1,3-Cyclopentanedione

Also known as: cyclopentane-1,3-dione, 1,3-dioxocyclopentane, NSC 364015, MFCD00001405, EINECS 223-372-8

1,3-Cyclopentanedione (CAS 3859-41-4) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C5H6O2 and a molecular weight of 98.10 g/mol. Key properties include a melting point of 149-151 °C(lit.), a boiling point of 221.8±23.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 80.1±19.6 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 3859-41-4
Jingsj CID: J-45827-5
Molecular Formula: C₅H₆O₂
Molecular Weight: 98.10 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	149-151 °C(lit.)
Boiling Point	221.8±23.0 °C at 760 mmHg
Density	1.2±0.1 g/cm3
Flash Point	80.1±19.6 °C
Exact Mass	98.036781
PSA	34.14000
LogP	-1.27
Vapor Pressure	0.1±0.4 mmHg at 25°C
Refractive Index	1.483

Customs & Trade Information

HS Code	2914299000
Summary	2914299000. other cyclanic, cyclenic or cyclotherpenic ketones without other oxygen function. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:5.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 1,3-Cyclopentanedione?

The CAS number of 1,3-Cyclopentanedione is 3859-41-4.

What are the molecular formula and molecular weight of 1,3-Cyclopentanedione?

1,3-Cyclopentanedione has molecular formula C5H6O2 and molecular weight 98.10 g/mol.

What are the upstream and downstream products of 1,3-Cyclopentanedione?

For 1,3-Cyclopentanedione, Upstream Products: morpholine, 3-Hydroxybenzaldehyde, 4-Cyclopentene-1,3-dione; Downstream Products: methyl 4-methoxy-2-oxocyclopent-3-ene-1-carboxylate, 2-Chloro-1,3-cyclopentanedione, 2-bromo-3-methoxycyclopent-2-enone.

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. "1,3-Cyclopentanedione (CAS 3859-41-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-45827-5 (accessed 2026-11-09).

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