5-methoxy-1,3-isobenzofurandione
Also known as: 5-Methoxy-isobenzofuran-1,3-dione, 5-Methoxy-2-benzofuran-1,3-dione, 1,3-Isobenzofurandione, 5-methoxy-, 4-Methoxyphthalic anhydride, 5-Methoxy-1,3-dihydro-2-benzofuran-1,3-dione, 5-Methoxy-1,3-isobenzofurandione
5-methoxy-1,3-isobenzofurandione (CAS 28281-76-7) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H6O4 and a molecular weight of 178.141 g/mol. Key properties include a boiling point of 348.6±25.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 158.8±23.2 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 28281-76-7
- Jingsj CID
- J-1515957-6
- Molecular Formula
- C9H6O4
- Molecular Weight
- 178.141 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 348.6±25.0 °C at 760 mmHg |
|---|---|
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 158.8±23.2 °C |
| Exact Mass | 178.026611 |
| PSA | 52.60000 |
| LogP | 1.51 |
| Vapor Pressure | 0.0±0.8 mmHg at 25°C |
| Refractive Index | 1.584 |
Customs & Trade Information
| HS Code | 2932999099 |
|---|---|
| Summary | 2932999099. other heterocyclic compounds with oxygen 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 5-methoxy-1,3-isobenzofurandione?
The CAS number of 5-methoxy-1,3-isobenzofurandione is 28281-76-7.
What are the molecular formula and molecular weight of 5-methoxy-1,3-isobenzofurandione?
5-methoxy-1,3-isobenzofurandione has molecular formula C9H6O4 and molecular weight 178.141 g/mol.
What are the upstream and downstream products of 5-methoxy-1,3-isobenzofurandione?
For 5-methoxy-1,3-isobenzofurandione, Upstream Products: 4-Methoxyphthalic acid, 4-Methoxybenzoic anhydride, 1(3H)-Isobenzofuranone, 6-methoxy-; Downstream Products: 2-Methylanthraquinone, 5-Methoxyisoindolin-1-one, 5-Methoxyisobenzofuran-1(3H)-one.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "5-methoxy-1,3-isobenzofurandione (CAS 28281-76-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1515957-6 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.