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1,2,4‐Oxadiazole 4‐oxides display nitronic reactivity and selectivities identical to those of N‐methyl‐C‐phenyl nitrone, which is a typical acyclic nitrone, affording comparable amounts of endo‐ and exo‐5‐alkoxyisoxazolidines. The exo stereoisomers undergo an easy rearrangement under the reaction conditions to yield oxadiazolinic esters. The structures of the adducts have been confirmed by X‐ray structures...
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