The
bisphenols (pronounced ) are a group of chemical compounds with two hydroxyphenyl functionalities. Most of them are based on
diphenylmethane. The exceptions are bisphenol S, P, and M. "Bisphenol" is a common name; the letter following refers to one of the reactants.
Bisphenol A is the most popular representative of this group, often simply called "bisphenol."