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Organometallic compounds

Butyllithium

Also known as bu-Li, butyl lithium, Lithium, butyl-

CAS 109-72-8Formula C4H9LiMolar mass 64.06 g/molEC 203-698-7
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Harmful or irritant 30 suppliers listed
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Butyllithium chemical structure, C4H9Li, CAS 109-72-8
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Solid
Melting point
-76 °C
Density
0.765 @25 °C
HS code
290110
Category
Organometallic compounds
Illustrative photo, closed white HDPE bottles and amber jars on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Butyllithium?

Plain description, key identifiers and synonyms

Butyllithium is a chemical substance with the molecular formula C4H9Li and a molar mass of 64.06 g/mol. Its CAS registry number is 109-72-8.

Identifiers

Registry numbers, names and line notations, tap to copy

CAS number
109-72-8 CAS number cross-checked
EC number
203-698-7
Molecular formula
C4H9Li
InChIKey
MZRVEZGGRBJDDB-UHFFFAOYSA-N
InChI
InChI=1S/C4H9.Li/c1-3-4-2;/h1,3-4H2,2H3;
SMILES (canonical and isomeric)
[Li].CCC[CH2]

Synonyms

  • bu-Li
  • butyl lithium
  • Lithium, butyl-
  • n-BuLi
  • N-Butyllithium

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
Solidexp.
Melting point
-76 °Cexp.
Density
0.765 @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
64.06 g/molcalc.
Exact mass
64.0864 Dacalc.
LogP (octanol/water)
1.24calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
1calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.75calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.
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
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H250Catches fire spontaneously if exposed to air.
  • H260In contact with water releases flammable gases which may ignite spontaneously.
  • H302Harmful if swallowed.
  • H314Causes severe skin burns and eye damage.
  • H317May cause an allergic skin reaction.
  • H318Causes serious eye damage.
Precautionary statements (31)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P222Do not allow contact with air.
  • P223Do not allow contact with water.
  • P231Handle and store contents under inert gas.
  • P231 + P232Handle and store contents under inert gas. Protect from moisture.
  • P233Keep container tightly closed.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • 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.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P335 + P334If on skin: Brush off loose particles from skin. Immerse in cool water or wrap in wet bandages.
  • 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.
  • 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.
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • 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.
  • P402 + P404Store in a dry place. Store in a closed container.
  • 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

Butyllithium suppliers

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

All 30 suppliers
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Where suppliers are based

30 suppliers in 4 countries

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Butyllithium 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

Industrial uses: Diluent, Intermediate, Processing aids not otherwise specified.

Functional uses

  • Catalyst

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 Butyllithium is traded under.

HS 2901.10Indicative HS code

Saturated

World exports in 2024
$8.47B
+23.9% vs 2023, imports $7.66B
2019 to 2024
Top exporters
  1. United States79.8%
  2. Canada10.1%
  3. Germany1.4%
Top importers
  1. China34.6%
  2. United States12.2%
  3. Sweden5.0%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Butyllithium?

Butyllithium is a chemical substance with the molecular formula C4H9Li and a molar mass of 64.06 g/mol. Its CAS registry number is 109-72-8.

What is the CAS number of Butyllithium?

The CAS registry number of Butyllithium is 109-72-8.

What is the molecular formula and weight of Butyllithium?

The molecular formula of Butyllithium is C4H9Li and its molar mass is 64.06 g/mol.

What is Butyllithium used for?

Industrial uses: Diluent, Intermediate, Processing aids not otherwise specified.

Is Butyllithium hazardous?

Butyllithium carries the GHS signal word "Danger". Main hazards: catches fire spontaneously if exposed to air, in contact with water releases flammable gases which may ignite spontaneously, harmful if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Butyllithium?

Butyllithium is usually classified under HS code 290110 (Saturated). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Butyllithium?

CompoundList lists 30 suppliers of Butyllithium in China, India, United States and Japan. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Butyllithium in India?

8 suppliers in India list Butyllithium on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Butyllithium?

Suppliers quote Butyllithium 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 Butyllithium

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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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