摘要:
A new method for the nucleophilic substitution of phenols at the ortho position has been developed which uses as the key step the trapping of an alpha-ketosulfonium salt generated by a Pummerer rearrangement of 2-(phenylsulfinyl)phenols. In addition to preparing 2-halo- and 2-(acyloxy)phenols, this ''vicarious substitution'' also allows the preparation of biaryls in fair yield.