Preyssler heteropolyacid [NaP5W30O110]14−, as a new, green and recyclable catalyst for the synthesis of [1,2,4]triazino[4,3-b][1,2,4,5]tetrazines

Heteropolyacids Anchored on Amino-Functionalized MCM-41 via Condensation as Reusable Catalysts for Esterification

“…with Acetic Acid [11][12][13][14], their catalytic activities were very similar to P-dN-M and K-dN-M due to the same HPAs loading and acid strength. These observations allow drawing that the catalyst activity generally corresponds to its acid strength and number (or HPA loading), rather than its surface area.…”

“…The Keggin type heteropolyacid H 3 PW 12 O 40 (PW) has been widely used in acid-catalyzed and redox reaction processes as highly active catalysts, and usually applied in fundamental studies as a model catalytic material [5,6]. Comparatively, Preyssler structured heteropolyacid H 14 NaP 5 W 30 O 120 has been largely overlooked, but its large number of balanced protons, strong acidity, high hydrothermal stability and wide pH range stability in solution bring about much research interest in recent years [7][8][9][10][11][12][13]. For example, the Preyssler heteropolyacid has been revealed to be an efficient catalyst for liquid phase esterification and alkylation reactions [14,15].…”

An Efficient One-pot Three-component Synthesis of Pyrido[2,3-d]pyrimidine Derivatives in the Presence of Nano Silica-supported Preyssler H14[NaP5W30O110]/SiO2 as a Green and Reusable Catalyst

“…Among the solid heteropolyacids, Preyssler with 14 acidic protons and unique hydrolytic stability is an e cient and e ective supper acid catalyst for organic reactions [16][17][18]. Also, immobilization of Preyssler on the appropriate nano-SiO 2 support can develop its catalytic properties by enhancing the speci c surface area of the catalyst [16].…”

Synthesis of Isobenzofuran-1(3H)-ones with the Aid of Silica-Supported Preyssler Nanoparticles

“…On the other hand, they are economically and environmentally attractive in both academic and industrial settings as useful acids and=or oxidation catalysts in various organic reactions because their catalytic features can be controlled at a molecular level. [9] In continuation of our efforts to explore the catalytic utility of heteropolyacid supported on silica gel, [10][11][12] herein we report for the first time a direct and efficient method for the preparation of substituted isobenzofuran-1(3H)-ones from the reaction of phthalaldehydic acid, substituted acetophenones, and cyclic ketones using silica-supported Preyssler nanoparticles as a novel and efficient catalytic system (Scheme 1).…”