Abstract
The slow rate of isomerization of cationic phosphaferrocene species (E)-1 (easily prepared from the parent alcohol) to the more stable (Z)-1 provides selective access to both possible diastereomeric products by addition of nucleophiles from a direction trans to the CpFe moiety. Configurational assignment of the species involved is made on the basis of NMR data and has been confirmed by X-ray structural analysis.
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