Oxaziranes spectra

The oxaziranes are colorless and they do not absorb in the UV region. Aryl-substituted oxaziranes show only the absorption of the aryl group. The oxaziranes are also transparent in the double bond region of the infrared spectrum, but they show a well developed band near 1400 cm" which has been considered characteristic for oxa-ziranes. ... 

The oxazirane structure (12) for kasugamycin was also eliminated by negative reactions characteristic of the oxazirane group (4) and by the observation of no proton corresponding to an oxazirane group in the NMR spectrum of kasugamycin. 

Since many oxaziranes have limited stability in alkaline solutions ibis, synthesis is not characterized by high yields in most oases I(. dora. however, extend the spectrum of available oxaziranes considerably, and a dramatic example of this is the preparation of the luomcri ... 

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