Terephthalic acid Terephthalic acid Terephthalic acid is an organic compound with formula CH(COH). This white solid is a commodity chemical, used principally as a precursor to the polyester PET, used to make clothing and plastic bottles. Several million tonnes are produced annually. The common name is derived from the turpentine-producing tree "Pistacia terebinthus" and phthalic acid. Terephthalic acid was first isolated (from turpentine) by the French chemist Amédée Cailliot (1805–1884) in 1846. Terephthalic acid became industrially important after World War II. Terephthalic acid was produced by oxidation of "p"-xylene with dilute nitric acid. Air oxidation of "p"-xylene gives "p"-toluic acid, which resists
Quercitannic acid (CHO). For him, it was not a glycoside. In Allen’s "Commercial Organic Analysis", published in 1912, the formula given was CHO. Other authors gave other molecular formulas like CHO, while another formula found is CHO. According to Lowe, two forms of the principle exist – one soluble in water, of the formula CHO, and the other scarcely soluble, CHO. Both are changed by the loss of water into oak red, CHO. Quercitannic acid was for a time a standard used to assess the phenolic content in spices, given as "quercitannic acid equivalent". Quercitannic acid Quercitannic acid is one of the