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Reaction of alkenes and dienes with t-butylmagnesium halides and zirconocene dihalides. A convenient procedure for hydrozirconation and a novel t-butylzirconation of conjugated alkenes

✍ Scribed by Ei-ichi Negishi; Joseph A. Miller; Tadao Yoshida

Book ID: 104242224
Publisher: Elsevier Science
Year: 1984
Tongue: French
Weight: 247 KB
Volume: 25
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)91032-9

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✦ Synopsis

The reaction of nonconjugated monosubstituted alkenes with t-BuMgCl and Cl2ZrCp2 at room temperature produces the corresponding monoalkylzirconium derivatives in high yields, while conjugated alkenes undergo either a novel t-butylzirconation or hydrozirconation depending on the reaction conditions. HydrozirconationL

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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