Footprint Catalysis. IV. Structural Effects of Templates on Catalytic Behavior of Imprinted Footprint Cavities
作者:Toyoshi Shimada、Kiyoko Nakanishi、Kensaku Morihara
DOI:10.1246/bcsj.65.954
日期:1992.4
Footprint catalysts are silica(alumina)gel catalysts with tailored specificities. Their catalytic sites are “molecular footprint-like” cavities formed by a molecular imprinting procedure with templates, which are referred to as transition-state or reactive-intermediate analogs of the catalyzed reactions. To clarify the relationship between the structural feature of template molecules and catalytic behavior, seven footprint catalysts were prepared by imprinting with templates of several types closely related to the substrates, benzoic anhydride and acetic anhydride; their catalytic activity and thermodynamic parameters for 2,4-dinitrophenolysis were then estimated. Among these catalysts, a catalyst imprinted with N,N′-dibenzoylbenzenephosphonediamide, a tetrahedral intermediate analog for benzoic anhydride substrate, showed a 10-fold higher catalytic activity than did the other imprinted catalysts.
足迹催化剂是具有定制特异性的二氧化硅(氧化铝)凝胶催化剂。它们的催化位点是通过分子印迹程序用模板形成的 "分子足迹状 "空腔,这些模板被称为被催化反应的过渡态或反应中间体类似物。为了弄清模板分子结构特征与催化行为之间的关系,我们用与底物苯甲酸酐和醋酸酐密切相关的几种模板印迹法制备了七种足迹催化剂,然后估算了它们对 2,4-二硝基酚解反应的催化活性和热力学参数。在这些催化剂中,用苯甲酸酐底物的四面体中间体类似物 N,N′-二苯甲酰苯膦二酰胺印迹的催化剂的催化活性比其他印迹催化剂高 10 倍。