4-Ethynylphthalic anhydride
4-乙炔基邻苯二甲酸酐
Also known as: 5-Ethynyl-2-benzofuran-1,3-dione, 1,3-Isobenzofurandione, 5-ethynyl-, 5-Ethynylisobenzofuran-1,3-dione, 5-Ethynyl-phthalic anhydride, CKK 1, FF Monomer 301
4-Ethynylphthalic anhydride (CAS 73819-76-8) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C10H4O3 and a molecular weight of 172.137 g/mol. It is also known as 5-Ethynyl-2-benzofuran-1,3-dione, 1,3-Isobenzofurandione, 5-ethynyl- and 5-Ethynylisobenzofuran-1,3-dione. Key properties include a melting point of 125ºC, a boiling point of 352.5±25.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 175.6±20.4 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 73819-76-8
- Jingsj CID
- J-1173520-9
- Molecular Formula
- C10H4O3
- Chinese Name
- 4-乙炔基邻苯二甲酸酐
- Molecular Weight
- 172.137 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 125ºC |
|---|---|
| Boiling Point | 352.5±25.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 175.6±20.4 °C |
Frequently Asked Questions
What is the CAS number of 4-Ethynylphthalic anhydride?
The CAS number of 4-Ethynylphthalic anhydride is 73819-76-8.
What are the molecular formula and molecular weight of 4-Ethynylphthalic anhydride?
4-Ethynylphthalic anhydride has molecular formula C10H4O3 and molecular weight 172.137 g/mol.
Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "4-Ethynylphthalic anhydride (CAS 73819-76-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1173520-9 (accessed 2026-10-25).
Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.