Magnetic iron oxide/phenylsulfonic acid: A novel, efficient and recoverable nanocatalyst for green synthesis of tetrahydrobenzo[b]pyrans under ultrasonic conditions

Magnetic nanoporous MCM‐41 supported ionic liquid/palladium complex: An efficient nanocatalyst with high recoverability

“…This analysis was carried out in a temperature range of 0-800°Celsius. [57] This confirms the high stability of magnetic cores during the catalyst preparation process. In the final stage, the weight loss at temperature range of 251-700°C was due to the decomposition and elimination of organic The presence of magnetic nanoparticles in the Fe 3 O 4 @MCM-41@IL/Pd was investigated by wide-angle powder X-ray diffraction (PXRD) analysis (Figure 7).…”

“…85-1436). [57] This confirms the high stability of magnetic cores during the catalyst preparation process.…”

“…According to aforementioned subjects, in continuous of our recent studies and due to the importance of supported catalytic systems in chemical processes, [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] herein for the first time a novel magnetic mesoporous MCM-41 type silica supported ionic liquid/palladium complex [Fe 3 O 4 @MCM@IL/Pd] with core-shell structure has been designed, prepared and characterized and its catalytic application was developed in the one-pot synthesis of pyrano [2,3-d]pyrimidine derivatives under green conditions (Scheme 1).…”

SO3H‐functionalized nano‐MGO‐D‐NH2: Synthesis, characterization and application for one‐pot synthesis of pyrano[2,3‐d]pyrimidinone and tetrahydrobenzo[b]pyran derivatives in aqueous media

“…A modest decrease in the catalytic activity as shown in Figure 5 after six runs was evident by the percentage yields of each recycle. These results indicate the reusability of MGO-D-NH-(CH 2 ) 4 -SO 3 H. [69] 120 96 H 2 PO 4 -SCMNPs/solvent-free, 80°C [70] 20 92 Fe 3 O 4 @Ph-SO 3 H/H 2 O/r.t./ultrasonic condition [71] 25 95 MGO-D-NH-(CH 2 ) 4 -SO 3 H/H 2 O-EtOH (4:1), r.t. (this work) 5 95…”

Ni0.5Zn0.5Fe2O4@HA-PRS nanoparticle: A recoverable green catalyst for the synthesis of tetrahydrobenzo[b]pyrans in water

“…One of the main approaches for synthesizing tetrahydrobenzo[b]pyrans is one-pot condensation of an aldehyde, dimedone and malononitrile. Most of these methods employ various catalysts such as NH 4 Al(SO 4 ) 2 [23], magnetic Fe 3 O 4 /phenylsulfonic acid [24], magnetite-dihydrogen phosphate [25], ionic liquid [26,27], magnetite supported heteropoly acid [28], mixed metal nano-oxides [29], molecular iodine [30], Ru(II) complexes [31], copper oxide nanoparticles [32], lithium bromide [33], sodium selenate [34], HPA-dendrimer functionalized magnetic nanoparticle [35], and nano α-Al 2 O 3 supported ammonium dihydrogen phosphate [36]. However, despite these procedures are relatively useful, most of the methods encounter some limitations, such as expensive catalysts, long reaction times, toxic organic solvents and harsh reaction conditions.…”