4,5-Dichloro-2-methyl-3(2H)-pyridazinone

Also known as: 4,5-Dichloro-2-methylpyridazin-3(2H)-one, 4,5-Dichloro-2-methyl-2H-pyridazin-3-one, 4,5-Dichloro-2-methylpyridazin-3-one, 3(2H)-Pyridazinone, 4,5-dichloro-2-methyl-, 4,5-Dichloro-2-methyl-2H-pyridazin-3-one

4,5-Dichloro-2-methyl-3(2H)-pyridazinone (CAS 933-76-6) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C5H4Cl2N2O and a molecular weight of 179.004 g/mol. Key properties include a melting point of 87-91ºC(lit.), a boiling point of 197.2±50.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 73.1±30.1 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H315 — Causes skin irritation and H317 — May cause an allergic skin reaction. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 933-76-6
Jingsj CID: J-15098-1
Molecular Formula: C₅H₄Cl₂N₂O
Molecular Weight: 179.004 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	87-91ºC(lit.)
Boiling Point	197.2±50.0 °C at 760 mmHg
Density	1.6±0.1 g/cm3
Flash Point	73.1±30.1 °C
Exact Mass	177.970062
PSA	34.89000
LogP	-0.34
Vapor Pressure	0.4±0.4 mmHg at 25°C
Refractive Index	1.612

GHS Safety & Compliance

Acute ToxicitySignal word: Danger

H301 — Toxic if swallowed
H315 — Causes skin irritation
H317 — May cause an allergic skin reaction
H319 — Causes serious eye irritation
H335 — May cause respiratory irritation

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-methyl-3(2H)-pyridazinone?

The CAS number of 4,5-Dichloro-2-methyl-3(2H)-pyridazinone is 933-76-6.

What are the molecular formula and molecular weight of 4,5-Dichloro-2-methyl-3(2H)-pyridazinone?

4,5-Dichloro-2-methyl-3(2H)-pyridazinone has molecular formula C5H4Cl2N2O and molecular weight 179.004 g/mol.

Is 4,5-Dichloro-2-methyl-3(2H)-pyridazinone hazardous?

4,5-Dichloro-2-methyl-3(2H)-pyridazinone has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H315 — Causes skin irritation; H317 — May cause an allergic skin reaction.

What are the upstream and downstream products of 4,5-Dichloro-2-methyl-3(2H)-pyridazinone?

For 4,5-Dichloro-2-methyl-3(2H)-pyridazinone, Upstream Products: 4,5-Dichloro-3(2H)-pyridazinone, iodomethane, Mucochloric acid; Downstream Products: Chloridazon-methyl-desphenyl, 5-Amino-2-methyl-2,3-dihydropyridazin-3-one, 4-Chloro-5-methoxy-2-methylpyridazin-3(2H)-one.

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-methyl-3(2H)-pyridazinone (CAS 933-76-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-15098-1 (accessed 2026-11-09).

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