Abstract
AbstractIn this comprehensive study, we report the syntheses and crystal structures of 6 fused oxazolidine (FOX) bicycles and 22 complexes with FOX ligands. The structures are compared to the few FOX complexes found in literature. For our investigations, we developed synthetic strategies to selectively synthesize chiral or achiral FOX bicycles with pyridyl substituents. The coordination chemistry of the chiral and achiral FOX compounds with first‐row transition metals is discussed in an in‐depth analysis of the crystal structures. We found that the binding modes of the ligands are dependent on the configuration of the FOX backbone and on the steric demand of the substituents which were introduced to the pyridyl groups. The configuration of the FOX ligands is retained during the coordination of metal(II) ions such as Mn2+, Fe2+, Co2+, Ni2+, Cu2+. Reactions of these metal ions with chiral FOX ligands lead to the formation of chiral complexes. In contrast, stronger Lewis acidic metal(III) ions, such as Fe3+ or Al3+, induce an isomerization of the chiral FOX ligands to their achiral diastereomers.
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