1,2,3,9-Tetrahydro-4H-carbazol-4-one

Also known as: 1,2,3,4-Tetrahydro-4-oxo-carbazole, 1,2,3,4-Tetrahydro-4-oxocarbazole, 1,2,3,4-Tetrahydrocarbazol-4-one, 1,2,3,9-Tetrahydro-4(H)-carbazol-4-one, 4-Oxo-1,2,3,4-tetrahydrocarbazole, 2,3,4,9-Tetrahydro-1H-carbazol-4-one, Ondansetron Impurity 1, Ondansetron Impurity 10, MFCD00173749

1,2,3,9-Tetrahydro-4H-carbazol-4-one (CAS 15128-52-6) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C12H11NO and a molecular weight of 185.222 g/mol. Key properties include a melting point of 224-226ºC, a boiling point of 386.3±11.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 194.5±26.7 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 15128-52-6
Jingsj CID: J-1001805-0
Molecular Formula: C₁₂H₁₁NO
Molecular Weight: 185.222 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	224-226ºC
Boiling Point	386.3±11.0 °C at 760 mmHg
Density	1.3±0.1 g/cm3
Flash Point	194.5±26.7 °C
Exact Mass	185.084061
PSA	32.86000
LogP	3.01
Vapor Pressure	0.0±0.9 mmHg at 25°C
Refractive Index	1.689
Storage Conditions	Refrigerator

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 1,2,3,9-Tetrahydro-4H-carbazol-4-one?

The CAS number of 1,2,3,9-Tetrahydro-4H-carbazol-4-one is 15128-52-6.

What are the molecular formula and molecular weight of 1,2,3,9-Tetrahydro-4H-carbazol-4-one?

1,2,3,9-Tetrahydro-4H-carbazol-4-one has molecular formula C12H11NO and molecular weight 185.222 g/mol.

What are the upstream and downstream products of 1,2,3,9-Tetrahydro-4H-carbazol-4-one?

For 1,2,3,9-Tetrahydro-4H-carbazol-4-one, Upstream Products: 3-Anilino-2-cyclohexen-1-one, 1,3-Cyclohexanedione, Phenylhydrazine; Downstream Products: 1,2,3,4-Tetrahydro-9-methylcarbazol-4-one, 1,2,3,4-Tetrahydrocarbazole, 9H-Carbazol-4-ol.

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. "1,2,3,9-Tetrahydro-4H-carbazol-4-one (CAS 15128-52-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1001805-0 (accessed 2026-11-09).

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