π/σ ratios of > 96: < 4 to 15:85 (at 299 K) occur in the complexes 1, depending on the aryl substituents. Aside from this strong electronic effect, marked solvent and temperature effects could also be detected. These findings are of great importance for an understanding of the bonding behavior of adducts of carbonyl compounds and metal-complex fragments.
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Méndez et al. (1990) studied this question.
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