The Organolithium reagent reference article from the English Wikipedia on 24-Apr-2004
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Organolithium reagent

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An organolithium reagent is a carbon nucleophile similar to a Grignard reagent. Preperation of Organolithium reagents is usually achieved by reaction of organohalogen with lithium metal, i.e. R-X +2Li => R-Li + LiX

Organolithium reagents are used in organic and in organic synthesis, and are known under the collective class of organometallic compounds.