Simple and clean synthesis of 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene from the aromatic alkylation of phenoxyethanol with fluoren-9-one catalysed by titanium cation-exchanged montmorillonite

9,9-Bis[4-(2-hydroxyethoxy)phenyl]fluorene is simply obtained by the condensation of phenoxyethanol with fluoren-9-one using a Ti4+ cation-exchanged montmorillonite as a strong solid acid catalyst.