Ashim J. Thakur, Anima Boruah, Dip& Prajapati, and Jagir S. Sandhu* ... Division of Organic Chemistry Regional Research Laboratory, Jorhat - 785 006, Assam, India. ... Abstract: A new and efficient method for the rearrangement of oximes 1 has been achieved by a simple reaction of a ketoximes with bismuth trichloride under microwave irradiation in the solid state. ... The Beckmaun rearrangement of ketoximes has been used extensively m