4,5-Dichloro-2-(4-methylphenyl)-2,3-dihydropyridazin-3-one

Also known as: 3(2H)-Pyridazinone, 4,5-dichloro-2-(4-methylphenyl)-, 4,5-Dichloro-2-(4-methylphenyl)pyridazin-3-one, 4,5-Dichloro-2-(4-methylphenyl)pyridazin-3(2H)-one, 4,5-Dichloro-2-p-tolyl-2H-pyridazin-3-one, 4,5-Dichlor-2-p-tolyl-pyridazin-3-on, 4,5-Dichloro-2-(p-tolyl)pyridazin-3(2h)-one, 1-p-Tolyl-4,5-dichlor-6-pyridazon, 4,5-dichloro-2-(4-methylphenyl)-2-hydropyridazin-3-one, AKOS B029266

4,5-Dichloro-2-(4-methylphenyl)-2,3-dihydropyridazin-3-one (CAS 33098-21-4) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C11H8Cl2N2O and a molecular weight of 255.10000 g/mol. Key properties include a melting point of 144ºC, a boiling point of 339.4ºC at 760mmHg and a density of 1.39g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 33098-21-4
Jingsj CID: J-1492714-1
Molecular Formula: C₁₁H₈Cl₂N₂O
Molecular Weight: 255.10000 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	144ºC
Boiling Point	339.4ºC at 760mmHg
Density	1.39g/cm3
Exact Mass	254.00100
PSA	34.89000
LogP	2.84770
Refractive Index	1.627

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-(4-methylphenyl)-2,3-dihydropyridazin-3-one?

The CAS number of 4,5-Dichloro-2-(4-methylphenyl)-2,3-dihydropyridazin-3-one is 33098-21-4.

What are the molecular formula and molecular weight of 4,5-Dichloro-2-(4-methylphenyl)-2,3-dihydropyridazin-3-one?

4,5-Dichloro-2-(4-methylphenyl)-2,3-dihydropyridazin-3-one has molecular formula C11H8Cl2N2O and molecular weight 255.10000 g/mol.

What are the upstream and downstream products of 4,5-Dichloro-2-(4-methylphenyl)-2,3-dihydropyridazin-3-one?

For 4,5-Dichloro-2-(4-methylphenyl)-2,3-dihydropyridazin-3-one, Upstream Products: 3,4-dichloro-5-hydroxy-5H-furan-2-one, 4-Methylphenylhydrazine.

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-(4-methylphenyl)-2,3-dihydropyridazin-3-one (CAS 33098-21-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1492714-1 (accessed 2026-11-09).

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