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Abstract

The cover image is based on the Full Paper Immobilization of nickel on Kryptofix 222 modified Fe3O4@PEG core‐shell nanosphere for the clean synthesis of 2‐Aryl‐2,3‐dihydroquinazolin‐4(1H)‐ones by Akram Taghizadeh et al., https://doi.org/10.1002/aoc.6787.

Copper‐kryptofix‐21‐Fe3O4/MCM‐41: A powerfully recoverable nanocatalyst for clean regioselective 1,2,3‐triazole synthesis‐click reactio n

“…Finally, the resulting product was recrystallized from methanol: acetonitrile (1:1), afforded triazolic compounds (3a-3m) with excellent yields. The obtained products were subjected to analysis using FT-IR, 1 H, and 13 C NMR, spectrophotometers, and were found to be consistent with previously reported cases (refer to Supporting data).…”

“…Magnetic measurements were conducted using a vibrating sample Magnetometer VSM under magnetic fields up to 20 kOe and at room temperature (Daghigh Meghnatis Kavir Co., Mahabad, Iran). Spectral data of 1 H (300) and 13 C NMR (75 MHz) were acquired using a BRUKER NMR instrument at Urmia University (Urmia, Iran). Thin-layer chromatography (TLC) was utilized for monitoring the reaction on silica gel plates coated with SIL G/UV 254 .…”

“…[4][5][6][7][8] Metallic nanocatalysts, which offer very high surface areas, have gained importance as dynamic catalysts for various organic conversions, showing their effectiveness in catalytic performances. [9][10][11][12][13] However, recovering the nanocatalysts from reaction mixtures through filtration and centrifugation poses challenges, resulting in the unavoidable loss of catalyst during the separation process and hindering their widespread practical applications. [14][15][16] These obstacles can be overcome by employing magnetic nanoparticles as catalyst supports or using a conventional Dr. Kh.…”

“…17 Magnetite (Fe 3 O 4 ) is particularly favored as a nanoparticle due to its excellent magnetic properties, ease of preparation, simple separation, stability, surface functionalization potential, affordability, low toxicity, and more. [18][19][20][21][22][23] Given the advantageous properties of silica or carbon-coated Fe 3 O 4 nanoparticles, the establishment of effective synthetic approaches to fabricate coreshell MNPs Fe 3 O 4 /MCM-41, with Fe 3 O 4 as the core and silica MCM-41 as the shell, would possess considerable importance. [24][25][26][27] Crown ethers are cyclic compounds that have oxygen, sulfur, and/or nitrogen atoms as donors.…”

“…Its exceptional properties, such as a large surface area (up to 1,000 m 2 .g −1 ), uniform pore size, narrow pore size distribution, and the ability to adjust pore diameter between 2 and 10 nm, enable it to exhibit high thermal stability and find applications in catalysis, isolation, photocatalysis, sensors, absorption, and more 4–8 . Metallic nanocatalysts, which offer very high surface areas, have gained importance as dynamic catalysts for various organic conversions, showing their effectiveness in catalytic performances 9–13 . However, recovering the nanocatalysts from reaction mixtures through filtration and centrifugation poses challenges, resulting in the unavoidable loss of catalyst during the separation process and hindering their widespread practical applications 14–16 .…”