Intramolecular [4+2] Diels-Alder Cycloaddition of a 2H-Phosphole to Coordinated Unsaturated Phosphines, Phospholes, and an Arsine

摘要

The coordinated DMPP undergoes a [1,5] phenyl migration at about 145 deg C prior to or concomitant with the [4+2] intramolecular cycloaddition reaction with the alkene moiety of the dienophile to produce a new class of conformationally rigid bidentate ligands containing the 1-phosphanorbornene bicyclic ring system. The characteristic ~1H, ~13C{~1H}, and ~13P{~1H} NMR spectroscopic features of these compounds are described. Crystal structures of most of the new compounds are reported.