3-Chlorophthalic anhydride
Also known as: 1,3-Isobenzofurandione, 4-chloro-, 4-Chloro-2-benzofuran-1,3-dione, 4-Chloroisobenzofuran-1,3-dione, 3-Chlorophthalic acid anhydride, 4-Chloro-1,3-dihydro-2-benzofuran-1,3-dione, 4-Chloro-1,3-isobenzofurandione, NSC 122937, chlorphthalidone, 3-Chlorophtalic anhydride, EINECS 204-179-8, MFCD00023107
3-Chlorophthalic anhydride (CAS 117-21-5) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C8H3ClO3 and a molecular weight of 182.561 g/mol. Key properties include a melting point of 123-126 °C, a boiling point of 317.2±15.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 152.2±19.4 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 117-21-5
- Jingsj CID
- J-42957-2
- Molecular Formula
- C8H3ClO3
- Molecular Weight
- 182.561 g/mol
- Category
- Aromatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 123-126 °C |
|---|---|
| Boiling Point | 317.2±15.0 °C at 760 mmHg |
| Density | 1.6±0.1 g/cm3 |
| Flash Point | 152.2±19.4 °C |
| Exact Mass | 181.977066 |
| PSA | 43.37000 |
| LogP | 2.19 |
| Vapor Pressure | 0.0±0.7 mmHg at 25°C |
| Refractive Index | 1.627 |
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 3-Chlorophthalic anhydride?
The CAS number of 3-Chlorophthalic anhydride is 117-21-5.
What are the molecular formula and molecular weight of 3-Chlorophthalic anhydride?
3-Chlorophthalic anhydride has molecular formula C8H3ClO3 and molecular weight 182.561 g/mol.
What are the upstream and downstream products of 3-Chlorophthalic anhydride?
For 3-Chlorophthalic anhydride, Upstream Products: 3-Nitrophthalic anhydride, 3-Chlorophthalic acid, 1-Nitronaphthalene; Downstream Products: 4-Chlorophthalide, 7-Chlorophthalide, 5-Chloroisatoic anhydride.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3-Chlorophthalic anhydride (CAS 117-21-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-42957-2 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.