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Heterocyclic compounds

Thiirane

Also known as Ethylene sulfide, Thiacyclopropane, Ethylene sulphide

CAS 420-12-2Formula C2H4SMolar mass 60.12 g/molEC 206-993-9
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Acute toxicity (severe) 1 supplier listed
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Thiirane chemical structure, C2H4S, CAS 420-12-2
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless liquid
Melting point
-109 °C
Boiling point
57 °C
Density
1.0130 g/cm³ at 20 °C
Solubility
Slightly soluble in ethanol and ether, soluble in acetone and chloroform
HS code
293499
Category
Heterocyclic compounds
Illustrative photo, 200 litre blue HDPE drums of liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Thiirane?

Plain description, key identifiers and synonyms

Thiirane is a saturated organic heteromonocyclic parent and an organosulfur heterocyclic compound.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
thiirane
CAS number
420-12-2 CAS number cross-checked
EC number
206-993-9
Molecular formula
C2H4S
UNII
A2W5165740
MDL number
MFCD00005159
InChIKey
VOVUARRWDCVURC-UHFFFAOYSA-N
InChI
InChI=1S/C2H4S/c1-2-3-1/h1-2H2
SMILES (canonical and isomeric)
C1CS1

Synonyms

  • Ethylene sulfide
  • Thiacyclopropane
  • Ethylene sulphide
  • 2,3-Dihydrothiirene
  • Sulfurane
  • Thiiran
  • Ethylene episulfide
  • Ethylene episulphide
  • Aethylensulfid
  • Thiirene, 2,3-dihydro-
  • Epithioethane
  • Dimethylene sulfide
  • Ethylene sulfide (stabilised with Butyl mercaptan)
  • ethylenesulfide
  • Ethylene Sulfide, Ethylene episulfide, NSC 89690, Thiacyclopropane, 2,3-Dihydro-thiirene
  • Thiirene,3-dihydro-
  • Ethylene sulfide, 98%
  • Ethylene sulfide, purum, >=97.5% (GC)
  • Ethylene sulfide stabilized with ~1% butylmercaptan

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

Appearance
Colorless liquidexp.
Melting point
-109 °Cexp.
Boiling point
57 °Cexp.
Density
1.0130 g/cm³ at 20 °Cexp.
Solubility
Slightly soluble in ethanol and ether, soluble in acetone and chloroformexp.
Vapour pressure
250 mm Hg at 25 °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
60.12 g/molcalc.
Exact mass
60.0034 Dacalc.
LogP (octanol/water)
0.73calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
3calc.
Rings
1calc.
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.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, C1CS1

C1CS1

1 ring, 3 atoms. This chemical is the scaffold itself.

95 other chemicals share this scaffold

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)

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H301Toxic if swallowed.
  • H318Causes serious eye damage.
  • H331Toxic if inhaled.
Precautionary statements (25)
  • 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.
  • P261Avoid breathing 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.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • 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.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • 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.

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

Thiirane suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

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  • Leapchem
    China, Hong KongUnclaimed profile
    ThiiraneGrade, purity and minimum order on request
    Price on request
    View

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Where suppliers are based

1 supplier in 1 country

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Thiirane 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

Chemical intermediate, biocide.

Functional uses

  • Flavouring and nutrient

How it is made

Synthesized by reaction of 2-haloethylthiocyanates with sodium sulfide. Other methods...incl...(1) reaction of ethylene carbonate with sodium or potassium thiocyanate, (2) reaction of ethylene monothiocarbonate with sodium carbonate... ...Methods of synthesis incl...(3) reaction of ethylene oxide with thiourea, inorganic thiocyanates or carbonyl sulfide.

Probably by reaction of ethylene oxide with potassium thiocyanate or thiourea in aqueous solution

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2934.99Indicative HS code

Nucleic acids and their salts, other heterocyclic compounds, not elsewhere classified in heading 2934

World exports in 2024
$26.7B
+15.0% vs 2023, imports $26.3B
2019 to 2024
Top exporters
  1. Ireland26.3%
  2. China15.7%
  3. Singapore10.3%
Top importers
  1. United States24.5%
  2. Germany23.1%
  3. Japan4.5%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Thiirane?

Thiirane is a saturated organic heteromonocyclic parent and an organosulfur heterocyclic compound.

What is the CAS number of Thiirane?

The CAS registry number of Thiirane is 420-12-2.

What is the molecular formula and weight of Thiirane?

The molecular formula of Thiirane is C2H4S and its molar mass is 60.12 g/mol.

What is Thiirane used for?

Chemical intermediate, biocide.

Is Thiirane hazardous?

Thiirane carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour, toxic if swallowed, causes serious eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Thiirane?

Thiirane is usually classified under HS code 293499 (Nucleic acids and their salts, whether or not chemically defined, other heterocyclic…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Thiirane?

CompoundList lists 1 supplier of Thiirane in China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Thiirane?

Suppliers quote Thiirane 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 Thiirane

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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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