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
*isobutyllithium
*
''tert''-Butyllithium, abbreviated ''tert''-BuLi or
tBuLi
{{Chemistry index