The Study Of Intramolecular Cyclization Of Phosphinidene Complexes With Alkenyl

The carbene-like chemistry of electrophilic terminal phosphinidene complexes [RP-M(CO)n](M = Cr, Mo, W, Fe; n = 4, 5) have been well developed. Previous studies have shown the intermolecular cycloaddition of phosphinidene complexes with alkyne. However, their intramolecular reactions have never been reported. The 7-phosphanorbornadiene was heated at 120°C in boiling toluene to generate phosphinidene. The intramolecular reaction of phosphinidene complexes with alkenyl generated the annellated phospholes with a P-H function directly in a relatively good yield. This final compound was charatrized by X-ray crystal analysis. This method provides a new and efficient strategy to synthesize annellated phospholes.