Before presenting my suggestion, two things must be clarified: 1) H2N-OH alone is reactive so it cannot be stored unless it is stabilized by conversion into H2NOH.HCl . 2) K2CO3 is a basic salt which is used to remove HCl in order to have hydroxylamine which will react with the nitrile.

Please try mixing the two reactants at room temperature in the presence of sodium bicarbonate using ethanol/H2O as a medium. There is no need to reflux for 12 hours.

The product is expected to form smoothly & you will need some work-up to isolate it from the resulting mixture. Consult some laboratory manuals to see how oximes or amidoximes are separated in the final step.

Thank you, Dr. Matar. I'll try as you advised.