Abstract
A series of diastereomeric closo-(η1,2-dicyclopentenyl)rhodacarborane complexes with the agostic C--H...Rh bond were synthesized starting from mono-C-substituted anionic nido-carboranes [nido-7-R-7,8-C2B9H11]–. The resulting diastereomeric mixtures were separated into individual isomers by either crystallization or chromatography. The structures and the stereochemistry of the diastereomeric complexes were studied in detail by 1H and 13C NMR spectroscopy. The relative configurations of two key isomers were established by X-ray diffraction analysis. The mechanism of the stereospecific formation of diastereomeric complexes is discussed.
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