1,6-Dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one

Also known as: 7-Hydroxypyrazolo[4,3-d]pyrimidine, 7H-Pyrazolo[4,3-d]pyrimidin-7-one, 1,4-Dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one, 1H-Pyrazolo[4,3-d]pyrimidin-7-ol, Nsc 79301, 7-ketopyrazolo(4,3-d)pyrimidine

1,6-Dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one (CAS 13877-55-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H4N4O and a molecular weight of 136.111 g/mol. Key properties include a boiling point of 559.8±23.0 °C at 760 mmHg, a density of 1.9±0.1 g/cm3 and a flash point of 292.3±22.6 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 13877-55-9
Jingsj CID: J-1011396-9
Molecular Formula: C₅H₄N₄O
Molecular Weight: 136.111 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	559.8±23.0 °C at 760 mmHg
Density	1.9±0.1 g/cm3
Flash Point	292.3±22.6 °C
Exact Mass	136.038513
PSA	74.69000
LogP	-1.13
Vapor Pressure	0.0±1.5 mmHg at 25°C
Refractive Index	1.903

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 1,6-Dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one?

The CAS number of 1,6-Dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one is 13877-55-9.

What are the molecular formula and molecular weight of 1,6-Dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one?

1,6-Dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one has molecular formula C5H4N4O and molecular weight 136.111 g/mol.

What are the upstream and downstream products of 1,6-Dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one?

For 1,6-Dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one, Upstream Products: 4-Amino-1H-pyrazole-5-carboxamide, Methanimidic acid, (Z)-, 4-Amino-1H-pyrazole-3-carboxylic acid; Downstream Products: 7-Chloro-1H-pyrazolo[4,3-d]pyrimidine, 4-Chloro-1H-pyrazolo[3,4-d]pyrimidine, 1H-Pyrazolo[4,3-d]pyrimidin-7-amine.

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. "1,6-Dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one (CAS 13877-55-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1011396-9 (accessed 2026-11-09).

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