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- W4233118052 abstract "The methoxy signals in the 1H NMR spectrum of cyclopentadienylmanganese dicarbonyl tetramethoxyethylene, C5H5Mn(CO)2[C2(OCH3)4], show a definite temperature-dependence. In CS2 solution the variations of the signals are observed within a single temperature range, while in toluene-d8 two regions of change are found to exist. These data are explained on the basis of two mutually independent ligand movements: a hindered rotation of the olefin ligand around the metalligand bond (ΔG‡194 = 9.8 ± 0.6 kcal/mol), and a hindered movement of the four methoxy groups (ΔG‡263 = 13.8 ± 0.3 kcal/mol, both in toluene-d8. Chiral conformations of the ligand are assumed to be formed when the movement of the methoxy substituents ceases. Cyclopentadienyl-mangan-dicarbonyl-tetramethoxyäthylen, C5H5Mn(CO)2[C2(OCH3)4], zeigt im 1H-NMR-Spektrum eine ausgeprätge Temperaturabhängigkeit der Methoxysignale. In CS2-Lösung finden die Signaländerungen in einem einzigen Temperaturbereich statt, während in Toluol-d8 zwei derartige Bereiche beobachtet werden. Die spektroskopischen Befunde lassen sich mit zwei voneinander unabhängigen Ligandbewegungen erklären, zum einem mit einer gehinderten Rotation des Olefinliganden um die MetallLigand-Bindung als Achse (ΔG‡194 = 9.8 ± 0.6 kcal/Mol), zum anderen mit einer gehinderten Bewegung der vier Methoxygruppen (ΔG‡263 = 13.8 ± 0.3 kcal/Mol, beide in Toluol-d8). Das Einfrieren der letzgenannten Bewegung legt die Annahme chiraler Konformationen des Olefinliganden nahe." @default.
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- W4233118052 date "1975-08-01" @default.
- W4233118052 modified "2023-09-23" @default.
- W4233118052 title "Gehinderte ligandenbewegungen in übergangsmetallkomplexen" @default.
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- W4233118052 doi "https://doi.org/10.1016/s0022-328x(00)86424-4" @default.
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