The fact that many oximes exist in stable syn-and anti-forms and that the oxime of cyclohexanone-4-carboxylic acid2 can be resolved has led to the belief that, in these compounds, the nitrogen atom probably exists in a stable tetrahedral form. The work of Meisenheimer3 has established that many substituted hydroxylamines of the type RR'NOH cannot be resolved and the investigations of many others have failed to find an optically- ...