(4-Methylphenyl)-1-(2H)-phthalazinone

Also known as: 2-(p-Tolyl)phthalazin-1(2H)-one, 4-(4-Methylphenyl)phthalazin-1(2H)-one, 4-(4-Methylphenyl)-2H-phthalazin-1-one, 4-(p-Tolyl)phthalazin-1(2H)-one, 1(2H)-Phthalazinone, 4-(4-methylphenyl)-, 4-p-Tolyl-2H-phthalazin-1-one

(4-Methylphenyl)-1-(2H)-phthalazinone (CAS 51334-85-1) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C15H12N2O and a molecular weight of 236.26900 g/mol. Key property: a melting point of 250-255ºC(lit.). No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 51334-85-1
Jingsj CID: J-18041-6
Molecular Formula: C₁₅H₁₂N₂O
Molecular Weight: 236.26900 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	250-255ºC(lit.)
Exact Mass	236.09500
PSA	45.75000
LogP	2.89850

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-Methylphenyl)-1-(2H)-phthalazinone?

The CAS number of (4-Methylphenyl)-1-(2H)-phthalazinone is 51334-85-1.

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

(4-Methylphenyl)-1-(2H)-phthalazinone has molecular formula C15H12N2O and molecular weight 236.26900 g/mol.

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

For (4-Methylphenyl)-1-(2H)-phthalazinone, Upstream Products: 2-(4-Methylbenzoyl)benzoic acid, N-aminophthalimide, p-Tolylmagnesium bromide; Downstream Products: 1-Chloro-4-(4-methylphenyl)phthalazine, 3-(1-oxo-4-p-tolylphthalazin-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-Methylphenyl)-1-(2H)-phthalazinone (CAS 51334-85-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-18041-6 (accessed 2026-11-09).

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