Homophthalic anhydride
Also known as: 1,3-Isochromandione, 1H-2-Benzopyran-1,3(4H)-dione, 1H-Isochromene-1,3(4H)-dione, 4H-isochromene-1,3-dione, Homophthalic acid anhydride, o-Carboxyphenylacetic anhydride
Homophthalic anhydride (CAS 703-59-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C9H6O3 and a molecular weight of 162.142 g/mol. Key properties include a melting point of 140-142 °C(lit.), a boiling point of 324.5±35.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 159.0±23.1 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 703-59-3
- Jingsj CID
- J-15301-5
- Molecular Formula
- C9H6O3
- Molecular Weight
- 162.142 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 140-142 °C(lit.) |
|---|---|
| Boiling Point | 324.5±35.0 °C at 760 mmHg |
| Density | 1.3±0.1 g/cm3 |
| Flash Point | 159.0±23.1 °C |
| Exact Mass | 162.031693 |
| PSA | 43.37000 |
| LogP | 0.41 |
| Vapor Pressure | 0.0±0.7 mmHg at 25°C |
| Refractive Index | 1.585 |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
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 Homophthalic anhydride?
The CAS number of Homophthalic anhydride is 703-59-3.
What are the molecular formula and molecular weight of Homophthalic anhydride?
Homophthalic anhydride has molecular formula C9H6O3 and molecular weight 162.142 g/mol.
Is Homophthalic anhydride hazardous?
Homophthalic anhydride has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
What are the upstream and downstream products of Homophthalic anhydride?
For Homophthalic anhydride, Upstream Products: Homophthalic acid, 1-Indanone, Cinnamic acid; Downstream Products: 1-Oxo-1,2-dihydro-4-isoquinolinecarboxylic acid, Isoquinolin-1(2H)-one, Isoquinoline-1,3(2H,4H)-dione.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Homophthalic anhydride (CAS 703-59-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-15301-5 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.