Zirconocene-(μ-Organyl)borate Betaines Derived by Treatment of a (σ-Alkenyl)(σ-alkynyl)zirconocene Complex with Tris(pentafluorophenyl)borane☆
✍ Scribed by Wolfgang Ahlers; Gerhard Erker; Roland Fröhlich
- Book ID
- 101277978
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 385 KB
- Volume
- 1998
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Hydrozirconation of propyne followed by treatment with three molar equivalents of tert-butyl isocyanide to give 16.
Complex 16 contains a five-membered carbocyclic ring, propynyllithium yields the (σ-propenyl)(σ-propynyl)zirconocene complex 11. Its treatment with the organometallic formed by carbon-carbon coupling of the former propenyl and propynyl groups with the CϵN-R reagent, to which a Lewis acid B(C 6 F 5 ) 3 results in transfer of the σ-propynyl group from zirconium to boron followed by insertion of the (η 2 -iminoacyl)(κ-tert-butyl isocyanide)zirconocene moiety is attached. Complex 16 was characterized by an X-ray crystal alkynylborate triple bond into the zirconium carbon bond of the remaining metallaallyl cation to furnish the zirconocene-structure analysis. (µ-hydrocarbyl)borate betaine complex 14. This reacts with