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1,2,3,6-Tetrahydrophthalic anhydride

Also known as: Cis-1,2,3,6-Tetrahydrophthalic anhydride, Tetrahydrophthalic anhydride, 3a,4,7,7a-Tetrahydroisobenzofuran-1,3-dione, cis-4-Cyclohexene-1,2-dicarboxylic anhydride, THPA, 1,3-Isobenzofurandione, 3a,4,7,7a-tetrahydro-, MFCD00005916

1,2,3,6-Tetrahydrophthalic anhydride (CAS 85-43-8) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C8H8O3 and a molecular weight of 152.147 g/mol. Key properties include a melting point of 101-102°C, a boiling point of 305.6±42.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 148.3±25.1 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
85-43-8
Jingsj CID
J-1990977-4
Molecular Formula
C8H8O3
Molecular Weight
152.147 g/mol
Category
Organic Acids
Last updated
8/21/2026
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Physicochemical Properties

Melting Point101-102°C
Boiling Point305.6±42.0 °C at 760 mmHg
Density1.3±0.1 g/cm3
Flash Point148.3±25.1 °C
Exact Mass152.047348
PSA43.37000
LogP0.10
Vapor Pressure0.0±0.6 mmHg at 25°C
Refractive Index1.529

Frequently Asked Questions

What is the CAS number of 1,2,3,6-Tetrahydrophthalic anhydride?

The CAS number of 1,2,3,6-Tetrahydrophthalic anhydride is 85-43-8.

What are the molecular formula and molecular weight of 1,2,3,6-Tetrahydrophthalic anhydride?

1,2,3,6-Tetrahydrophthalic anhydride has molecular formula C8H8O3 and molecular weight 152.147 g/mol.

What are the upstream and downstream products of 1,2,3,6-Tetrahydrophthalic anhydride?

For 1,2,3,6-Tetrahydrophthalic anhydride, Upstream Products: o-xylene, Maleic anhydride, butadiene; Downstream Products: N-Ethylphthalimide, Phthalic anhydride, 3,4,5,6-Tetrahydrophthalic 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. "1,2,3,6-Tetrahydrophthalic anhydride (CAS 85-43-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1990977-4 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.