Rearrangement of an oxime to an amide in presence of strong acid is called:
Conversion of Ketoximes to N- substituted amides is known as Beckmann rearrangement. In this rearrangement migration takes place from carbon to nitrogen. The reaction is catalyzed by acidic reagents. The main function of the acidic catalyst is to convert -OH of the oxime into a better leaving group by protonation.