propyl , and butyl PCAs were prepared and copolymerized with styrene. 3,5-Difluorophenyl ethyl PCA is mentioned in Knoevenagel condensation catalytic studies related to ionic liquid covalently modified magnesium-aluminum hydrotalcite amphiphilic catalytic material ; in application of bicyclic pyridine derivatives as fatty acid binding protein inhibitors ; in synthesis and copolymerization with styrene . (2E)-3,5-Difluoro ethyl PCA is reported in a rhodium-catalyzed conjugate addition/cyclization cascade for the asymmetric synthesis of 2-amino-4H-chromenes , and in layered double hydroxide anchored ionic liquids catalysis for the Knoevenagel condensation reaction .