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Three isoxazoline tetracycles were obtained enantiomerically pure by intramolecular 1,3-dipolar cycloaddition. The characterization of the new compounds was performed by high-resolution 1 H and 13 C NMR spectroscopy. The relative configuration of the new chiral centers was determined by NOESY experiments and confirmed by single-crystal X-ray structural analysis.
Direct reaction between magnesium and 1-methoxy-2-propanol yielded the title complex which has been characterized by X-ray crystallography. The molecular structure consists of a centrosymmetric tetrameric unit in which the Mg atoms are five- or six-coordinated by terminal, triple- and double-bridging chelating alkoxo ligands.
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