Phosphorus pentachloride Phosphorus pentachloride Synonyms: Phosphorous Pentachloride; Phosphorus(V) chloride; PhosphorusVchloridewhitextl; PETACHLOROPHOSPHORANE; PHOSPHORUS CHLORIDE; PHOSPHORUS PENTACHLORIDE, POLYMER-BOUND; Fosforo(pentacloruro di); fosforo(pentaclorurodi); Fosforpentachloride CAS NO.: 10026-13-8 Formula: PCl5 Weight: 208.24