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Hexyllithium

From Wikipedia, the free encyclopedia
n-Hexyllithium
Names
IUPAC name
Hexyllithium
Other names
HxLi, NHL
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.100.655 Edit this at Wikidata
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[1]
GHS labelling:
Water-react. 1, Pyr. Sol. 1Skin Corr. 1A
Danger
H250, H260, H314 [note 1]
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).

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.

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.[2] 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.[3]

Notes and references

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Notes

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  1. ^ Within the European Union, the following additional hazard statement (EUH014) must also be displayed on labelling: Reacts violently with water.

References

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  1. ^ Index no. 003-002-00-X of Annex VI, Part 3, to Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006. OJEU L353, 31.12.2008, pp 1–1355 at p 340.
  2. ^ Terry L. Rathman "Hexyllithium" Encyclopedia of Reagents for Organic Synthesis, 2001. doi:10.1002/047084289X.rh024
  3. ^ Abel, Edward W.; Stone, F. Gordon A.; Wilkinson, Geoffrey, eds. (1995), Main-Group Metal Organometallics in Organic Synthesis, Comprehensive Organometallic Chemistry II, vol. 11, Elsevier, p. 3, ISBN 0-08-042318-3.