4-Phenyl-1(2H)-phthalazinone

Also known as: 1(2H)-Phthalazinone, 4-phenyl-, 4-Phenylphthalazin-1(2H)-one, 4-Phenyl-2-hydrophthalazin-1-one, 4-Phenyl-2H-phthalazin-1-one, 4-Phenylphthalazin-1-one, 1-hydroxy-4-phenylphthalazine, 1-phthalazinol, 4-phenyl-, 4-Phenyl-1-(2H)-phthalazinone, 4-Phenylphthalazin-1-ol, AKOS BBS-00000788, BUTTPARK 44\07-04, F3116-0061, MFCD00098272

4-Phenyl-1(2H)-phthalazinone (CAS 5004-45-5) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C14H10N2O and a molecular weight of 222.24200 g/mol. Key properties include a melting point of 240-244 °C(lit.), a boiling point of 406.4ºC at 760 mmHg, a density of 1.193g/cm3 and a flash point of 156.8ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 5004-45-5
Jingsj CID: J-13611-8
Molecular Formula: C₁₄H₁₀N₂O
Molecular Weight: 222.24200 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	240-244 °C(lit.)
Boiling Point	406.4ºC at 760 mmHg
Density	1.193g/cm3
Flash Point	156.8ºC
Exact Mass	222.07900
PSA	45.75000
LogP	2.59010
Refractive Index	1.589

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-Phenyl-1(2H)-phthalazinone?

The CAS number of 4-Phenyl-1(2H)-phthalazinone is 5004-45-5.

What are the molecular formula and molecular weight of 4-Phenyl-1(2H)-phthalazinone?

4-Phenyl-1(2H)-phthalazinone has molecular formula C14H10N2O and molecular weight 222.24200 g/mol.

What are the upstream and downstream products of 4-Phenyl-1(2H)-phthalazinone?

For 4-Phenyl-1(2H)-phthalazinone, Upstream Products: 2-Benzoylbenzoic acid, Phenylhydrazine, 2-Carboxybenzaldehyde; Downstream Products: 1-Chloro-4-phenylphthalazine, 4-phenyl-2H-phthalazine-1-thione, 3-(1-Oxo-4-phenylphthalazin-2(1H)-yl)propanenitrile.

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-Phenyl-1(2H)-phthalazinone (CAS 5004-45-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-13611-8 (accessed 2026-11-09).

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