Molekula
Diethyl phosphite
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Diethyl phosphite is a colorless liquid used as a reagent in organic synthesis, particularly in the preparation of phosphorus-containing compounds. It is a versatile intermediate in the synthesis of pesticides, pharmaceuticals, and flame retardants. Industrially, it also serves as an additive for extreme-pressure lubricants and adhesives, an antioxidant, a paint solvent and a textile finishing agent. CAS: 762-04-9, Molecular Formula: (C2H5O)2P(O)H, Molecular Weight: 138.10 g/mol, Storage: Ambient, Signal Word: Danger. Molekula supplies Diethyl phosphite from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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500 g — $103.20 per pack
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Colorless transparent liquid |
| Identification | Conforms to reference |
| Assay | ≥99% |
| Ethanol | ≤0.8% |
| Acidity | ≤0.1% |
| Triethyl phosphate | ≤0.5% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 74 °C |
| Transport Class | 9 |
| Packing Group | III |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Water-white liquid |
| Odour | Little odor |
| Boiling Point | 138 °C |
| Density | 1.069 g/cm³ at 25 °C |
| Water Solubility | Soluble in water |
| Solubility (other solvents) | Soluble in common organic solvents |
| Vapour Pressure | 11.2 mmHg at 25 °C |
| Refractive Index | 1.4061 |
Source: PubChem CID 6327654 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 40923677 |
| CAS Number | 762-04-9 |
| IUPAC Name | diethoxy(oxo)phosphanium |
| EC Number | 212-091-6 |
| Molecular Formula | (C2H5O)2P(O)H |
| Molecular Weight | 138.10 |
| Exact Mass | 137.0368 |
| SMILES | CCO[P+](=O)OCC |
| InChIKey | LXCYSACZTOKNNS-UHFFFAOYSA-N |
| InChI | InChI=1S/C4H10O3P/c1-3-6-8(5)7-4-2/h3-4H2,1-2H3/q+1 |
| PubChem CID | 6327654 |
| UN Number | UN3334 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2920.22.0000 |
| Tariff Code | 2920220000 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
Hazard statements
- H317 May cause an allergic skin reaction
- H318 Causes serious eye damage
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Russian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Diethoxyphosphine oxide
- Diethyl acid phosphite
- Diethyl hydrogen phosphite
- Diethyl phosphonate
- Diethylfosfit
- Ethyl phosphonate ((EtO)2HPO)
- Hydrogen diethyl phosphite
- O,O-Diethyl phosphonate
- Phosphonic acid diethyl ester
- Phosphorous acid, diethyl ester
Frequently asked questions
What is diethyl phosphite used for?
Diethyl phosphite is primarily used as a reagent in organic synthesis, particularly in the preparation of phosphorus-containing compounds and as a ligand in catalysis.
What is the chemical formula and molecular weight of diethyl phosphite?
The formula is (C2H5O)2P(O)H and the molecular weight is 138.10 g/mol.
How should diethyl phosphite be stored?
It should be stored at ambient temperature, away from moisture and incompatible materials, in a tightly sealed container.
What grade of diethyl phosphite does Molekula supply?
Molekula supplies diethyl phosphite in technical grade; custom grades are available upon request.
Can Molekula supply diethyl phosphite in bulk?
Yes, Molekula can supply diethyl phosphite in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with a purchase of diethyl phosphite?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS); additional documentation is available upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.