Adipic acid: Crude oil → benzene → cyclohexane → cyclohexanone + cyclohexanol → adipic acid Sebacic acid (decanedioic acid): Castor oil → ricinoleic acid → sebacic acid Dodecanedioic acid: Butadiene → Cyloclododecatriene → cyclododecane → (oxidation) → Dodecanedioic acid Terephthalic acid: Crude oil → p-xylene → terephthalic acid Isophthalic acid: Crude oil → m-xylene → isophthalic acid