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- W1977364454 abstract "Tris(1,3-diphenyl-1,3-propanedionato)germanium(IV) [Ge(bzbz)3]+ was prepared as crystalline perchlorate, and resolved by the crystallization of its salt with hydrogen (R,R)-O,O-dibenzoyltartrate. The patterns of UV and circular dichroism spectra are very similar to those of [Si(bzbz)3]ClO4. The racemization of the Δ-[Ge(bzbz)3]ClO4 was studied kinetically in acetonitrile at 40–60 °C to find the rate law: Rate=krac[complex], where krac=9.86×10−5 s−1 at 50 °C. The activation parameters (ΔHeweq=99±2 kJ mol−1 and ΔSeweq=−17±2 J K−1 mol−1) are very similar to those of tris(acetylacetonato)germanium (IV) complex. Compared with the rate of ligand isotopic exchange, the racemization should proceed via intramolecular mechanism. The steric effect coming from the substituents on the chelate ring should play an important role in determining the racemization rate." @default.
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- W1977364454 date "1979-05-01" @default.
- W1977364454 modified "2023-09-25" @default.
- W1977364454 title "Preparation, Optical Resolution, Racemization, and Ligand Isotopic Exchange of Tris(1,3-diphenyl-1,3-propanedionato)germanium(IV) Perchlorate in Acetonitrile" @default.
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- W1977364454 doi "https://doi.org/10.1246/bcsj.52.1363" @default.
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