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Methyl tetrahydrophthalic anhydride

甲基四氢苯酐

Also known as: 6-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione, 5-methyl-7,7a-dihydroisobenzofuran-1,3(3aH,6H)-dione, 3a,4,5,7a-tetrahydro-6-methyl-1,3-isobenzofurandione, MTHPA, Methyltetrahydrophthalic anhydride (mixture of isomers)

Methyl tetrahydrophthalic anhydride (CAS 19438-64-3) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C9H10O3 and a molecular weight of 166.174 g/mol. It is also known as 6-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione, 5-methyl-7,7a-dihydroisobenzofuran-1,3(3aH,6H)-dione and 3a,4,5,7a-tetrahydro-6-methyl-1,3-isobenzofurandione. Key properties include a boiling point of 303.0±41.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 142.9±24.8 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
19438-64-3
Jingsj CID
J-44970-4
Molecular Formula
C9H10O3
Chinese Name
甲基四氢苯酐
Molecular Weight
166.174 g/mol
Category
Aromatic Hydrocarbons
Last updated
8/21/2026

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Physicochemical Properties

Boiling Point303.0±41.0 °C at 760 mmHg
Density1.2±0.1 g/cm3
Flash Point142.9±24.8 °C

Frequently Asked Questions

What is the CAS number of Methyl tetrahydrophthalic anhydride?

The CAS number of Methyl tetrahydrophthalic anhydride is 19438-64-3.

What are the molecular formula and molecular weight of Methyl tetrahydrophthalic anhydride?

Methyl tetrahydrophthalic anhydride has molecular formula C9H10O3 and molecular weight 166.174 g/mol.

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

Last updated:

How to cite: Jingsj. "Methyl tetrahydrophthalic anhydride (CAS 19438-64-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-44970-4 (accessed 2026-10-22).

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