Oxaziranes 2- aryl

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. ... 

Here a typical property of three-membered rings wdth two hetero atoms is shown and this property is also found in the diaziridines. Only with the oxaziranes which are substituted by aryl groups in the 3-position does the hydrolysis by acids occur according to Eq. (14) with formation of an aromatic aldehyde and alkyl hydroxylamine. 

Oxaziranes which carry an aryl group on nitrogen occupy a special position. Sometimes, they rearrange even at room temperature, so they cannot easily be isolated. For preparative purposes, rearrangement in hot xylene is suitable. For the rearrangements of iV-alkyl-oxa-... 

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