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Impurities and reference standards

Diethyl methylphosphonate

Also known as Diethyl methanephosphonate, DEMP, 1-[ethoxy(methyl)phosphoryl]oxyethane

CAS 683-08-9Formula C5H13O3PMolar mass 152.13 g/molEC 211-667-4
GHS signal word: Warning. Pictograms: Harmful or irritant 2 suppliers listed
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Diethyl methylphosphonate chemical structure, C5H13O3P, CAS 683-08-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
683-08-9
Formula
C5H13O3P
Boiling point
194 °C
Density
1.04 @ 30 °C
HS code
293149
Category
Impurities and reference standards

What is Diethyl methylphosphonate?

Plain description, key identifiers and synonyms

Diethyl methylphosphonate is a chemical substance with the molecular formula C5H13O3P and a molar mass of 152.13 g/mol. Its CAS registry number is 683-08-9. The IUPAC name is 1-[ethoxy(methyl)phosphoryl]oxyethane.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1-[ethoxy(methyl)phosphoryl]oxyethane
CAS number
683-08-9 CAS number cross-checked
EC number
211-667-4
Molecular formula
C5H13O3P
UNII
JRX9AX7374
MDL number
MFCD00009813
InChIKey
NYYLZXREFNYPKB-UHFFFAOYSA-N
InChI
InChI=1S/C5H13O3P/c1-4-7-9(3,6)8-5-2/h4-5H2,1-3H3
SMILES (canonical and isomeric)
CCOP(=O)(C)OCC

Synonyms

  • Diethyl methanephosphonate
  • DEMP
  • 1-[ethoxy(methyl)phosphoryl]oxyethane
  • Phosphonic acid, methyl-, diethyl ester
  • Diethylmethylphosphonate
  • Methylphosphonic Acid Diethyl Ester
  • Adefovir Impurity 36
  • diethyl methyphosphonate
  • Diethoxymethylphosphine oxide
  • o,o-Diethyl methylphosphonate
  • 4-04-00-03500 (Beilstein Handbook Reference)
  • Diethyl methylphosphonate, 97%
  • methanphosphonic acid diethyl ester
  • methyl-phosphonic acid diethyl ester
  • Methylphosphonic acid, diethyl ester
  • Phosphonic acid, P-methyl-, diethyl ester
  • Diethyl methylphosphonate, purum, >=97.0% (GC)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Boiling point
194 °Cexp.
Density
1.04 @ 30 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
152.13 g/molcalc.
Exact mass
152.0602 Dacalc.
LogP (octanol/water)
1.88calc.
Topological polar surface area
35.53 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
4calc.
Heavy atoms
9calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Diethyl methylphosphonate suppliers

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All 2 suppliers

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Where suppliers are based

2 suppliers in 1 country

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Diethyl methylphosphonate price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Diethyl methylphosphonate is traded under.

HS 2931.49Indicative HS code

Non-halogenated organo-phosphorous derivatives, other

World exports in 2024
$3.44B
−6.5% vs 2023, imports $3.07B
2022 to 2024
Top exporters
  1. China54.9%
  2. United States25.4%
  3. Germany5.1%
Top importers
  1. United States20.9%
  2. Argentina14.9%
  3. Brazil14.3%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Diethyl methylphosphonate is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Diethyl methylphosphonate, based on the data on this page

What is Diethyl methylphosphonate?

Diethyl methylphosphonate is a chemical substance with the molecular formula C5H13O3P and a molar mass of 152.13 g/mol. Its CAS registry number is 683-08-9. The IUPAC name is 1-[ethoxy(methyl)phosphoryl]oxyethane.

What is the CAS number of Diethyl methylphosphonate?

The CAS registry number of Diethyl methylphosphonate is 683-08-9.

What is the molecular formula and weight of Diethyl methylphosphonate?

The molecular formula of Diethyl methylphosphonate is C5H13O3P and its molar mass is 152.13 g/mol.

Is Diethyl methylphosphonate hazardous?

Diethyl methylphosphonate carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Diethyl methylphosphonate?

Diethyl methylphosphonate is usually classified under HS code 293149 (Non-halogenated organo-phosphorous derivatives, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Diethyl methylphosphonate?

CompoundList lists 2 suppliers of Diethyl methylphosphonate in United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Diethyl methylphosphonate?

Suppliers quote Diethyl methylphosphonate on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Diethyl methylphosphonate

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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