Abstract
Structural studies of seven complexes of ligands derived from various azetidine- and oxetane-containing ligands characterise the difference in reactivity of both free and bound forms of these two four-membered heterocycles. The relatively unreactive azetidine ring is preserved in a variety of transformations, whereas facile opening of the oxetane ring provides a convenient pathway to complexes with pendent functionality.
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Notes
Where the coordination preferences of the metal ion are such that this binding is not favoured, the ligand, bound quadridentate in a square-planar species, appears to prefer the common, cyclam-like conformation where both six-membered chelate rings adopt the chair conformation [33]
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This research was supported by the National Research Foundation of Korea (Grant 2010-0016624).
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Dedicated to Professor Leonard F. Lindoy, the “compleat coordination chemist” and master of macrocycles, on the occasion of his 75th birthday.
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Lee, Y.H., Kim, M., Woo, A.R. et al. Small-ring heterocycles as components of multidentate ligands: some structural studies relating to ring opening. J Incl Phenom Macrocycl Chem 71, 395–407 (2011). https://doi.org/10.1007/s10847-011-9931-8
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DOI: https://doi.org/10.1007/s10847-011-9931-8