Unprecedented Rearrangement reaction of nitrile oxies and a stericaly congested 4-ylidene-5-isoxazolone

摘要

The reaction between nitrile oxides and 4-diphenylmehtylene-3-phenylisoxazol-5-one (5) proceeeds in an unprecedented fashion to yield 4-diphenylmethylene-2,3,3-trisubstituted derivatives (10).Their structure was determined by an X-Ray diffraction study.