4,5-Dichloro-2-(pyridin-2-yl)pyridazin-3(2H)-one

Also known as: 4,5-Dichloro-2-pyridin-2-ylpyridazin-3-one, 4,5-Dichloro-2-(2-pyridinyl)pyridazin-3(2H)-one, 3(2H)-Pyridazinone, 4,5-dichloro-2-(2-pyridinyl)-, AKOS 90779, AKOS BBV-017632

4,5-Dichloro-2-(pyridin-2-yl)pyridazin-3(2H)-one (CAS 78389-19-2) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H5Cl2N3O and a molecular weight of 242.06100 g/mol. Key properties include a boiling point of 331.143ºC at 760 mmHg, a density of 1.546g/cm3 and a flash point of 154.07ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 78389-19-2
Jingsj CID: J-1108680-9
Molecular Formula: C₉H₅Cl₂N₃O
Molecular Weight: 242.06100 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	331.143ºC at 760 mmHg
Density	1.546g/cm3
Flash Point	154.07ºC
Exact Mass	240.98100
PSA	47.78000
LogP	1.93430
Refractive Index	1.678

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 4,5-Dichloro-2-(pyridin-2-yl)pyridazin-3(2H)-one?

The CAS number of 4,5-Dichloro-2-(pyridin-2-yl)pyridazin-3(2H)-one is 78389-19-2.

What are the molecular formula and molecular weight of 4,5-Dichloro-2-(pyridin-2-yl)pyridazin-3(2H)-one?

4,5-Dichloro-2-(pyridin-2-yl)pyridazin-3(2H)-one has molecular formula C9H5Cl2N3O and molecular weight 242.06100 g/mol.

What are the upstream and downstream products of 4,5-Dichloro-2-(pyridin-2-yl)pyridazin-3(2H)-one?

For 4,5-Dichloro-2-(pyridin-2-yl)pyridazin-3(2H)-one, Upstream Products: 2-Hydrazinopyridine, Mucochloric acid, 2-hydrazinylpyridine hydrochloride.

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. "4,5-Dichloro-2-(pyridin-2-yl)pyridazin-3(2H)-one (CAS 78389-19-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1108680-9 (accessed 2026-11-09).

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