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Sulfur and phosphorus compounds

2-Hydroxyethanephosphonic acid

Also known as (2-Hydroxyethyl)phosphonic acid, 2-Hydroxyethylphosphonic acid, 2-hydroxyethyl phosphonic acid

CAS 22987-21-9Formula C2H7O4PMolar mass 126.05 g/molEC 245-370-6
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant
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2-Hydroxyethanephosphonic acid chemical structure, C2H7O4P, CAS 22987-21-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
22987-21-9
Formula
C2H7O4P
Molar mass
126.05 g/mol
EC number
245-370-6
HS code
293149
Category
Sulfur and phosphorus compounds

What is 2-Hydroxyethanephosphonic acid?

Plain description, key identifiers and synonyms

2-hydroxyethylphosphonic acid is a phosphonic acid consisting of ethanol with the phospho group at the 2-position. It is functionally related to a phosphonic acid. It is a conjugate acid of a 2-hydroxyethylphosphonic acid(1-).

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-hydroxyethylphosphonic acid
CAS number
22987-21-9 CAS number cross-checked
EC number
245-370-6
Molecular formula
C2H7O4P
UNII
8A26D6AUP2
MDL number
MFCD00043865
InChIKey
SEHJHHHUIGULEI-UHFFFAOYSA-N
InChI
InChI=1S/C2H7O4P/c3-1-2-7(4,5)6/h3H,1-2H2,(H2,4,5,6)
SMILES (canonical and isomeric)
C(CP(=O)(O)O)O

Synonyms

  • (2-Hydroxyethyl)phosphonic acid
  • 2-Hydroxyethylphosphonic acid
  • 2-hydroxyethyl phosphonic acid
  • 2-Hydroxyethylphosphonate
  • Phosphonic acid, (2-hydroxyethyl)-
  • Ethephon-hydroxy
  • Phosphonic acid, P-(2-hydroxyethyl)-
  • P-(2-Hydroxyethyl)-phosphonic Acid
  • Ethephon metabolite
  • Phosphonic acid,P-(2-hydroxyethyl)-
  • (2-Hydroxyethyl)phosphonicacid
  • (2-hydroxyethyl)-phosphonicaci
  • (2-Hydroxyethyl)-phosphonic acid
  • P-(2-Hydroxyethyl)phosphonic acid
  • 2-Hydroxyethyl phosphonic acid, 97 %
  • Ethephon-hydroxy 100 |Ig/mL in Acetonitrile
  • Ethephon-hydroxy 100 microg/mL in Acetonitrile
  • 2-Hydroxyethanephosphonic Acid Solution in Water, 100ug/mL
  • 2-Hydroxyethanephosphonic Acid Solution in Water, 1000ug/mL
  • Ethephon-hydroxy, P-(2-Hydroxyethyl)-phosphonic Acid, (2-Hydroxyethyl)phosphonic Acid

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
126.05 g/molcalc.
Exact mass
126.0082 Dacalc.
LogP (octanol/water)
-0.84calc.
Topological polar surface area
77.76 Ųcalc.
Hydrogen bond donors
3calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
2calc.
Heavy atoms
7calc.
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
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H302Harmful if swallowed.
  • H314Causes severe skin burns and eye damage.
  • H318Causes serious eye damage.
Precautionary statements (17)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P363Wash contaminated clothing before reuse.
  • 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

2-Hydroxyethanephosphonic acid suppliers

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2-Hydroxyethanephosphonic acid 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

Use classes: Pesticide transformation products.

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 2-Hydroxyethanephosphonic acid 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 2-Hydroxyethanephosphonic acid is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 2-Hydroxyethanephosphonic acid, based on the data on this page

What is 2-Hydroxyethanephosphonic acid?

2-hydroxyethylphosphonic acid is a phosphonic acid consisting of ethanol with the phospho group at the 2-position. It is functionally related to a phosphonic acid. It is a conjugate acid of a 2-hydroxyethylphosphonic acid(1-).

What is the CAS number of 2-Hydroxyethanephosphonic acid?

The CAS registry number of 2-Hydroxyethanephosphonic acid is 22987-21-9.

What is the molecular formula and weight of 2-Hydroxyethanephosphonic acid?

The molecular formula of 2-Hydroxyethanephosphonic acid is C2H7O4P and its molar mass is 126.05 g/mol.

What is 2-Hydroxyethanephosphonic acid used for?

Use classes: Pesticide transformation products.

Is 2-Hydroxyethanephosphonic acid hazardous?

2-Hydroxyethanephosphonic acid carries the GHS signal word "Danger". Main hazards: harmful if swallowed, causes severe skin burns and eye damage, causes serious eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 2-Hydroxyethanephosphonic acid?

2-Hydroxyethanephosphonic acid 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 2-Hydroxyethanephosphonic acid?

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What is the price of 2-Hydroxyethanephosphonic acid?

Suppliers quote 2-Hydroxyethanephosphonic acid 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 2-Hydroxyethanephosphonic acid

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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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