KnowraPhthalic anhydrideLinked fromLinked fromThe 5 pages that link to Phthalic anhydride, each with the reason it gives.All 5Broader topic 2Related 3NaphthaleneBroader topic: Air oxidation of naphthalene is an industrial route to this chemical intermediate.Phthalic acidBroader topic: Adjacent carboxyl groups can close into this five-membered anhydride ring when water is removed.