Demephion-S

Also known as: O,O-dimethyl S-(2-methylthioethyl) phosphorothioate, O,O-dimethyl S-[2-(methylthio)ethyl] phosphorothioate, dimethyl S-2-methylthioethyl phosphorothioate, Methyl demeton methyl, Phosphorothioic acid, O,O-dimethyl S-(2-methylthio)ethyl ester, Thiophosphoric acid O,O-dimethyl S-(2-methylthioethyl) ester, Caswell No. 369A, Cebetox, Cymetox, Isonitox, Isotinox, Demephion-S [ISO:BSI]

Demephion-S (CAS 2587-90-8) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C5H13O3PS2 and a molecular weight of 216.25900 g/mol. Key properties include a boiling point of 270.3ºC at 760mmHg, a density of 1.229g/cm3 and a flash point of 117.3ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 2587-90-8
Jingsj CID: J-1503278-7
Molecular Formula: C₅H₁₃O₃PS₂
Molecular Weight: 216.25900 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	270.3ºC at 760mmHg
Density	1.229g/cm3
Flash Point	117.3ºC
Exact Mass	216.00400
PSA	95.94000
LogP	2.48350
Vapor Pressure	0.0114mmHg at 25°C
Refractive Index	1.498

Customs & Trade Information

HS Code	2930909062
Summary	2930909062 s-((tert-butylthio)methyl) o,o-diethyl phosphorodithioate

Frequently Asked Questions

What is the CAS number of Demephion-S?

The CAS number of Demephion-S is 2587-90-8.

What are the molecular formula and molecular weight of Demephion-S?

Demephion-S has molecular formula C5H13O3PS2 and molecular weight 216.25900 g/mol.

What are the upstream and downstream products of Demephion-S?

For Demephion-S, Upstream Products: 2-Chloroethyl methyl sulfide.

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. "Demephion-S (CAS 2587-90-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1503278-7 (accessed 2026-11-09).

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