Vinyllithium 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.
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.
Vinyllithium Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
