22Biphenol

2,2'-Biphenol, also known as 2,2'-dihydroxybiphenyl or bis(2-hydroxyphenyl), is an organic compound with the chemical formula (C6H4OH)2. It is a derivative of biphenyl where hydroxyl groups are attached to the ortho positions of each phenyl ring. It is a white to off-white crystalline solid. The synthesis of 2,2'-biphenol can be achieved through various methods, including the Ullmann reaction or oxidative coupling of phenol. Its physical properties include a melting point of approximately 108-110 °C and it is sparingly soluble in water but more soluble in organic solvents like ethanol and ether.

2,2'-Biphenol is a valuable intermediate in the synthesis of more complex organic molecules. It is used in the production of polymers, pharmaceuticals, and ligands for catalysis. Its ability to form chelates with metal ions makes it useful in coordination chemistry. Due to the presence of the two hydroxyl groups in close proximity, it can act as a bidentate ligand. The compound finds application in the development of chiral catalysts, which are important for stereoselective synthesis in organic chemistry. Environmental and safety data are available, and it is handled with appropriate precautions.