SELECTIVE FUNCTIONALISATION PART 10. THE NITRATION OF PHENOLS BY PYRIDDINE DERIVATIVES CARRYING A TRANSFERABLE NITRO GROUP

Article abstract of DOI:10.1016/S0040-4020(01)86158-5

Pyridinium salts bearing carboxylate side chains and pyridones are shown to react with nitronium tetrafluoroborate or nitrogen dioxide to yield activated intermediates capable of selectively nitrating phenol ortho to the hydroxyl group with virtually comp