3,4-Dihydro-2H-pyrido[1,2-a]pyrimidin-2-one

Also known as: 2H-Pyrido[1,2-a]pyrimidin-2-one, 3,4-dihydro-, 2H-Pyrido[1,2-a]pyrimidin-2-one,3,4-dihydro-, 3,4-DIHYDRO-2H-PYRIDO[1,2-A]PYRIMIDIN-2-ONE, 3,4-Dihydro-2H-pyrido[1,2-a]pyrimidin-2-one, 3,4-dihydropyrido[1,2-a]pyrimidin-2-one, ACID CAPTOR H, Dihydropyridopyrimidinone, EINECS 226-618-2, LABOTEST-BB LT00847264, MFCD00042798

3,4-Dihydro-2H-pyrido[1,2-a]pyrimidin-2-one (CAS 5439-14-5) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C8H8N2O and a molecular weight of 148.162 g/mol. Key properties include a melting point of 185-187ºC, a boiling point of 271.3±23.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 117.9±22.6 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 5439-14-5
Jingsj CID: J-29885-1
Molecular Formula: C₈H₈N₂O
Molecular Weight: 148.162 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	185-187ºC
Boiling Point	271.3±23.0 °C at 760 mmHg
Density	1.3±0.1 g/cm3
Flash Point	117.9±22.6 °C
Exact Mass	148.063660
PSA	34.36000
LogP	-1.34
Vapor Pressure	0.0±0.6 mmHg at 25°C
Refractive Index	1.641

Customs & Trade Information

HS Code	2933990090
Summary	2933990090. heterocyclic compounds with nitrogen 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 3,4-Dihydro-2H-pyrido[1,2-a]pyrimidin-2-one?

The CAS number of 3,4-Dihydro-2H-pyrido[1,2-a]pyrimidin-2-one is 5439-14-5.

What are the molecular formula and molecular weight of 3,4-Dihydro-2H-pyrido[1,2-a]pyrimidin-2-one?

3,4-Dihydro-2H-pyrido[1,2-a]pyrimidin-2-one has molecular formula C8H8N2O and molecular weight 148.162 g/mol.

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. "3,4-Dihydro-2H-pyrido[1,2-a]pyrimidin-2-one (CAS 5439-14-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-29885-1 (accessed 2026-11-09).

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