6-bromo-3,4-dihydro-2H-1-benzopyran-2-one

Also known as: 6-bromochroman-2-one, 6-bromo-2-chromanone, 6-bromo-3,4-dihydrochromen-2-one, 6-bromo-3,4-dihydrocoumarin, 2-oxo-6-bromo-chroman, 6-bromo-chroman-2-one

6-bromo-3,4-dihydro-2H-1-benzopyran-2-one (CAS 20921-00-0) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C9H7BrO2 and a molecular weight of 227.055 g/mol. Key properties include a boiling point of 329.5±31.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 153.1±24.8 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 20921-00-0
Jingsj CID: J-1117068-6
Molecular Formula: C₉H₇BrO₂
Molecular Weight: 227.055 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	329.5±31.0 °C at 760 mmHg
Density	1.6±0.1 g/cm3
Flash Point	153.1±24.8 °C
Exact Mass	225.962936
PSA	26.30000
LogP	2.81
Vapor Pressure	0.0±0.7 mmHg at 25°C
Refractive Index	1.599

Customs & Trade Information

HS Code	2932209090
Summary	2932209090. other lactones. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 6-bromo-3,4-dihydro-2H-1-benzopyran-2-one?

The CAS number of 6-bromo-3,4-dihydro-2H-1-benzopyran-2-one is 20921-00-0.

What are the molecular formula and molecular weight of 6-bromo-3,4-dihydro-2H-1-benzopyran-2-one?

6-bromo-3,4-dihydro-2H-1-benzopyran-2-one has molecular formula C9H7BrO2 and molecular weight 227.055 g/mol.

What are the upstream and downstream products of 6-bromo-3,4-dihydro-2H-1-benzopyran-2-one?

For 6-bromo-3,4-dihydro-2H-1-benzopyran-2-one, Upstream Products: 3-(2-Methoxyphenyl)propanoic acid, 4-bromo-2-(chloromethyl)-1-methoxybenzene, 3-(2-Hydroxyphenyl)propionic acid; Downstream Products: 6-Bromochroman, Benzenepropanal,5-bromo-2-methoxy-, 6-Bromo-2H-chromen-2-one.

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

Last updated: 8/21/2026

How to cite: Jingsj. "6-bromo-3,4-dihydro-2H-1-benzopyran-2-one (CAS 20921-00-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1117068-6 (accessed 2026-11-09).

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