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Sulfur and phosphorus compounds

2-Butanethiol

Also known as butane-2-thiol, sec-Butyl mercaptan, 2-Butylthiol

CAS 513-53-1Formula C4H10SMolar mass 90.19 g/molEC 208-165-2
GHS signal word: Danger. Pictograms: Flammable, Harmful or irritant, Hazardous to the environment 7 suppliers listed
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2-Butanethiol chemical structure, C4H10S, CAS 513-53-1
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorles liquid
Melting point
-165 °C
Boiling point
84 to 85
Density
0.8299 at 17 °C
Flash point
-23 °C
HS code
293090
Category
Sulfur and phosphorus compounds
Illustrative photo, 25 litre white jerry cans of liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is 2-Butanethiol?

Plain description, key identifiers and synonyms

2-Butanethiol is a chemical substance with the molecular formula C4H10S and a molar mass of 90.19 g/mol. Its CAS registry number is 513-53-1. The IUPAC name is butane-2-thiol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
butane-2-thiol
CAS number
513-53-1 CAS number cross-checked
EC number
208-165-2
Molecular formula
C4H10S
UNII
Y2D731QBYN
MDL number
MFCD00004865
InChIKey
LOCHFZBWPCLPAN-UHFFFAOYSA-N
InChI
InChI=1S/C4H10S/c1-3-4(2)5/h4-5H,3H2,1-2H3
SMILES (canonical and isomeric)
CCC(C)S

Synonyms

  • butane-2-thiol
  • sec-Butyl mercaptan
  • 2-Butylthiol
  • sec-C4H9SH
  • 3-Methyl-2-propanethiol
  • secButanethiol
  • 2mercaptobutane
  • 2butanethiol
  • 2Butylmercaptan
  • secButyl thiol
  • 2Butyl mercaptan
  • secButyl thioalcohol
  • 1Methyl1propanethiol
  • 2-Butanethiol, (+-)-
  • 2-Butyl mercaptan
  • 2-Mercaptobutane
  • sec-Butanethiol
  • sec-Butyl thiol
  • 1-Methyl-1-propanethiol
  • sec-Butyl thioalcohol
  • secondary Butylmercaptan
  • 2-Butylmercaptan
  • sec-butylmercaptan
  • sec-Butyl mecaptan
  • 1-methylpropanethiol
Show all 32 synonyms
  • sec.-Butyl thioalcohol
  • 1-methyl-1-propanthiol
  • 2-Butanethiol, 98%
  • sec-Butyl hydrosulfide #
  • 2-Butanethiol, >=98%
  • 1-methyl-1-propyl mercaptan
  • 2-Butanethiol, (+/-)-

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
Colorles liquidexp.
Odour
Obnoxious odorexp.
Melting point
-165 °Cexp.
Boiling point
84 to 85exp.
Density
0.8299 at 17 °Cexp.
Flash point
-23 °Cexp.
Solubility
In water, 1.32 × 10⁺³ mg/L at 20 °Cexp.
Vapour pressure
80.71 mm Hg at 25 °C /Extrapolated/exp.

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
90.19 g/molcalc.
Exact mass
90.0503 Dacalc.
LogP (octanol/water)
1.71calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
1calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
1calc.
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
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment
320NFPA 704 rating

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H315Causes skin irritation.
  • H317May cause an allergic skin reaction.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (29)
  • 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.
  • P271Use only outdoors or in a well-ventilated area.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • 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.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P333 + P317If skin irritation or rash 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.
  • P391Collect spillage.
  • 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

2-Butanethiol suppliers

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

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Where suppliers are based

7 suppliers in 2 countries

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2-Butanethiol 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

Odorant for natural gas.

Manufacture of Cadusafos.

Industrial uses: Intermediate, Other.

Consumer uses: Intermediate.

Functional uses

  • Flavouring and nutrient

How it is made

Reaction of 2-butene with hydrogen sulfide in the presence of a catalyst (usually a halide)

Prepared from 2-iodobutane by means of alcoholic K-S-H solution, ... from 2-bromobutane in the same manner.

Raffinate II (n-butenes, mixed: 45-60% 1-butene, 20-40% 2-butene, 10-20% n-butane, 5% isobutene) + hydrogen sulfide (addition)

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

Frequently asked questions

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

What is 2-Butanethiol?

2-Butanethiol is a chemical substance with the molecular formula C4H10S and a molar mass of 90.19 g/mol. Its CAS registry number is 513-53-1. The IUPAC name is butane-2-thiol.

What is the CAS number of 2-Butanethiol?

The CAS registry number of 2-Butanethiol is 513-53-1.

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

The molecular formula of 2-Butanethiol is C4H10S and its molar mass is 90.19 g/mol.

What is 2-Butanethiol used for?

Odorant for natural gas. Manufacture of Cadusafos. Industrial uses: Intermediate, Other. Consumer uses: Intermediate.

Is 2-Butanethiol hazardous?

2-Butanethiol carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour, causes skin irritation, may cause an allergic skin reaction. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 2-Butanethiol?

2-Butanethiol 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-Butanethiol?

CompoundList lists 7 suppliers of 2-Butanethiol in 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-Butanethiol in India?

1 supplier in India list 2-Butanethiol 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-Butanethiol?

Suppliers quote 2-Butanethiol 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-Butanethiol

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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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