4-(4-Chlorophenyl)phthalazin-1(2H)-one

Also known as: 4-(4-Chlorophenyl)-1(2H)-phthalazinone, 4-(4-Chlorophenyl)-2H-phthalazin-1-one, 1(2H)-Phthalazinone, 4-(4-chlorophenyl)-, 4-(4'-chlorophenyl)phthalazin-1-one, 4-(4-chloro-phenyl)-2H-phthalazin-1-one, 4-(4-chlorophenyl)-1-phthalazinol, MFCD00098133

4-(4-Chlorophenyl)phthalazin-1(2H)-one (CAS 51334-86-2) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C14H9ClN2O and a molecular weight of 256.68700 g/mol. Key properties include a melting point of 270-274ºC(lit.), a boiling point of 503.5ºC at 760 mmHg, a density of 1.36 g/cm3 and a flash point of 258.3ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 51334-86-2
Jingsj CID: J-16692-7
Molecular Formula: C₁₄H₉ClN₂O
Molecular Weight: 256.68700 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	270-274ºC(lit.)
Boiling Point	503.5ºC at 760 mmHg
Density	1.36 g/cm3
Flash Point	258.3ºC
Exact Mass	256.04000
PSA	45.75000
LogP	3.24350

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-(4-Chlorophenyl)phthalazin-1(2H)-one?

The CAS number of 4-(4-Chlorophenyl)phthalazin-1(2H)-one is 51334-86-2.

What are the molecular formula and molecular weight of 4-(4-Chlorophenyl)phthalazin-1(2H)-one?

4-(4-Chlorophenyl)phthalazin-1(2H)-one has molecular formula C14H9ClN2O and molecular weight 256.68700 g/mol.

What are the upstream and downstream products of 4-(4-Chlorophenyl)phthalazin-1(2H)-one?

For 4-(4-Chlorophenyl)phthalazin-1(2H)-one, Upstream Products: 2-(4-Chlorobenzoyl)benzoic acid, Phthalic anhydride.

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-(4-Chlorophenyl)phthalazin-1(2H)-one (CAS 51334-86-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-16692-7 (accessed 2026-11-09).

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