Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. XYlenol or dimethylphenol is an arene compound with two methyl groups and a hydroxyl group. 6 isomers exist of xylenol of which 2,6-xylenol with both methyl group in an ortho position with respect to the hydroxyl group is the most important. THe name xylenol is a contraction of two similar compounds xylene and phenol. TOgether with cresols and cresylic acid, xylenols are an important class of phenolics with great industrial importance. XYlenols are used as pesticides and used in the manufacture of antioxidants. XYlenol orange is a redox indicator built on a xylenol skeleton. 2,6-xylenol is a monomer for Poly(p-phenylene oxide) engineering resins through carbon - oxygen oxidative coupling. Carbon to carbon dimerization is also possible. IN one study 2,6-xylenol is oxidized with iodosobenzene diacetate with an 5 fold excess of the phenol.