Pyrido[3,4-b]pyrazine

Also known as: 1,4,6-Triazanaphthalin, 1,4,6-triazanaphthalene, 6-azaquinoxaline, Pyrido[3,4-b]pyrazine (6CI,7CI,8CI,9CI), pyridino[3,4-b]pyrazine, pyrido<3,4-b>pyrazine

Pyrido[3,4-b]pyrazine (CAS 254-86-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C7H5N3 and a molecular weight of 131.135 g/mol. Key properties include a boiling point of 273.5±20.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 128.7±14.7 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 254-86-4
Jingsj CID: J-1047695-6
Molecular Formula: C₇H₅N₃
Molecular Weight: 131.135 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	273.5±20.0 °C at 760 mmHg
Density	1.3±0.1 g/cm3
Flash Point	128.7±14.7 °C
Exact Mass	131.048340
PSA	38.67000
LogP	-0.19
Vapor Pressure	0.0±0.5 mmHg at 25°C
Refractive Index	1.666

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 Pyrido[3,4-b]pyrazine?

The CAS number of Pyrido[3,4-b]pyrazine is 254-86-4.

What are the molecular formula and molecular weight of Pyrido[3,4-b]pyrazine?

Pyrido[3,4-b]pyrazine has molecular formula C7H5N3 and molecular weight 131.135 g/mol.

What are the upstream and downstream products of Pyrido[3,4-b]pyrazine?

For Pyrido[3,4-b]pyrazine, Upstream Products: 3,4-Diaminopyridine, Glyoxal sodium bisulfite hydrate; Downstream Products: 8-bromopyrido[3,4-b]pyrazine.

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. "Pyrido[3,4-b]pyrazine (CAS 254-86-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1047695-6 (accessed 2026-11-09).

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