Butyllithium

Butyllithium may refer to one of 5 isomeric organolithium reagents of which 3 are commonly used in chemical synthesis:

• n-Butyllithium, abbreviated BuLi or ⁿBuLi
• sec-Butyllithium, abbreviated sec-BuLi or ^sBuLi, has 2 stereoisomers, but is commonly used as racemate
• tert-Butyllithium, abbreviated tert-BuLi or ^tBuLi
• Isobutyllithium