O-Ethyl methylphosphonothioate
O-Ethyl methylphosphonothioate (CAS 18005-40-8), with the chemical formula CH3P(S)(OH)OC2H5 and a molecular weight of 140.14 g/mol, is a phosphorus-containing compound. It finds application as a precursor in chemical synthesis and in fields related to catalysis and inorganic chemistry. Tech Serve Solutions supplies this chemical for laboratory and research purposes, adhering to stringent quality standards.
- IUPAC
- EMPSH,EMPTA

Chemical Synthesis Intermediate
O-Ethyl methylphosphonothioate serves as a valuable building block in organic and organophosphorus synthesis. Its reactive functional groups allow for its incorporation into more complex molecular structures.
Phosphorus Precursor
This compound acts as a precursor for the synthesis of various organophosphorus compounds. It is relevant in research exploring new phosphorus-based materials and reagents.
Catalysis and Inorganic Chemistry
Its properties make it suitable for investigations within catalysis and inorganic chemistry research. It may be employed in studies involving phosphorus-based catalytic systems.
| Molecular weight | 140.14 |
|---|---|
| Linear formula | CH3P(S)(OH)OC2H5 |
| Assay | 90% |
| Boiling point | 73 °C/1 mmHg(lit.) |
| Density | 1.18 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.487(lit.) |


Hazard statements
- H301Toxic if swallowed
- H311Toxic in contact with skin
- H314Causes severe skin burns and eye damage
- H331Toxic if inhaled
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P301IF SWALLOWED
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 107 °C / 224.6 °F |
| Transport (UN / ADR) | UN 2927 6.1/PG 2 |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T |
| Risk statements (R) | 23/24/25-34 |
| Safety statements (S) | 26-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is O-Ethyl methylphosphonothioate used for?
+
O-Ethyl methylphosphonothioate is primarily used as an intermediate in chemical synthesis, a phosphorus precursor, and in research related to catalysis and inorganic chemistry.
What is the CAS number and formula for O-Ethyl methylphosphonothioate?
+
The CAS number is 18005-40-8, and the chemical formula is CH3P(S)(OH)OC2H5.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies O-Ethyl methylphosphonothioate with an assay of 90%. This is a technical/research grade material, and TSS does not represent it as USP, BP, or EP.
How should O-Ethyl methylphosphonothioate be handled?
+
Handling requires extreme caution due to its significant hazards. It is toxic if swallowed, in contact with skin, and if inhaled, and causes severe skin burns and eye damage. Appropriate personal protective equipment, including faceshields, gloves, goggles, and a suitable respirator, must be used in a well-ventilated area. Refer to the safety data sheet for full details.
Is O-Ethyl methylphosphonothioate a controlled substance?
+
The provided data does not indicate that O-Ethyl methylphosphonothioate is a controlled substance.
How is O-Ethyl methylphosphonothioate shipped and exported?
+
O-Ethyl methylphosphonothioate is shipped and exported as UN 2927, Class 6.1, Packing Group II, signifying a toxic substance. Tech Serve Solutions handles all export documentation and compliance.
How can I request a quote or sample?
+
To request a quote or a sample, please contact our sales team through the website or by phone, providing the product name and CAS number.
▶ Related products

Benzeneruthenium(II) chloride dimer
Ru2(C6H6)2Cl4
Catalysis & Inorganic
Benzoylferrocene
C17H14FeO
Catalysis & Inorganic
Benzyldiphenylphosphine
C6H5CH2P(C6H5)2
Catalysis & Inorganic
Beryllium
Be
Catalysis & Inorganic
Beryllium oxide
BeO
Catalysis & Inorganic![Bicyclo[2.2.1]hepta-2,5-diene-rhodium(I) chloride dimer — chemical structure, CAS 12257-42-0; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F12257-42-0.png&w=3840&q=75)
Bicyclo[2.2.1]hepta-2,5-diene-rhodium(I) chloride dimer
Catalysis & Inorganic
![Bis[(10,11-η)-5-[(11bS)-dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-yl- κP4]-5H-dibenz[b,f]azepine]rhodium(I) tetrafluorobo — chemical structure, CAS 1228149-03-8; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F1228149-03-8.png&w=3840&q=75)
Bis[(10,11-η)-5-[(11bS)-dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-yl- κP4]-5H-dibenz[b,f]azepine]rhodium(I) tetrafluorobo
1-d:1′
Catalysis & Inorganic![Bis[(2-dimethylamino)phenyl]amine nickel(II) chloride (C16H20ClN3Ni) — chemical structure, CAS 1033772-47-2; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F1033772-47-2.png&w=3840&q=75)
Bis[(2-dimethylamino)phenyl]amine nickel(II) chloride
C16H20ClN3Ni
Catalysis & Inorganic▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis