Am. Moiseenkov et al., UNUSUAL TRANSFORMATION OF TRIMETHYLSILYLOXYISOXAZOLIDINES INITIATED BY THE FLUORIDE-ION, Russian chemical bulletin, 43(3), 1994, pp. 420-423
It was found that opening of the isoxazolidine ring of 6a alpha-isopro
penyl-1 alpha/beta- trimethylsilyloxy-3,3a alpha,4,5,6,6a-hexahydro-(1
H)- cyclopent[c]isoxazoles by the F- ion initially gives an intermedia
te, a tertiary nitrosocompound detected by UV and NMR spectroscopy. It
s transformation, finally, into alpha,beta-unsaturated aldoximes proba
bly involves an unprecedented allylic migration of the nitroso group.