Halide displacement, using the suitable organic halide and sodium hydrogen sulfide has also been utilized. The conductive additive may be lithium chloride, quaternary ammonium halide, or other. The solubility of halide salts increases from fluoride to iodide. Lithium diorganocuprates can be formed by reacting alkyl lithium species with copper(I) halide. Such ions are present in all ionic halide salts. The Krapcho decarboxylation is the chemical reaction of esters with halide anions. Hydrogen fluoride is the only hydrogen halide that forms hydrogen bonds. Gases used include, neon, argon, xenon, sodium, metal halide, and mercury. This catalyst standardly consists of a copper halide and an amine-based ligand. The organozinc reagent is generated via an oxidative addition into the alkyl halide. The Wittig reagent is itself prepared easily from triphenylphosphine and an alkyl halide. The disposal of the alkali halide salt is problematic. The metal is obtained through electrolysis of its halide salts. Chemically, halothane is an alkyl halide (not an ether like many other anesthetics). Related compounds containing both halide and organic substituents on phosphorus are fairly common.