مشخصات پژوهش

Development of heterogeneous catalysts for fine chemicals synthesis has become a major area of research. One of the major drawbacks of the homogeneous catalysts is the difficulty in separating the relatively expensive catalysts from the reaction mixture at the end of the process. Thus the use of reagents and catalysts on supporters has received significant attention.1 In continuation of our previously reported studies related of the synthesis of new silica supported catalysts for organic transformations, we propose a simple strategy to create Bronsted acid site on V=O supported silica. Herein, we prepared SVA according to our previously reported procedure2 and wish to used it as a heterogeneous and recyclable catalyst with dual ability in the synthesis of 4,4’-alkylmethylene-bis(3-methyl-5-pyrazolones)(Scheme 1)