Beckmann rearrangement is a reaction that involves the conversion of an oxime into an amide by acid-catalyzed rearrangement. Some synonyms for this reaction include the Beckmann fragmentation, Beckmann transformation, and Beckmann conversion. The reaction was first discovered in 1886 by Ernst Otto Beckmann, a German chemist. Since then, it has become an important reaction in organic chemistry and has been used in the synthesis of various organic compounds, including pharmaceuticals, agrochemicals, and natural products. The Beckmann rearrangement can be carried out using different reaction conditions and can be applied to a wide range of oximes, making it a versatile and useful reaction in the field of organic synthesis.