C4H9Li
64.1 g/mol
Industrial ChemicalDanger
Bu-Li
CAS109-72-8EC203-698-7
Category
Industrial Chemical
Compound Class
Organometallic
Primary Use
Polymerization initiator and strong base
n-Butyllithium (abbreviated as Bu-Li) is an organolithium reagent widely used as a polymerization initiator in the production of elastomers and as a strong base in organic synthesis, including pharmaceutical applications.
Polymerization initiator for elastomers such as polybutadiene and styrene-butadiene-styrene (SBS)Strong base (superbase) for organic compound synthesis in pharmaceutical and chemical industries
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
ReferenceSame Category
N-butylamine
CAS109-73-9
Intermediate for dyes, drugs, rubber additives
ReferenceSame Category
Butyronitrile
CAS109-74-0
chemical and pharmaceutical intermediate
ReferenceSame Category
Allyl cyanide
CAS109-75-1
aliphatic nitrile industrial intermediate
ReferenceSame Category
3-Hydroxypropionitrile
CAS109-78-4
Solvent for cellulose esters and organic synthesis
Safety Reference
Danger
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
H225Highly flammable liquid and vapour
H360May damage fertility or the unborn child
Customs Tariff Classification
The international HS code for Bu-Li (CAS 109-72-8) is 2931.90.
HS code (international, 6-digit)
2931.90
EU CN code (8-digit)
2931 90 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
InChIKey
MZRVEZGGRBJDDB-UHFFFAOYSA-N
SMILES
[Li].CCC[CH2]
Synonyms (5)
- Lithium, butyl-
- N-Butyllithium
- bu-Li
- butyl lithium
- n-BuLi
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