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The reaction of dipolarophiles (several alkenes and alkynes) with ammonium cerium(IV) nitrate ((NH 4 ) 2 Ce(NO 3 ) 6 , CAN(IV)) in acetone under reflux gave 3-acetylisoxazole derivatives. In the case of acetophenone, 3-benzoylisoxazole derivatives were obtained. Moreover, it was found that yields of isoxazole derivatives were improved using ammonium cerium(III) nitrate tetrahydrate ((NH 4 ) 2 Ce(NO 3 ) 5 .4H 2 O, CAN(III))-formic acid.
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