Organolithium Reagents

Reactivity and Applications of Organolithium Reagents

Organolithiums are characterized by the direct carbon-lithium bond and are typically compared to other carbanionic compounds, such as Grignard reagents. These reagents are widely used across organic and organometallic chemistry for their exceptional reactivity and selectivity.

Typical applications include:

• Nucleophilic additions to aldehydes and ketones, generating secondary and tertiary alcohols
• Deprotonation reactions of alcohols, amines, and other acidic protons
• Formation of lithium enolates, which undergo further reactions with electrophiles
• Synthesis of organometallic complexes for catalysis and cross-coupling
• Initiation of anionic polymerizations and formation of functionalized polymers

Traditional Organolithium Reagents

Traditional organolithiums display high sensitivity to both air and moisture, and are provided in our Sure/Seal™ packaging system to prolong their shelf life.

Alkyllithium Reagents for Synthesis

Alkyllithium reagents include n-butyllithium and its isomers, chiral sec-butyllithium, and t-butyllithium, which are widely used as strong bases and nucleophiles in organic synthesis. They serve as sources of butyl carbanions in Grignard-type reactions, initiators for anionic polymerization, and intermediates for functional group transformations.

These reagents are offered in various hydrocarbon and Lewis base solvent systems such as hexane, heptanes, methyl tetrahydrofuran (MeTHF), and diethyl ether.

Specialty Organolithium Reagents

Specialty organolithium complexes, such as lithium (trimethylsilyl) acetylide solution, phenyllithium solution, and lithium pentamethylcyclopentadienide support advanced synthetic applications.

• Lithium (trimethylsilyl)acetylide is used for ferrocene synthesis.
• Phenyllithium enables the conversion of γ- and δ-thiolactams to thioiminium salts in combination with Grignard reagents.
• Lithium pentamethylcyclopentadienide serves as a catalytic base in palladium-catalyzed cross-coupling reactions.

Lithium Amides

Lithium amides such as lithium diisopropylamide (LDA) and lithium bis(trimethylsilyl)amide (LiHMDS), are often grouped with organolithium reagents even though they do not possess a direct carbon-lithium bond. These reagents are strong, non-nucelophilic lithium bases and are often more selective than alkyllithiums.

• Lithium diisopropylamide (LDA) is used for enolate formation and selective deprotonation.
• Lithium bis(trimethylsilyl)amide (LiHMDS) is used to generate acetylides and enolates.

Non-Pyrophoric Organolithium Reagents

Our non-pyrophoric organolithium formulations have replaced small-chain hydrocarbon solvents with a poly-α-olefin (PAO)/solvent mixture (n-butyllithium solution in PAO/hexanes). These innovative formulations have been proven to be non-pyrophoric according to the EPA's SW-846 Test Method 1050.

They retain their effectiveness in a variety of reactions, including C-H lithiations, nucleophilic substitutions, (S_NAr), addition and halogen-exchange reactions.

Additionally, they are compatible with traditional lithiation additives such as KOtBu and TMEDA. These new formulations are also packaged in our Sure/Seal™ system to help extend the shelf life of these reagents.