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Enantioface-Selective Coordination of Prochiral 1,3-Dienes to Planar-Chiral Cyclopentadienyl-Ruthenium Complexes

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posted on 10.05.2004 by Yuji Matsushima, Kiyotaka Onitsuka, Shigetoshi Takahashi
The treatment of planar-chiral (η51-cyclopentadienylphosphine)bis(acetonitrile)ruthenium complexes 1 with prochiral dienes led to the ligand-exchange reaction that gave (η51-cyclopentadienylphosphine)(η4-diene)ruthenium complexes 46 and 811 with high enantioface selectivity (up to >99% de). The configuration of the (η4-diene)ruthenium complexes was determined by crystallographic study of (η4-isoprene)ruthenium complex 6b-I and spectral analyses, including NOE measurements. The selectivity of the reaction is under thermodynamic control of the resulting η4-diene complexes and is affected by the substituents on both the cyclopentadienyl ligand and the diene.

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