1H-Pyrazolo[3,4-c]pyridazin-3(2H)-one

Also known as: 1,2-dihydropyrazolo[3,4-c]pyridazin-3-one, 3H-Pyrazolo[3,4-c]pyridazin-3-one, 1,2-dihydro-

1H-Pyrazolo[3,4-c]pyridazin-3(2H)-one (CAS 2125-85-1) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H4N4O and a molecular weight of 136.11100 g/mol. Key properties include a boiling point of 459.827ºC at 760 mmHg, a density of 1.702g/cm3 and a flash point of 231.895ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 2125-85-1
Jingsj CID: J-1497705-0
Molecular Formula: C₅H₄N₄O
Molecular Weight: 136.11100 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	459.827ºC at 760 mmHg
Density	1.702g/cm3
Flash Point	231.895ºC
Exact Mass	136.03900
PSA	74.69000
LogP	0.05850
Vapor Pressure	0mmHg at 25°C
Refractive Index	1.816

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 1H-Pyrazolo[3,4-c]pyridazin-3(2H)-one?

The CAS number of 1H-Pyrazolo[3,4-c]pyridazin-3(2H)-one is 2125-85-1.

What are the molecular formula and molecular weight of 1H-Pyrazolo[3,4-c]pyridazin-3(2H)-one?

1H-Pyrazolo[3,4-c]pyridazin-3(2H)-one has molecular formula C5H4N4O and molecular weight 136.11100 g/mol.

What are the upstream and downstream products of 1H-Pyrazolo[3,4-c]pyridazin-3(2H)-one?

For 1H-Pyrazolo[3,4-c]pyridazin-3(2H)-one, Upstream Products: Methyl 2-aminothiophene-3-carboxylate.

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. "1H-Pyrazolo[3,4-c]pyridazin-3(2H)-one (CAS 2125-85-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1497705-0 (accessed 2026-11-09).

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