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Formation of 2-acyl-2H-azirines was confirmed in thermolyses of 8-acylvinyl azides to establish the generality of azirine formation from vinyl azides.Unusual C-C bond fission of 3-unsubstituted 2acyl-2H-azirine to give oxazole was found to be a base catalyzed reaction.On the other hand, 3-substituted analogues were found to undergo acid-catalyzed reaction to give oxazoles.
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Taniguchi et al. (1978) studied this question.
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