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Sulfur and phosphorus compounds

2-Propanethiol

Also known as Propane-2-thiol, Isopropyl mercaptan, 2-Propylthiol

CAS 75-33-2Formula C3H8SMolar mass 76.16 g/molEC 200-861-4
GHS signal word: Danger. Pictograms: Flammable, Acute toxicity (severe), Harmful or irritant 16 suppliers listed
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2-Propanethiol chemical structure, C3H8S, CAS 75-33-2
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless liquid
Melting point
-130.7 °C
Boiling point
52.5 °C
Density
0.8143 at 20 °C/4 °C
Flash point
-34.4 °C
HS code
293090
Category
Sulfur and phosphorus compounds
UN number
UN 2402
Illustrative photo, an amber glass solvent bottle with clear liquid on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is 2-Propanethiol?

Plain description, key identifiers and synonyms

Propane-2-thiol is an alkanethiol that is propane substituted by a sulfanyl group at position 2.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
propane-2-thiol
CAS number
75-33-2 CAS number cross-checked
EC number
200-861-4
Molecular formula
C3H8S
UNII
E52LR62ETC
MDL number
MFCD00004863
InChIKey
KJRCEJOSASVSRA-UHFFFAOYSA-N
InChI
InChI=1S/C3H8S/c1-3(2)4/h3-4H,1-2H3
SMILES (canonical and isomeric)
CC(C)S

Synonyms

  • Propane-2-thiol
  • Isopropyl mercaptan
  • 2-Propylthiol
  • Propanethiol-(2)
  • iso-C3H7SH
  • 2mercaptopropane
  • 2propanethiol
  • i-propylthiol
  • 2Propylmercaptan
  • 1Methylethanethiol
  • 2-Propyl mercaptan
  • Isopropanethiol
  • Isopropylthiol
  • 2-Mercaptopropane
  • 1-Methylethanethiol
  • 2-Propylmercaptan
  • Isopropylmercaptan
  • propan-2-thiol
  • isopropyl thiol
  • isopropane thiol
  • 2-propanthiol
  • 2-propane thiol
  • iPrSH
  • 2 -propylmercaptan
  • 2-Propanethiol, >=97%
Show all 28 synonyms
  • 2-Propanethiol, >=98%
  • 2-Propanethiol, analytical standard
  • 2-Propanethiol, >=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

Appearance
Colorless liquidexp.
Odour
Extremely unpleasant odorexp.
Melting point
-130.7 °Cexp.
Boiling point
52.5 °Cexp.
Density
0.8143 at 20 °C/4 °Cexp.
Flash point
-34.4 °Cexp.
Solubility
Miscible in ethanol, ether, very soluble in acetone, soluble in chloroformexp.
Vapour pressure
277.3 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
76.16 g/molcalc.
Exact mass
76.0347 Dacalc.
LogP (octanol/water)
1.32calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
4calc.
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
GHS02: Flammable
Flammable
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H302Harmful if swallowed.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H331Toxic if inhaled.
Precautionary statements (28)
  • 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 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • 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 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • 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.
  • 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 2402

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-Propanethiol suppliers

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

All 16 suppliers
16 of 16 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

16 suppliers in 3 countries

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2-Propanethiol 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

Standard for petroleum analysis, intermediate.

Lower molecular weight thiols are used as odorants in natural and liquified petroleum gas. (Thiols).

Natural gas odorant.

Industrial uses: Intermediate, Fragrance, Other.

Consumer uses: Intermediate, Fragrance.

Functional uses

  • Flavouring and nutrient

How it is made

Propylene and hydrogen sulfide.

Thiols can be prepared by a variety of methods. The most-utilized of these synthetic methods for tertiary and secondary thiols is acid-catalyzed synthesis, for normal and secondary thiols, the most-utilized methods are free-radical-initiated, alcohol substitution, or halide substitution, for mercaptoalcohols, the most-utilized method is oxirane addition, and for mercaptoacids and mercaptonitriles, the most-utilized methods are Michael-type additions. (Thiols)

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

Frequently asked questions

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

What is 2-Propanethiol?

Propane-2-thiol is an alkanethiol that is propane substituted by a sulfanyl group at position 2.

What is the CAS number of 2-Propanethiol?

The CAS registry number of 2-Propanethiol is 75-33-2.

What is the molecular formula and weight of 2-Propanethiol?

The molecular formula of 2-Propanethiol is C3H8S and its molar mass is 76.16 g/mol.

What is 2-Propanethiol used for?

Standard for petroleum analysis, intermediate. Lower molecular weight thiols are used as odorants in natural and liquified petroleum gas. (Thiols). Natural gas odorant. Industrial uses: Intermediate, Fragrance, Other. Consumer uses: Intermediate, Fragrance.

Is 2-Propanethiol hazardous?

2-Propanethiol carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour, harmful if swallowed, causes skin irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 2-Propanethiol?

2-Propanethiol 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 2-Propanethiol?

CompoundList lists 16 suppliers of 2-Propanethiol in China, United States and India. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy 2-Propanethiol in India?

1 supplier in India list 2-Propanethiol on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of 2-Propanethiol?

Suppliers quote 2-Propanethiol 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-Propanethiol

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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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