Chemical Reactivity of Alkylidene Phosphoranes and the Relevant Phosphonium Salts Toward Some Carbon-Nitrogen Systems

The published work on the main chemical reactions of alkylidene phosphoranes and the relevant phosphonium salts with different carbon-nitrogen systems are thoroughly discussed, whereas their importance as synthones in heterocyclic chemistry are indicated briefly, and the long controversy concerning their structure is only summarized in order to expose the latest results on the subject. The literature has been fully covered up the last two decades.