
4-Dimethylaminopyridine (DMAP) (CAS 1122-58-3)
DMAP is a highly efficient nucleophilic catalyst used in esterification and acylation reactions, featuring a pyridine ring with dimethylamino substitution. Its primary classification follows the pyridine ring per Chapter 29 numerical order rule. HTS 2933.31.00.00 covers this compound.
Pyridinium Dichromate (CAS 14019-34-6)
Pyridinium dichromate is an orange crystalline compound used as an oxidizing agent in organic synthesis, formed from pyridine and chromic acid. Chapter notes specify classification with the organic pyridine component for coordination compounds. HTS 2933.31.00.00 applies.
Pyridine N-Oxide (CAS 694-59-7)
Pyridine N-oxide features the pyridine ring with oxygen bonded to the nitrogen atom, used as an intermediate in organic synthesis. The N-oxide maintains pyridine ring classification per heading scope. Covered by HTS 2933.31.00.00.
2-Picoline (2-Methylpyridine) (CAS 109-06-8)
2-Picoline is a liquid alkyl derivative of pyridine with a methyl group at position 2, used in agrochemical and pharmaceutical synthesis. Single substitution maintains pyridine classification. HTS 2933.31.00.00 applies to this base pyridine structure.
Pyridine Sulfate
Pyridine sulfate is the acidic salt formed from pyridine and sulfuric acid, used in analytical chemistry and as a reagent. Chapter 29 note (C)(1) requires classification with the organic pyridine base. HTS 2933.31.00.00 designation.