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Isonicotinic Acid N-Oxide

Also known as: Pyridine-4-carboxylic acid N-oxide, 4-Carboxypyridine 1-oxide, 1-oxidopyridin-1-ium-4-carboxylic acid, 4-pyridinecarboxylic acid 1-oxide, Isonicotinic acid N-oxide, MFCD00006209, EINECS 237-086-6

Isonicotinic Acid N-Oxide (CAS 13602-12-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C6H5NO3 and a molecular weight of 139.10900 g/mol. Key properties include a melting point of 270-271 °C(lit.), a boiling point of 469ºC at 760mmHg, a density of 1.34g/cm3 and a flash point of 237.4ºC. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
13602-12-5
Jingsj CID
J-1994135-6
Molecular Formula
C6H5NO3
Molecular Weight
139.10900 g/mol
Category
Organic Acids
Last updated
8/21/2026
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Physicochemical Properties

Melting Point270-271 °C(lit.)
Boiling Point469ºC at 760mmHg
Density1.34g/cm3
Flash Point237.4ºC
Exact Mass139.02700
PSA62.76000
LogP0.81330
Vapor Pressure1.34E-09mmHg at 25°C

GHS Safety & Compliance

IrritantSignal word: Warning
  • H315 — Causes skin irritation
  • H319 — Causes serious eye irritation
  • H335 — May cause respiratory irritation

Frequently Asked Questions

What is the CAS number of Isonicotinic Acid N-Oxide?

The CAS number of Isonicotinic Acid N-Oxide is 13602-12-5.

What are the molecular formula and molecular weight of Isonicotinic Acid N-Oxide?

Isonicotinic Acid N-Oxide has molecular formula C6H5NO3 and molecular weight 139.10900 g/mol.

Is Isonicotinic Acid N-Oxide hazardous?

Isonicotinic Acid N-Oxide has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of Isonicotinic Acid N-Oxide?

For Isonicotinic Acid N-Oxide, Upstream Products: Isonicotinic acid, 4-Methylpyridine, 3-Methylpyridine; Downstream Products: Isonipecotic acid, 2-Chloro-4-pyridinecarboxylic acid, Ethyl 2-chloroisonicotinate.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "Isonicotinic Acid N-Oxide (CAS 13602-12-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1994135-6 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.