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Benzophenone-3,3',4,4'-tetracarboxylic dianhydride

3,3',4,4'-二苯甲酮四羧酸二酐

Also known as: 4,4'-Carbonyldiphthalic anhydride, 5,5'-Carbonylbis(isobenzofuran-1,3-dione), 3,3',4,4'-Benzophenonetetracarboxylic acid dianhydride, Benzophenonetetracarboxylic dianhydride, BTDA

Benzophenone-3,3',4,4'-tetracarboxylic dianhydride (CAS 2421-28-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C17H6O7 and a molecular weight of 322.225 g/mol. It is also known as 4,4'-Carbonyldiphthalic anhydride, 5,5'-Carbonylbis(isobenzofuran-1,3-dione) and 3,3',4,4'-Benzophenonetetracarboxylic acid dianhydride. Key properties include a melting point of 218-222 °C(lit.), a boiling point of 638.8±40.0 °C at 760 mmHg, a density of 1.7±0.1 g/cm3 and a flash point of 286.1±27.4 °C. GHS signal word: Warning. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
2421-28-5
Jingsj CID
J-27730-9
Molecular Formula
C17H6O7
Chinese Name
3,3',4,4'-二苯甲酮四羧酸二酐
Molecular Weight
322.225 g/mol
Category
Organic Acids
Last updated
8/21/2026

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Physicochemical Properties

Melting Point218-222 °C(lit.)
Boiling Point638.8±40.0 °C at 760 mmHg
Density1.7±0.1 g/cm3
Flash Point286.1±27.4 °C

GHS Safety & Compliance

IrritantSignal word: Warning

Frequently Asked Questions

What is the CAS number of Benzophenone-3,3',4,4'-tetracarboxylic dianhydride?

The CAS number of Benzophenone-3,3',4,4'-tetracarboxylic dianhydride is 2421-28-5.

What are the molecular formula and molecular weight of Benzophenone-3,3',4,4'-tetracarboxylic dianhydride?

Benzophenone-3,3',4,4'-tetracarboxylic dianhydride has molecular formula C17H6O7 and molecular weight 322.225 g/mol.

Is Benzophenone-3,3',4,4'-tetracarboxylic dianhydride hazardous?

Benzophenone-3,3',4,4'-tetracarboxylic dianhydride has GHS signal word Warning.

Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "Benzophenone-3,3',4,4'-tetracarboxylic dianhydride (CAS 2421-28-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-27730-9 (accessed 2026-10-23).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.