o-Phthalaldehyde
Also known as: 1,2-Benzenedicarboxaldehyde, Phthalaldehyde, OPA, o-Phthaldialdehyde, 1,2-Phthalic dicarboxaldehyde, Benzene-1,2-dicarboxaldehyde, 1,2-Benzenedialdehyde, o-Phthalic dicarboxaldehyde, Phthaldialdehyde
o-Phthalaldehyde (CAS 643-79-8) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C8H6O2 and a molecular weight of 134.132 g/mol. Key properties include a melting point of 55-58 °C(lit.), a boiling point of 266.1±23.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 98.5±19.6 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H314 — Causes severe skin burns and eye damage and H317 — May cause an allergic skin reaction. It is listed by 1 supplier; request a quote for pricing. Record last updated Aug 21, 2026.
- CAS No.
- 643-79-8
- Jingsj CID
- J-48893-2
- Molecular Formula
- C8H6O2
- Molecular Weight
- 134.132 g/mol
- Category
- Aromatic Hydrocarbons
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
Made to Order | - | - | CN China |
Physicochemical Properties
| Melting Point | 55-58 °C(lit.) |
|---|---|
| Boiling Point | 266.1±23.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 98.5±19.6 °C |
| Exact Mass | 134.036774 |
| PSA | 34.14000 |
| LogP | 0.51 |
| Vapor Pressure | 0.0±0.5 mmHg at 25°C |
| Refractive Index | 1.623 |
| Additional Property | soluble |
GHS Safety & Compliance
- H301 — Toxic if swallowed
- H314 — Causes severe skin burns and eye damage
- H317 — May cause an allergic skin reaction
- H400 — Very toxic to aquatic life
Customs & Trade Information
| HS Code | 2912299000 |
|---|---|
| Summary | 2912299000. other cyclic aldehydes without other oxygen function. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:5.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of o-Phthalaldehyde?
The CAS number of o-Phthalaldehyde is 643-79-8.
What are the molecular formula and molecular weight of o-Phthalaldehyde?
o-Phthalaldehyde has molecular formula C8H6O2 and molecular weight 134.132 g/mol.
Which suppliers offer o-Phthalaldehyde?
1 supplier(s) listed; request a quote for pricing.
Is o-Phthalaldehyde hazardous?
o-Phthalaldehyde has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H314 — Causes severe skin burns and eye damage; H317 — May cause an allergic skin reaction.
What are the upstream and downstream products of o-Phthalaldehyde?
For o-Phthalaldehyde, Upstream Products: Naphthalene, Phthalan, 1,2-Benzenedimethanol; Downstream Products: 2,3-Dihydro-2-phenyl-1H-isoindol-1-one, Phthalan, 2-(1-oxoisoindolin-2-yl)benzoic 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. "o-Phthalaldehyde (CAS 643-79-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-48893-2 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.