In organic chemistry, a biphenol refers to compounds with the formula (C6H4OH)2. Such compounds formally result from the coupling of two phenols. All are colorless solids with the formula . Three symmetrical isomers of biphenol exist: Name Registry number PubChem Melting point (°C) 2,2'-Biphenol 1806-29-7 109 3,3'-Biphenol 612-76-0 124.8 4,4'-Biphenol 92-88-6 283
Additionally, three unsymmetrical isomers of biphenols exist Name Registry number PubChem Melting point (°C) 2,3'-Biphenol 31835-45-7 2,4'-Biphenol 611-62-1 162–163 3,4'-Biphenol 18855-13-5 190