PYRIDAZINIUM YLIDES .2. NEW CARBANION DISUBSTITUTED YLIDES

摘要

The first report of reaction between diazinium ylides and diazonoium salts to give C-disubstituted ylides is proposed. A mechanism is postulated for the reaction. which proceeds via nucleophilic attack rather than by 3+2 cycloaddition, to give C-disubstituted ylides. The intense colour of the products is attributed to an intramolecular charge transfer transition, for which a mechanism is proposed. (C) 1997 Elsevier Science Ltd. [References: 16]