Zirconocene Complexes of [2.2]Paracyclophanes with Formal Triple Bonds in the Bridges
- 1 January 1994
- journal article
- letter
- Published by Georg Thieme Verlag KG in Synlett
- Vol. 1994 (08) , 653-654
- https://doi.org/10.1055/s-1994-22963
Abstract
Zirconocene complexes of [2.2]paracylophanes with formal triple bonds in the bridges, corresponding to zirconacyclo-propenes, were synthesized from [2.2]paracylophan-1-ene (1) and 1,9(10)-dibromo[2.2]paracyclophan-1,9-diene (5) via their vinyl lithium derivatives and characterized by spectroscopic methods. The zirconocene-alkyne complexes 7, 9 react with bromine or iodine with loss of the bis(cyclopentadienyl)zirconium moiety to yield the expected stable halogenated products 8 and 10, respectively. Insertion of 2-butyne into the initially formed 16e complexes gave zirconacyclopentadiene complexes 3, 9.Keywords
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