Abstract
The dynamic aspects of the stereoisomerizations of some bis(β-diketonato) complexes have been investigated with the aid of permutational analysis and topological representations. The analysis indicates that the lowest energy rearrangement mode (M 4) occuring in such complexes, and involving a reversal of the helecity of the structure, is permutationally equivalent to the “one-ring flip” mechanism of diaryl derivatives of the type Ar 2ZX, which are shown to be stereochemically correspondent to the bis-chelate molecules. The activation energies associated with such arrangements have been determined by variable temperature NMR studies. Only for bis(acetylacetonato) bis-(triphenylphosphine)ruthenium(II) is the activation barrier high enough to allow resolution of the two enantiomers at ambient temperatures.
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