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    STUDIA CHEMIA - Ediţia nr.2 din 2016  
         
  Articol:   SYNTHESIS OF UNSYMMETRICALLY SUBSTITUTED ISOXAZOLES AS INTERMEDIATES FOR BENT-CORE MESOGENS.

Autori:  GHEORGHE ROMAN. 		 
       
         
  Rezumat:   3,5-Disubstituted isoxazoles have been designed and synthesized to be used as central units for bent-core mesogens. The substituents at position 3 of the isoxazole ring are either hydroxymethyl or carboxyl, while alkenyl-terminated substituents have been inserted at position 5. A multi-step reaction sequence comprising the O-alkylation of 4-hydroxyacetophenone with the suitable alkenyl halide, the Claisen-type condensation with diethyl oxalate and the cyclization to isoxazole led to the isoxazole esters as key intermediates, which were subsequently reduced and hydrolyzed to the corresponding isoxazol-3-ylmethanols and isoxazole-3-carboxilic acids, respectively. Keywords: liquid crystals, bent-core, ring closure, isoxazole  
         
     
         
         
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