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Carboxylic acids and anhydrides

Ethyl chlorothioformate

Also known as Ethyl chlorothiolformate, S-Ethyl chlorothioformate, Carbonochloridothioic acid, S-ethyl ester

CAS 2941-64-2Formula C3H5ClOSMolar mass 124.59 g/molEC 220-928-1
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Acute toxicity (severe), Harmful or irritant 1 supplier listed
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Ethyl chlorothioformate chemical structure, C3H5ClOS, CAS 2941-64-2
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Liquid
Boiling point
132.2 °C
Density
1.195 - Denser than water, will sink
Flash point
30.6 °C
Solubility
Less than 1 mg/mL at 66 °F
HS code
293090
Category
Carboxylic acids and anhydrides
UN number
UN 2826
Illustrative photo, closed blue jerry cans in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Ethyl chlorothioformate?

Plain description, key identifiers and synonyms

Ethyl chlorothioformate appears as an amber-colored liquid with a pungent penetrating odor. Very toxic by inhalation. Corrosive to metals and tissue. Denser than water. Vapors heavier than air.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
S-ethyl chloromethanethioate
CAS number
2941-64-2 CAS number cross-checkedOther or deprecated CAS: 2812-73-9
EC number
220-928-1
Molecular formula
C3H5ClOS
UNII
8B294Z76EO
InChIKey
QCMHWZUFWLOOGI-UHFFFAOYSA-N
InChI
InChI=1S/C3H5ClOS/c1-2-6-3(4)5/h2H2,1H3
SMILES (canonical and isomeric)
CCSC(=O)Cl

Synonyms

  • Ethyl chlorothiolformate
  • S-Ethyl chlorothioformate
  • Carbonochloridothioic acid, S-ethyl ester
  • Ethyl thiochloroformate
  • S-Ethyl chlorothiocarbonate
  • S-Ethyl carbonochloridothioate
  • Ethylthiol chloroformate
  • Ethylthiocarbonyl chloride
  • S-Ethyl thiochloroformate
  • S-(Ethyl)chlorothioformic acid
  • S-Ethyl chlorothiolformate
  • Thioethoxycarnonyl chloride
  • Formic acid, chlorothio-, S-ethyl ester
  • Thioethoxycarbonyl chloride
  • Ethyl chlorothioloformate
  • SEthyl chlorothioformate
  • SEthyl thiochloroformate
  • SEthyl chlorothiocarbonate
  • SEthyl carbonochloridothioate
  • Ethyl (chlorosulfenyl)formate
  • S(Ethyl)chlorothioformic acid
  • Formic acid, chlorothio-, S-ethyl ester (7CI,8CI)
  • Ethyl (chlorothio)formate
  • Formic acid, chlorothio, Sethyl ester
  • Carbonochloridothioic acid, Sethyl ester
Show all 37 synonyms
  • Chlorothioformic acid ethyl ester
  • Thiohypochlorous acid, anhydrosulfide with o-ethyl thiocarbonate
  • Carbonic acid, thio-, anhydrosulfide with thiohypochlorous acid, ethyl ester
  • Ethoxycarbonylsulfenyl chloride
  • S-ethyl chloromethanethioate
  • S-Ethyl chlorothioformic acid
  • chlorothioformic acid S-ethyl ester
  • Ethyl thiolchloroformate
  • S-Ethyl chlorothiol formate
  • S-Ethyl chloridothiocarbonate #
  • S-Ethyl chlorothioformate, 96%
  • Ethyl chlorothioformate [UN2826] [Corrosive]

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

Physical form
Liquidexp.
Boiling point
132.2 °Cexp.
Density
1.195 - Denser than water, will sinkexp.
Flash point
30.6 °Cexp.
Solubility
Less than 1 mg/mL at 66 °Fexp.
Vapour pressure
111 mmHg at 77 °Fexp.

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
124.59 g/molcalc.
Exact mass
123.975 Dacalc.
LogP (octanol/water)
2.1calc.
Topological polar surface area
17.07 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
1calc.
Heavy atoms
6calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.67calc.
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
GHS02: Flammable
Flammable
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H226Flammable liquid and vapour.
  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H314Causes severe skin burns and eye damage.
  • H330Fatal if inhaled.
  • H335May cause respiratory irritation.
Precautionary statements (33)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P317If swallowed: Get medical help.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P352If on skin: Wash with plenty of water.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • 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.
  • P319Get medical help if you feel unwell.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P363Wash contaminated clothing before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2826
Transport hazard class
8
Packing group
II

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

Ethyl chlorothioformate suppliers

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Ethyl chlorothioformate price

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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

United States

  • TSCA inventory (USA)
    Status: Active in US commerce, Regulatory flags: Section 4 test rule or order

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Ethyl chlorothioformate 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 Ethyl chlorothioformate is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Ethyl chlorothioformate, based on the data on this page

What is Ethyl chlorothioformate?

Ethyl chlorothioformate appears as an amber-colored liquid with a pungent penetrating odor. Very toxic by inhalation. Corrosive to metals and tissue. Denser than water. Vapors heavier than air.

What is the CAS number of Ethyl chlorothioformate?

The CAS registry number of Ethyl chlorothioformate is 2941-64-2. Other or deprecated CAS numbers: 2812-73-9.

What is the molecular formula and weight of Ethyl chlorothioformate?

The molecular formula of Ethyl chlorothioformate is C3H5ClOS and its molar mass is 124.59 g/mol.

What is Ethyl chlorothioformate used for?

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

Is Ethyl chlorothioformate hazardous?

Ethyl chlorothioformate carries the GHS signal word "Danger". Main hazards: flammable liquid and vapour, harmful if swallowed, harmful in contact with skin. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Ethyl chlorothioformate?

Ethyl chlorothioformate 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 Ethyl chlorothioformate?

CompoundList lists 1 supplier of Ethyl chlorothioformate 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 Ethyl chlorothioformate?

Suppliers quote Ethyl chlorothioformate 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 Ethyl chlorothioformate

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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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