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1H-2-Benzopyran-1-one

Also known as: Isocoumarin, iso-coumarin, 2-benzopyran-1(1H)-one, 2,1-benzopyrone, 3,4-Benzo-2-pyrone, 3,4-Dehydro-1-isochromanone, 1H-isochromen-1-one, isochromen-1-one

1H-2-Benzopyran-1-one (CAS 491-31-6) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C9H6O2 and a molecular weight of 146.14300 g/mol. Key properties include a melting point of 47℃, a boiling point of 262.1ºC at 760 mmHg, a density of 1.248 g/cm3 and a flash point of 103.5ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
491-31-6
Jingsj CID
J-1388153-3
Molecular Formula
C9H6O2
Molecular Weight
146.14300 g/mol
Category
Organic Compounds
Last updated
8/21/2026
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Physicochemical Properties

Melting Point47℃
Boiling Point262.1ºC at 760 mmHg
Density1.248 g/cm3
Flash Point103.5ºC
Exact Mass146.03700
PSA30.21000
LogP1.79300
Vapor Pressure0.0111mmHg at 25°C
Refractive Index1.594
Storage Conditions2-8℃

Frequently Asked Questions

What is the CAS number of 1H-2-Benzopyran-1-one?

The CAS number of 1H-2-Benzopyran-1-one is 491-31-6.

What are the molecular formula and molecular weight of 1H-2-Benzopyran-1-one?

1H-2-Benzopyran-1-one has molecular formula C9H6O2 and molecular weight 146.14300 g/mol.

What are the upstream and downstream products of 1H-2-Benzopyran-1-one?

For 1H-2-Benzopyran-1-one, Upstream Products: 2-Vinylbenzoic acid, 2-ethynylbenzoic acid, 1,2-Naphthoquinone; Downstream Products: Isochroman, 1-Phenylisoquinoline.

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

Last updated:

How to cite: Jingsj. "1H-2-Benzopyran-1-one (CAS 491-31-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1388153-3 (accessed 2026-11-09).

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