5-thioxo-4,5-dihydro-1,2,4-triazin-3(2H)-one

Also known as: 1,2,4-Triazin-3(2H)-one,4,5-dihydro-5-thioxo-, 5-Thioxo-3,4-dihydro-1,2,4-triazin-3(2H)-one, 5-Thioxo-4,5-dihydro-1,2,4-triazin-3(2H)-one, 5-Thioxo-4,5-dihydro-2H-[1,2,4]triazin-3-one, 5-sulfanylidene-2,3,4,5-tetrahydro-1,2,4-triazin-3-one, 5-sulfanylidene-2H-1,2,4-triazin-3-one, 6-aza-4-thiouracil, NSC 38622, F1207-0026

5-thioxo-4,5-dihydro-1,2,4-triazin-3(2H)-one (CAS 1627-37-8) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C3H3N3OS and a molecular weight of 129.14000 g/mol. Key properties include a boiling point of 431ºC at 760mmHg, a density of 1.79g/cm3 and a flash point of 214.4ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 1627-37-8
Jingsj CID: J-1518875-7
Molecular Formula: C₃H₃N₃OS
Molecular Weight: 129.14000 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	431ºC at 760mmHg
Density	1.79g/cm3
Flash Point	214.4ºC
Exact Mass	129.00000
PSA	93.63000
Vapor Pressure	4.95E-08mmHg at 25°C
Refractive Index	1.812

Customs & Trade Information

HS Code	2933699090
Summary	2933699090 other compounds containing an unfused triazine ring (whether or not hydrogenated) in the structure。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 5-thioxo-4,5-dihydro-1,2,4-triazin-3(2H)-one?

The CAS number of 5-thioxo-4,5-dihydro-1,2,4-triazin-3(2H)-one is 1627-37-8.

What are the molecular formula and molecular weight of 5-thioxo-4,5-dihydro-1,2,4-triazin-3(2H)-one?

5-thioxo-4,5-dihydro-1,2,4-triazin-3(2H)-one has molecular formula C3H3N3OS and molecular weight 129.14000 g/mol.

What are the upstream and downstream products of 5-thioxo-4,5-dihydro-1,2,4-triazin-3(2H)-one?

For 5-thioxo-4,5-dihydro-1,2,4-triazin-3(2H)-one, Upstream Products: 6-Azauracil, Lawesson's reagent; Downstream Products: 1,2,4-Triazin-3(2H)-one, 5-(methylthio)-.

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. "5-thioxo-4,5-dihydro-1,2,4-triazin-3(2H)-one (CAS 1627-37-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1518875-7 (accessed 2026-11-09).

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