Metallocenylborane, IV. Diborylverbindungen des Ferrocens und Cymantrens.
Open Access
- 1 August 1976
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 31 (8) , 1028-1034
- https://doi.org/10.1515/znb-1976-0805
Abstract
Ferrocene reacts with BI3 and BBr3 to give 1,1′-bis(dihalogenboryl)ferrocenes; the cyclopentadienylring in cymantrene is twice borylated by BI3. By halogen exchange with AsF3 and AsCl3, by methylation with Sn(CH3)4, by cleavage of (C2H5)2O, by redox reaction with (CH3S)2 and by reaction with (C2H5)2NH the corresponding diborylferrocenes are obtained. The air-sensitive halogenborylferrocenes form donor-acceptor compounds with Lewis bases. 1H, 11B and 13C NMR data reflect increasing π-acceptor properties with increasing Lewis acidity of the boryl groups.Keywords
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