C-alkylation reactions catalyzed by silica-supported Keggin heteropolyacids

Silica supported heteropolyacid catalyzed dehydration of aldoximes to nitriles and alcohols to alkenes

“…Supported HPA has proven to be the efficient catalysts for several organic transformations such as C-alkylation (25), esterification (26), Ritter reaction (27), Bigenelli reaction (28), and DakinÁWest reaction (29). Our group has also explored the catalytic activity of HPA for various other transformations (30,31).…”

Gasoline desulfurization by catalytic alkylation over silica-supported heteropolyacids: From model reaction to real feed conversion

“…For this study, we worked with acidic solids, already used in several acid-catalyzed reactions, such as the H-Beta zeolites [6] and the MCM-22 [7,8]. We have also investigated the supported heteropolyacids, used for many heterogeneous reactions like Friedel-Crafts acylation [9], alkylation of aromatics [10,11] and isoparaffins [12,13] or esterification [14] and which are well known to possess Brønsted acidity. …”

Valorization of Different Wastes and Their Use for the Design of Multifunctional Eco-catalysts

“…The influence of different heteropolycompounds with Keggin-type structure and their pyridine salts on the oxidation of alcohols with hydrogen peroxide has been investigated [14]. There is a large number of examples that illustrate the importance of the use of HPAs in catalytic processes, such as the synthesis of coumarins [15,16], synthesis of flavones [17,18], synthesis of imidazoles [19,20], and C-alkylations [21,22].…”