Measurement of Barriers for Alkene Dissociation and for Inversion at Zirconium in a d 0 Zirconium−Alkyl−Alkene Complex

Reaction of zirconocene dichloride with

Reaction of zirconocene dichloride with alkyllithiums or alkyl grignard reagents as a convenient method for generating a “zirconocene” equivalant and its use in zirconium-promoted cyclization of alkenes, alkynes, dienes, enynes, and diynes

✍ Ei-ichi Negishi; Fredrik E Cederbaum; Tamotsu Takahashi 📂 Article 📅 1986 🏛 Elsevier Science 🌐 French ⚖ 225 KB

Treatment of Cl2ZrCp2 with 2 equiv of alkylmetals (RM) containing Li or Mg, e.g., n-BuLi, in THF produces organozirconium species that act as sources of "ZrCp2," the latter product being a convenient reagent for preparing zirconacycles. We recently reported a bicyclization reaction of enynes3 with