Covalently bonded sulfonic acid magnetic graphene oxide: Fe3O4@GO-Pr-SO3H as a powerful hybrid catalyst for synthesis of indazolophthalazinetriones

Phosphomolybdic acid supported on Schiff base functionalized graphene oxide nanosheets: Preparation, characterization, and first catalytic application in the multi‐component synthesis of tetrahydrobenzo[a]xanthene‐11‐ones

“…The presence of hydrophilic oxygen containing groups on the surface of GO nanosheets such as hydroxyl, epoxy, and carboxyl groups makes surface modification of GO further efficiently and allow construction of various novel functional groups attached at the GO surface . Functionalized GO‐based materials are attractive for various application areas such as solar cells, adsorption of organic dye, and also serve as efficient heterogeneous catalysts in various chemical transformations such as oxidation of olefins, synthesis of N‐aryl‐2‐amino‐1,6‐naphthyridines, and synthesis of indazolophthalazinetriones . There are a number of methods developed for functionalization of GO including amidation reaction between the carboxylic acid group of GO and amine, esterification reaction between the carboxylic acid group of GO and alcohols, reaction between the hydroxyl and carboxyl groups of GO and isocyanates, and many others.…”

“…[13][14][15] Functionalized GObased materials are attractive for various application areas such as solar cells, [16] adsorption of organic dye, [17] and also serve as efficient heterogeneous catalysts in various chemical transformations such as oxidation of olefins, [18] synthesis of N-aryl-2-amino-1,6-naphthyridines, [19] and synthesis of indazolophthalazinetriones. [20] There are a number of methods developed for functionalization of GO including amidation reaction between the carboxylic acid group of GO and amine, [21] esterification reaction between the carboxylic acid group of GO and alcohols, [22] reaction between the hydroxyl and carboxyl groups of GO and isocyanates, [23] and many others. Silylation of the hydroxyl groups of GO using 3-aminopropyltriethoxysilane (APTS), as a silane coupling agent, is another method to covalently modify the surface of GO.…”

Fe3O4‐supported Schiff‐base copper (II) complex: A valuable heterogeneous nanocatalyst for one‐pot synthesis of new pyrano[2,3‐b]pyridine‐3‐carboxamide derivatives

“…[11][12][13][14][15][16] Among these NPs, nanometal oxides such as Fe 2 O 3 , Fe 3 O 4 , TiO 2 , Al 2 O 3 , ZnO, etc. [18][19][20][21][22][23][24][25][26][27] Magnetic nanoparticles (MNPs) have recently received considerable attention both as solid support materials for a variety of homogeneous catalysts and as nanocatalysts in organic synthesis owing to their numerous benefits such as high stability, facile separation by external magnetic field, easy preparation and functionalization, and environmental benignity, as well as high surface area providing highly active sites on the particle surface and high loading capacity. [17] However, these nanoparticles suffer from difficult separation from the reaction mixtures by conventional separation methods such as filtration due to their nanometer scale (especially below 100 nm).…”

Mo (CO)6‐assisted Pd‐supported magnetic graphene oxide‐catalyzed carbonylation‐cyclization as an efficient way for the synthesis of 4(3H)‐quinazolinones

“…Regarding the great advantages of palladium in catalytic transformations, several efforts have been focused on immobilization of this metal on nanoparticles, which results in higher activity and easier recovery of the catalyst . Among several nanoparticles that are used as support, magnetic graphene oxide (MGO) is an appropriate choice because of various benefits, including high surface area, functionalization ability, high stability, and magnetic properties …”