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A Lewis acid promotes the E- to Z-isomerization of carbonyl-conjugated nitrones. The MgBr2•Et2O-catalyzed cycloadditions to allylic alcohols lead to the exclusive formation of the exo-stereoisomers of isoxazolidine-5-methanols. Participation of the Z-nitrone/MgBr2 complexes is suggested.
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Kanemasa et al. (1995) studied this question.
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