C5H5NO
95.1 g/mol
OtherWarning
Pyridine-N-oxide
CAS694-59-7EC211-774-6
Category
Other
Compound Class
n.a
Primary Use
chemical intermediate
Pyridine-N-oxide is a chemical compound derived from pyridine by oxidation, featuring a polar N→O bond. It is highly hygroscopic and has been studied in crystallization behavior from aqueous solutions.
intermediate in chemical synthesis
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Safety Reference
Warning
H302Harmful if swallowed
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for Pyridine-N-oxide (CAS 694-59-7) is 2933.39.
HS code (international, 6-digit)
2933.39
EU CN code (8-digit)
2933 39 99
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
1-oxidopyridin-1-ium
InChIKey
ILVXOBCQQYKLDS-UHFFFAOYSA-N
SMILES
C1=CC=[N+](C=C1)[O-]
Synonyms (7)
- 1-Oxo-1lambda~5~-pyridine
- 1-oxidopyridin-1-ium
- PY N-oxide
- Pyridine 1-oxide
- Pyridine oxide
- Pyridine-N-oxide
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