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.Alkyd resinRelated: It is a common aromatic acid component in alkyd resin backbones.PhenolphthaleinRelated: It is a starting material in the classic synthesis of phenolphthalein.Unsaturated polyester resinRelated: It is a common saturated component that tunes backbone properties.Phthalic acidBroader topic: Adjacent carboxyl groups can close into this five-membered anhydride ring when water is removed.