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 > Pyridine and its salts
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Products classified under Tariff item 2933.31
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. It is used as an intermediate in pharmaceutical synthesis. Despite the amino substitution, the pyridine ring remains the core structure, and Chapter 29 notes do not exclude it from heading 29.33.
2933.31.002-Picoline (2-Methylpyridine) (CAS 109-06-8)
2-Picoline (2-Methylpyridine) is a liquid alkyl derivative of pyridine with a methyl group at position 2. It is used in agrochemical and pharmaceutical synthesis. The single methyl substitution does not alter the pyridine ring classification.
2933.31.004-Dimethylaminopyridine (DMAP) (CAS 1122-58-3)
4-Dimethylaminopyridine (DMAP) is a nucleophilic catalyst used in esterification and acylation reactions. It features a pyridine ring with a dimethylamino substitution at position 4. The pyridine ring structure dictates classification under this heading.
2933.31.00Pyridine-3-carboxylic Acid (Nicotinic Acid) (CAS 59-67-6)
Nicotinic acid (pyridine-3-carboxylic acid) is a pyridine derivative with a carboxylic acid group at position 3. It is essential for human nutrition as vitamin B3 and used in pharmaceutical applications. The pyridine ring structure determines classification.
2933.31.00Pyridine (CAS 110-86-1)
Pyridine is a flammable, colorless liquid heterocyclic organic compound with the molecular formula C5H5N. It contains an unfused pyridine ring and serves as a basic solvent and reagent in organic synthesis for pharmaceuticals and agrochemicals.
2933.31.00Pyridine Hydrochloride (CAS 628-13-7)
Pyridine hydrochloride is the crystalline salt form of pyridine with hydrochloric acid. It is used as a catalyst and reagent in organic reactions. The pyridine ring structure meets Chapter 29 note requirements for classification.
2933.31.00Pyridine N-Oxide (CAS 694-59-7)
Pyridine N-oxide features the pyridine ring with an oxygen atom bonded to the nitrogen atom. It is used as an intermediate in organic synthesis. The N-oxide maintains pyridine ring classification per heading scope.
2933.31.00Pyridine Sulfate
Pyridine sulfate is the acidic salt formed from pyridine and sulfuric acid. It is used in analytical chemistry and as a reagent. Chapter 29 note (C)(1) requires classification with the organic pyridine base.
2933.31.00Pyridinium Dichromate (CAS 14019-34-6)
Pyridinium dichromate is an orange crystalline compound used as an oxidizing agent in organic synthesis. It is formed from pyridine and chromic acid. Chapter notes specify classification with the organic pyridine component.