Isoquinoline-1,3,4-trione
Also known as: 1,3,4(2H)-Isoquinolinetrione, 1,3,4(2H)-Isoquinoline-1,3,4-trione, Phthalonimide, 3deh, Isoquinoline-1,3,4(2H)-trione
Isoquinoline-1,3,4-trione (CAS 521-73-3) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H5NO3 and a molecular weight of 175.141 g/mol. Key property: a density of 1.4±0.1 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 521-73-3
- Jingsj CID
- J-1421493-8
- Molecular Formula
- C9H5NO3
- Molecular Weight
- 175.141 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Density | 1.4±0.1 g/cm3 |
|---|---|
| Exact Mass | 175.026947 |
| PSA | 63.24000 |
| LogP | 0.27 |
| Refractive Index | 1.609 |
Customs & Trade Information
| HS Code | 2933499090 |
|---|---|
| Summary | 2933499090. other compounds containing in the structure a quinoline or isoquinoline ring-system (whether or not hydrogenated), not further fused. 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 Isoquinoline-1,3,4-trione?
The CAS number of Isoquinoline-1,3,4-trione is 521-73-3.
What are the molecular formula and molecular weight of Isoquinoline-1,3,4-trione?
Isoquinoline-1,3,4-trione has molecular formula C9H5NO3 and molecular weight 175.141 g/mol.
What are the upstream and downstream products of Isoquinoline-1,3,4-trione?
For Isoquinoline-1,3,4-trione, Upstream Products: 3,4-Dihydroisoquinolin-1(2H)-one, Isoquinoline-1,3(2H,4H)-dione, Homophthalic anhydride; Downstream Products: N-Phenylphthalimide, 2-Methylisoquinoline-1,3,4-trione, 2-benzylisoquinoline-1,3,4-trione.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Isoquinoline-1,3,4-trione (CAS 521-73-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1421493-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.