By usage, the methylenediphenols, $\ce{HOC6H4CH2C6H4OH}$, commonly $p,p$-methylenediphenol, and their substitution products (generally derived from condensation of two equivalent amounts of a
phenol with an
aldehyde or
ketone).
Source: PAC, 1995,
67, 1307. (
Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1323 [
Terms] [
Paper]