1,5,6,7-Tetrahydro-4-hydroxy-2H-cyclopenta[b]pyridin-2-one

Also known as: 4-Hydroxy-6,7-dihydro-1H-cyclopenta[b]pyridin-2(5H)-one, 2,4-Dihydroxy-6,7-dihydro-5H-cyclopenta[b]pyridine, 6,7-Dihydro-5H-cyclopenta[b]pyridine-2,4-diol, 2H-Cyclopenta[b]pyridin-2-one, 1,5,6,7-tetrahydro-4-hydroxy-

1,5,6,7-Tetrahydro-4-hydroxy-2H-cyclopenta[b]pyridin-2-one (CAS 55618-81-0) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C8H9NO2 and a molecular weight of 151.163 g/mol. Key properties include a boiling point of 389.9±42.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 189.6±27.9 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 55618-81-0
Jingsj CID: J-870241-8
Molecular Formula: C₈H₉NO₂
Molecular Weight: 151.163 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	389.9±42.0 °C at 760 mmHg
Density	1.3±0.1 g/cm3
Flash Point	189.6±27.9 °C
Exact Mass	151.063324
PSA	53.35000
LogP	0.24
Vapor Pressure	0.0±2.0 mmHg at 25°C
Refractive Index	1.620

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 1,5,6,7-Tetrahydro-4-hydroxy-2H-cyclopenta[b]pyridin-2-one?

The CAS number of 1,5,6,7-Tetrahydro-4-hydroxy-2H-cyclopenta[b]pyridin-2-one is 55618-81-0.

What are the molecular formula and molecular weight of 1,5,6,7-Tetrahydro-4-hydroxy-2H-cyclopenta[b]pyridin-2-one?

1,5,6,7-Tetrahydro-4-hydroxy-2H-cyclopenta[b]pyridin-2-one has molecular formula C8H9NO2 and molecular weight 151.163 g/mol.

What are the upstream and downstream products of 1,5,6,7-Tetrahydro-4-hydroxy-2H-cyclopenta[b]pyridin-2-one?

For 1,5,6,7-Tetrahydro-4-hydroxy-2H-cyclopenta[b]pyridin-2-one, Upstream Products: Diphenyl Malonate, 2H-Cyclopenta[b]pyridin-2-one, 4-amino-1,5,6,7-tetrahydro- (9CI), Ethyl 2-amino-1-cyclopentene-1-carboxylate; Downstream Products: Cyclopenta[b]pyridine.

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. "1,5,6,7-Tetrahydro-4-hydroxy-2H-cyclopenta[b]pyridin-2-one (CAS 55618-81-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-870241-8 (accessed 2026-11-09).

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