5,6-Dihydro-2H-pyran-2-one

Also known as: 5,6-Dihydro-2-pyranone, 2,3-Dihydropyran-6-one, 2-Pentenoic acid, 5-hydroxy-, delta-lactone, 2H-Pyran-2-one, 5,6-dihydro-, Dihydropyranone

5,6-Dihydro-2H-pyran-2-one (CAS 3393-45-1) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C5H6O2 and a molecular weight of 98.100 g/mol. Key properties include a boiling point of 233.7±19.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 46.1±0.0 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 3393-45-1
Jingsj CID: J-36430-7
Molecular Formula: C₅H₆O₂
Molecular Weight: 98.100 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	233.7±19.0 °C at 760 mmHg
Density	1.1±0.1 g/cm3
Flash Point	46.1±0.0 °C
Exact Mass	98.036781
PSA	26.30000
LogP	-0.08
Vapor Pressure	0.1±0.5 mmHg at 25°C
Refractive Index	1.471

Customs & Trade Information

HS Code	2932999099
Summary	2932999099. other heterocyclic compounds with oxygen hetero-atom(s) only. 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 5,6-Dihydro-2H-pyran-2-one?

The CAS number of 5,6-Dihydro-2H-pyran-2-one is 3393-45-1.

What are the molecular formula and molecular weight of 5,6-Dihydro-2H-pyran-2-one?

5,6-Dihydro-2H-pyran-2-one has molecular formula C5H6O2 and molecular weight 98.100 g/mol.

What are the upstream and downstream products of 5,6-Dihydro-2H-pyran-2-one?

For 5,6-Dihydro-2H-pyran-2-one, Upstream Products: 3,6-dihydro-2H-pyran, 3,4-dihydro-6-(trimethylsilyloxy)-2H-pyran, 3,4-Dihydro-2H-pyran; Downstream Products: delta-Valerolactone, alpha-pyrone, 5-Bromo-2H-pyran-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. "5,6-Dihydro-2H-pyran-2-one (CAS 3393-45-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-36430-7 (accessed 2026-11-09).

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