SEARCH Articles Figures Tables Chalcogen-Nitrogen Rings Containing Phosphorus(III) or Other p-Block Elements Compounds of Aromatic Ring Systems E. O. Fischer and H. P. Fritz Handbook of Ring-Opening Polymerization. Edited by P. Dubois, O. Coulembier, and J.-M. Raquez Linear polymers with p-phenylene groups and other ring structures P ring-opening P-Lactone ring P-Phenylene rings P-ionone ring P-lactam ring P—N Rings Ring Compounds with P and Ring Compounds with P, Se and C Atoms Ring Compounds with P, Se and N Atoms Ring-flip motion of poly(p-phenylene vinylene) Saturated Rings with Two or More P Atoms