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    STUDIA CHEMIA - Issue no. 3 / 2019  
         
  Article:   GREEN CATALYTIC SYNTHESIS OF PHENPROCOUMON.

Authors:  NATALIA CANDU, ANDRAS TOMPOS, EMILIA TALAS, MADALINA TUDORACHE, SIMONA M. COMAN. 		 
       
         
  Abstract:   The catalytic potential of triflate-based activated carbon composites has been investigated in phenprocoumon (C3-alkylated compound) synthesis, through the alkylation of 4-hydroxycoumarin with phenyl-ethyl-carbinol. The main reaction products are O- and C3-alkylated compounds. However, O-alkylated product is more easily produced to the detriment of the C3-alkylated compound, the selective synthesis of the last being a challenge in these conditions. Both the conversion of 4-hydroxycoumarin and the selectivity to C3-alkylated compound is highly influenced by the physico-chemical characteristics of the catalysts and the reaction conditions. The highest 4-hydroxycoumarin conversions (16.0-30.0%) and selectivity to phenprocoumon (94.0-99.7%) were achieved with triflate-based activated carbon composites, characterized by the existence of strong Brønsted acid sites, optimal Lewis/Brønsted acid ratio, and bimodal micro-/mesoporosity. 

Keywords: triflic acid; activated carbon, Friedel-Crafts alkylation, 4-hydroxycoumarin; phenprocoumon
 
         
     
         
         
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