Vinyllithium

VINYL LITHIUM Chemische Eigenschaften,Einsatz,Produktion Methoden

• Verwenden

  Vinyl lithium is a reactive intermediate for the formation of vinyl alcohols from aldehydes, vinyl ketones from organic acids, vinyl sulfides from disulfides, and monosubstituted alkenes from organic halides.

• Definition

  ChEBI: Vinyllithium is a vinyllithium compound and an alkenyllithium compound.

• synthetische

  Vinyllithium is prepared by a variety of methods. Direct metalation of Ethylene with Lithium metal in dimethoxymethane yields vinyllithium contaminated with lithium hydride, and other organolithio species, such as butyllithium and 1,4-dilithiobutane. Direct formation from ethylene can also be accomplished using Potassium t-Butoxide, n-Butyllithium, and TMEDA (N,N,N′,N′-Tetramethylethylenediamine) in hexane at -40 °C, followed by treatment of the vinylpotassium with Lithium Bromide. The lithium-halogen exchange reaction has been used, starting from vinyl chloride and lithium/sodium dispersions, or from vinyl bromide with 2 equiv of t-Butyllithium in either a Trapp solvent mixture at - 120 °C or ether at -78 °C. This is the most convenient procedure, but lithium halide is formed during the reaction and is present as a contaminant. Halide-free vinyllithium can be prepared by transmetalation of Tetravinylstannane with phenyl- or butyllithium, of tetravinyllead with either lithium metal or Phenyllithium, or of divinylmercury with lithium dispersion in pentane.

• Lager

  As with most alkyllithium reagents, vinyllithium reacts readily with moisture. Solid vinyllithium should be maintained at -25 °C or below, under an inert atmosphere. The solid suffers a loss in activity with time and should be used immediately upon preparation. Solutions of the reagent in ether or THF, under an inert atmosphere, are stable for up to 1 week at rt. Solid vinyllithium is violently pyrophoric, yielding a brilliant red flash on contact with air.

• läuterung methode

  Purification of Vinyllithium: ether solutions can be evaporated under an inert atmosphere and the resulting solid washed with anhydrous pentane or hexane.

VINYL LITHIUM Upstream-Materialien And Downstream Produkte

Vinyllithium Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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