We wish to report the isolation of a monocyclic triarylalkoxy phosphorane possessing an apical PH bond, 10-P-5 species'3, and the anion formed from it by deprotonation, the 10-P-4 species phosphoranide 2. Although other monocyclic PH phosphoranes have been reported, 2 none have been reported as having an apical PH bond. We are not aware of other reports of a monocyclic
