5-Phenylpyrazin-2(1H)-one

Also known as: 5-Phenyl-1H-pyrazin-2-one, 5-Phenyl-2-hydroxypyrazine, 2-Hydroxy-5-phenylpyrazine, 5-Phenyl-1,2-dihydropyrazin-2-one, 5-Phenylpyrazine-2-ol, 5-Phenylpyrazinol, 2(1H)-Pyrazinone, 5-phenyl-, Pyrazine, 2-hydroxy-5-phenyl-

5-Phenylpyrazin-2(1H)-one (CAS 25844-72-8) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C10H8N2O and a molecular weight of 172.18300 g/mol. Key properties include a boiling point of 473.4ºC at 760mmHg, a density of 1.2g/cm3 and a flash point of 240.1ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 25844-72-8
Jingsj CID: J-1360809-8
Molecular Formula: C₁₀H₈N₂O
Molecular Weight: 172.18300 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	473.4ºC at 760mmHg
Density	1.2g/cm3
Flash Point	240.1ºC
Exact Mass	172.06400
PSA	45.75000
LogP	1.43690
Vapor Pressure	1.39E-09mmHg at 25°C
Refractive Index	1.623

Customs & Trade Information

HS Code	2933990090
Summary	2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 5-Phenylpyrazin-2(1H)-one?

The CAS number of 5-Phenylpyrazin-2(1H)-one is 25844-72-8.

What are the molecular formula and molecular weight of 5-Phenylpyrazin-2(1H)-one?

5-Phenylpyrazin-2(1H)-one has molecular formula C10H8N2O and molecular weight 172.18300 g/mol.

What are the upstream and downstream products of 5-Phenylpyrazin-2(1H)-one?

For 5-Phenylpyrazin-2(1H)-one, Upstream Products: Glycinamide hydrochloride, Phenylglyoxal monohydrate, N,N-Dimethylformamide; Downstream Products: 2-Bromo-5-phenylpyrazine, 2-Phenylpyrazine.

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

Last updated: 8/21/2026

How to cite: Jingsj. "5-Phenylpyrazin-2(1H)-one (CAS 25844-72-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1360809-8 (accessed 2026-11-09).

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