Recyclization of 2-amino- and 2-methylamino-2-trifluoromethyl-5,5-dimethyl- tetrahydro-4-pyrone oximes to 5-amino- and 5-methylamino-5-trifluoromethyl-3-(2-hydroxy-1,1-dimethylethyl)-Δ2-isoxazolines

The reactions of hydroxylamine with 2-amino- and 2-methylamino-2-trifluoromethyl-5,5-dimethyltetrahydro-4-pyrones yield 2-amino- and 2-methylamino-2-trifluoromethyl-5,5-dimethyltetrahydro-4-pyrone oximes, which can be converted to 5-amino- and 5-methylamino-5-trifluoromethyl-3-(2-hydroxy-1,1-dimethylethyl)-Δ²-isoxazolines, respectively, by heating in ethanol.