Hexyllithium

n-Hexyllithium, C6H13Li, sometimes abbreviated to HxLi or NHL, is an organolithium compound used in organic synthesis as a strong base or as a lithiation reagent. It is usually encountered as a colorless or pale yellow solution in hexanes. Such solutions are highly sensitive to air and can ignite when treated with water.

n-Hexyllithium
Names
IUPAC name
Hexyllithium
Other names
HxLi, NHL
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.100.655
EC Number
  • 404-950-0
  • InChI=1S/C6H13.Li/c1-3-5-6-4-2;/h1,3-6H2,2H3;
    Key: RMKNFFPDYCVCDI-UHFFFAOYSA-N
  • InChI=1/C6H13.Li/c1-3-5-6-4-2;/h1,3-6H2,2H3;/rC6H13Li/c1-2-3-4-5-6-7/h2-6H2,1H3
    Key: RMKNFFPDYCVCDI-ZLJYRZARAB
  • [Li+].CCCCC[CH2-]
Properties
C6H13Li
Molar mass 92.11 g·mol−1
Reacts with water
Solubility in other solvents Soluble in hydrocarbons, ether, and THF
Acidity (pKa) approx. 40
Hazards
GHS labelling:
Danger
H250, H260, H314
P210, P222, P223, P231+P232, P260, P264, P280, P301+P330+P331, P302+P334, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P335+P334, P363, P370+P378, P402+P404, P405, P422, P501
Related compounds
Methyllithium
n-Butyllithium
tert-Butyllithium
Phenyllithium
Neopentyllithium
Propyllithium
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

In terms of chemical properties, hexyllithium and n-butyllithium (BuLi) are very similar. As a base, hexyllithium generates n-hexane as a byproduct rather than gaseous butane, which results from the use of BuLi. Another advantage for HxLi is that it is slightly less reactive. Both of these aspects encourage industrial applications. It is commercially available as a solution in mixed hexanes, usually at a concentration of about 2 M for laboratory use or 33% for industrial use.

As for BuLi, the structure and formula for HxLi are often depicted as a monomer. Like all organolithium compounds, it exists as clusters in solution and as a solid.

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