1(2H)-Phthalazinone
Also known as: phthalazone, 1,2-dihydro-1-oxophthalazine, benzo[d]pyridazin-1(2H)-one, 1-oxophthalazine, 1-phthalazinol, phthalazin-1(2H)-one, 2H-phthalazin-1-one
1(2H)-Phthalazinone (CAS 119-39-1) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C8H6N2O and a molecular weight of 146.146 g/mol. Key properties include a melting point of 183-185 °C(lit.), a boiling point of 423.4±18.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 209.9±21.2 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 119-39-1
- Jingsj CID
- J-973855-0
- Molecular Formula
- C8H6N2O
- Molecular Weight
- 146.146 g/mol
- Category
- Ketones
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 183-185 °C(lit.) |
|---|---|
| Boiling Point | 423.4±18.0 °C at 760 mmHg |
| Density | 1.3±0.1 g/cm3 |
| Flash Point | 209.9±21.2 °C |
| Exact Mass | 146.048019 |
| PSA | 45.75000 |
| LogP | 0.82 |
| Vapor Pressure | 0.0±1.0 mmHg at 25°C |
| Refractive Index | 1.705 |
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 1(2H)-Phthalazinone?
The CAS number of 1(2H)-Phthalazinone is 119-39-1.
What are the molecular formula and molecular weight of 1(2H)-Phthalazinone?
1(2H)-Phthalazinone has molecular formula C8H6N2O and molecular weight 146.146 g/mol.
What are the upstream and downstream products of 1(2H)-Phthalazinone?
For 1(2H)-Phthalazinone, Upstream Products: 2-Carboxybenzaldehyde, Phthalazine, 2-Ketoglutaric acid; Downstream Products: Isoindoline, 1-Methoxyphthalazine, 1-Chlorophthalazine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "1(2H)-Phthalazinone (CAS 119-39-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-973855-0 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.