Partial Ring-Opening and Rearrangement Reactions of P,C-Cages to Yield Unusual Phosphinous Acids Stabilized by Pentacarbonyltungsten

First reactions of polycyclic phosphirane complexes 3a−c are reported that include lithium hydroxide induced partial ring-opening and rearrangement reactions to give new tricyclic phosphinous acid complexes 4−7 as final products. Besides multinuclear NMR and IR spectroscopy and mass spectrometry, the molecular structures of complexes 4−6 were established by single-crystal X-ray crystallography.