Abstract: The thermolytical decomposition of azides with an ester group in the ortho
position gives two exothermic reaction steps . It was proved by synthesis
that the first thermolytical reaction step gave, as ring closure product,
the isoxazoles with the alkoxy group in the isoxazole ring, whereas at slightly
higher temperatures a rearrangement to isoxazolones with the alkoxy group in the
quinoline, coumarin or pyridine ring took place.
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