1. (a) Schmidpeter, A.; Karaghiosoff, K. InRings, Clusters andPolymers of Main Group and Transition Elements;Roesky, H. W., Ed.; Elsevier: Amsterdam, 1989; p 307.
2. (b) Schmidpeter, A.; Karaghiosoff, K. InMultiple Bonds and Low Coordination in Phosphorus Chemistry; Regitz, M.; Scherer, O. J., Eds.; Thieme: Stuttgart, 1990; p 258.
3. Anellated heterophospholes