“…PC helps to establish the number of hydroxyl groups in phenols (1977). It is extensively used for the analysis of antioxidants (616,1596,1601,1821), isomeric monosubstituted phenols (702,1051), chlorinated phenols (846,2132), nitrophenols (1289), methylol derivatives (2183), alkylated hydroquinones (1595), dimethyl ethers of pyrogallol (1101), photographic developers (193), phenylphenols (701, 2131), hydroxybenzophenone derivatives (1319), eugenol and its isomers (1426), and bisphenol A (1657). Occasionally, phenols are coupled with diazonium salts prior to PC (164,1575).…”