Nitrosation of alpha,alpha'-dianions produced from ketones using a cou
ple of bases was carried out with tert-butyl nitrite(tert-BuONO) in et
her, and then two regioisomers of oximes(but not acetone)were obtained
simultaneously. The ratio of these regioisomers was remarkably revers
ed by the addition of hexamethylphosphoric triamide(HMPA).