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Absolute configurations of the chiral ligand sites were
controlled by inspection of anomalous dispersion ef-
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[7] Approximately, each oxygen triple lies within the mirror plane
that would transform either of the two Cp%-ring normals into
each other.
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Financial support by the BMBF, Bonn (Project Nr.
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thank S. Samba for technical assistance and Professor
U. Behrens (Hamburg) for his continuous help in over-
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