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Aromatic building blocks

Etaphos

Also known as Etafos, Prothiofos-oxon, Tokuthion oxon

CAS 38527-91-2Formula C11H15Cl2O3PSMolar mass 329.19 g/mol
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Etaphos chemical structure, C11H15Cl2O3PS, CAS 38527-91-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
38527-91-2
Formula
C11H15Cl2O3PS
Molar mass
329.19 g/mol
HS code
293090
Category
Aromatic building blocks

What is Etaphos?

Plain description, key identifiers and synonyms

Etaphos is a chemical substance with the molecular formula C11H15Cl2O3PS and a molar mass of 329.19 g/mol. Its CAS registry number is 38527-91-2. The IUPAC name is 2,4-dichloro-1-[ethoxy(propylsulfanyl)phosphoryl]oxybenzene.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2,4-dichloro-1-[ethoxy(propylsulfanyl)phosphoryl]oxybenzene
CAS number
38527-91-2 CAS number cross-checked
Molecular formula
C11H15Cl2O3PS
UNII
HO5I750I7T
InChIKey
ZGPVUVBRTCPAPZ-UHFFFAOYSA-N
InChI
InChI=1S/C11H15Cl2O3PS/c1-3-7-18-17(14,15-4-2)16-11-6-5-9(12)8-10(11)13/h5-6,8H,3-4,7H2,1-2H3
SMILES (canonical and isomeric)
CCCSP(=O)(OCC)OC1=C(C=C(C=C1)Cl)Cl

Synonyms

  • Etafos
  • Prothiofos-oxon
  • Tokuthion oxon
  • O-(2,4-Dichlorophenyl) O-ethyl S-propyl phosphorothioate
  • Phosphorothioic acid, O-(2,4-dichlorophenyl) O-ethyl S-propyl ester
  • (rs)-(O-2,4-Dichlorophenyl o-ethyl S-propyl phosphorothioate)
  • Phosphorothioic acid, 2-(2,4-dichlorophenyl)o-ethyl S-propyl ester
  • 2,4-dichloro-1-[ethoxy(propylsulfanyl)phosphoryl]oxybenzene
  • Ethaphos
  • Prothiofosoxon
  • Prothiophos-Oxon
  • O-ethyl-S-propyl-2,4-dichlorophenylphosphorothioate

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
329.19 g/molcalc.
Exact mass
327.9857 Dacalc.
LogP (octanol/water)
5.66calc.
Topological polar surface area
35.53 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
7calc.
Heavy atoms
18calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.46calc.
Formal charge
0calc.
Stereocentres
1calc.
Lipinski rule of five
Passes (1 violation)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

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

Etaphos suppliers

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Etaphos 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

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 Etaphos is traded under.

HS 2930.90Indicative HS code

Organo-sulphur compounds, other

World exports in 2024
$5.83B
+0.1% vs 2023, imports $5.93B
2019 to 2024
Top exporters
  1. China40.7%
  2. United States10.9%
  3. Japan9.3%
Top importers
  1. United States13.3%
  2. Brazil12.6%
  3. China6.6%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Etaphos, based on the data on this page

What is Etaphos?

Etaphos is a chemical substance with the molecular formula C11H15Cl2O3PS and a molar mass of 329.19 g/mol. Its CAS registry number is 38527-91-2. The IUPAC name is 2,4-dichloro-1-[ethoxy(propylsulfanyl)phosphoryl]oxybenzene.

What is the CAS number of Etaphos?

The CAS registry number of Etaphos is 38527-91-2.

What is the molecular formula and weight of Etaphos?

The molecular formula of Etaphos is C11H15Cl2O3PS and its molar mass is 329.19 g/mol.

What is Etaphos used for?

Known uses and roles of Etaphos include building blocks in research and laboratory.

Is Etaphos hazardous?

No GHS hazard classification for Etaphos is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Etaphos?

Etaphos is usually classified under HS code 293090 (Organo-sulphur compounds, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Etaphos?

Post a free request on CompoundList and suppliers of Etaphos will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Etaphos?

Suppliers quote Etaphos 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 Etaphos

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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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