5-Methyl-1(3H)-isobenzofuranone
Also known as: 5-Methylphthalide, 5-Methyl-1,3-dihydroisobenzofuran-1-one, 5-Methyl-3H-isobenzofuran-1-one, 5-methyl-3H-2-benzofuran-1-one, 1(3H)-Isobenzofuranone, 5-methyl-, 5-Methylisobenzofuran-1(3H)-one
5-Methyl-1(3H)-isobenzofuranone (CAS 54120-64-8) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H8O2 and a molecular weight of 148.15900 g/mol. Key properties include a boiling point of 329.2ºC at 760 mmHg, a density of 1.211g/cm3 and a flash point of 136.1ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 54120-64-8
- Jingsj CID
- J-22045-1
- Molecular Formula
- C9H8O2
- Molecular Weight
- 148.15900 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 329.2ºC at 760 mmHg |
|---|---|
| Density | 1.211g/cm3 |
| Flash Point | 136.1ºC |
| Exact Mass | 148.05200 |
| PSA | 26.30000 |
| LogP | 1.66540 |
| Refractive Index | 1.574 |
Customs & Trade Information
| HS Code | 2932209090 |
|---|---|
| Summary | 2932209090. other lactones. 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-Methyl-1(3H)-isobenzofuranone?
The CAS number of 5-Methyl-1(3H)-isobenzofuranone is 54120-64-8.
What are the molecular formula and molecular weight of 5-Methyl-1(3H)-isobenzofuranone?
5-Methyl-1(3H)-isobenzofuranone has molecular formula C9H8O2 and molecular weight 148.15900 g/mol.
What are the upstream and downstream products of 5-Methyl-1(3H)-isobenzofuranone?
For 5-Methyl-1(3H)-isobenzofuranone, Upstream Products: 2,4-Dimethylbenzoic acid, methyl 2,4-dimethylbenzoate, 4-Methylbenzoic acid.
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-Methyl-1(3H)-isobenzofuranone (CAS 54120-64-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-22045-1 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.