Préparation de quelques 4‐nitroisoxazoles à partir de pseudonitrosites de cétones éthyléniques du type chalcone

The Synthesis of some 4‐Nitroisoxazoles from Pseudonitrosites of Chalcones The action of dinitrogen trioxide with α,β‐unsaturated ketones of the chalcone type leads to pseudonitrosites ( Table 1 ) which are cyclized to 4‐nitro‐3,5‐diarylisoxazoles ( Table 2 ).