Pyrazolo[1,5-a]pyrimidin-7(4H)-one

Also known as: 4H-Pyrazolo[1,5-a]pyrimidin-7-one, 4,7-dihydropyrazolo[1,5-a]pyrimidin-7-one, 4H,7H-pyrazolo[1,5-a]pyrimidin-7-one

Pyrazolo[1,5-a]pyrimidin-7(4H)-one (CAS 29274-23-5) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C6H5N3O and a molecular weight of 135.12300 g/mol. Key properties include a boiling point of 297.644ºC at 760 mmHg, a density of 1.511g/cm3 and a flash point of 133.811ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 29274-23-5
Jingsj CID: J-1499668-0
Molecular Formula: C₆H₅N₃O
Molecular Weight: 135.12300 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	297.644ºC at 760 mmHg
Density	1.511g/cm3
Flash Point	133.811ºC
Exact Mass	135.04300
PSA	50.42000
LogP	0.43490
Vapor Pressure	0.001mmHg at 25°C
Refractive Index	1.739

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 Pyrazolo[1,5-a]pyrimidin-7(4H)-one?

The CAS number of Pyrazolo[1,5-a]pyrimidin-7(4H)-one is 29274-23-5.

What are the molecular formula and molecular weight of Pyrazolo[1,5-a]pyrimidin-7(4H)-one?

Pyrazolo[1,5-a]pyrimidin-7(4H)-one has molecular formula C6H5N3O and molecular weight 135.12300 g/mol.

What are the upstream and downstream products of Pyrazolo[1,5-a]pyrimidin-7(4H)-one?

For Pyrazolo[1,5-a]pyrimidin-7(4H)-one, Upstream Products: 1,3-Dimethyluracil, 3-Aminopyrazole, Ethyl formate; Downstream Products: 7-Chloropyrazolo[1,5-a]pyrimidine.

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. "Pyrazolo[1,5-a]pyrimidin-7(4H)-one (CAS 29274-23-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1499668-0 (accessed 2026-11-09).

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