Pyromellitic diamide–diacid bridged mesoporous organosilica nanospheres with controllable morphologies: a novel PMO for the facile and expeditious synthesis of imidazole derivatives

Abstract

Novel pyromellitic diamide–diacid bridged mesoporous organosilica nanospheres with controllable morphologies and acidic centers were designed and prepared through a convenient method by altering the addition sequence of precursors, solvent, and aging time.

Sulfamic acid grafted to cross-linked chitosan by dendritic units: a bio-based, highly efficient and heterogeneous organocatalyst for green synthesis of 2,3-dihydroquinazoline derivatives

“…Compared to homogeneous catalytic systems, heterogeneous ones are much more efficient for multiple and continous use in the chemical synthesis. [65][66][67] Indeed, heterogeneous catalyst systems benet from easy removal, recovery and recycling of the catalyst compared to homogeneous catalysts. 68 Therefore, chitosan application as a new support material for heterogeneous catalysis is increasing.…”

Synthesis of (E)-2-(1H-tetrazole-5-yl)-3-phenylacrylenenitrile derivatives catalyzed by new ZnO nanoparticles embedded in a thermally stable magnetic periodic mesoporous organosilica under green conditions

“…On the other hand, PMOs demonstrate other distinguishing characteristics such as large and hollow spaces, high surface area, regular cavity wall structure, low density and good membrane permeability, and material loading in large quantities. Therefore, PMOs have been effectively used in many applications such as drug and gene delivery, gas and molecule absorption, sensors, active agents for smart anticorrosive organic coatings, and catalysis 85 , 86 , 89 – 107 .…”

Supported copper on a diamide–diacid-bridged PMO: an efficient hybrid catalyst for the cascade oxidation of benzyl alcohols/Knoevenagel condensation

“…Nanostructured mesoporous materials have features such as high specic surface area, regular pore channels, high permeability, large pore volume, and high tolerability. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] By controlling the assembly or growth processes, different types of products with various structures, morphologies, or particle sizes can be produced. 12,13,[15][16][17][18][19][20][21] Periodic mesoporous organosilicas (PMOs) were rst reported in 1999 by Inagaki, 22 Ozin, 23 and Stein.…”