Synthesis of a wide range of biologically important spiropyrans and spiroacenaphthylenes, using NiFe2O4@SiO2@Melamine magnetic nanoparticles as an efficient, green and reusable nanocatalyst

DFT Studies on the Molecular Structure, Regioisomerism, Ground and Excited state Charge Transfer Properties of Spiro‐heterocycles

“…The difference in the environment of spiro carbon atoms in both the models can be identified from the stretching frequencies of Cs−C4 (1297 cm −1 in M1 and 1315 cm −1 in M2) Cs−N1 bonds (1359 cm −1 and 1365 cm −1 ) given in table 2. The computed frequencies have been compared with that of experimental values as obtained for M1 (Table 2) which is in good agreement [37,38,15,39] …”

“…The computed frequencies have been compared with that of experimental values as obtained for M1 (Table 2) which is in good agreement. [37,38,15,39] However, the substitution with electron-donating and withdrawing substituents is not found to profoundly affect the structural parameters much other than the obvious change in…”

Green Synthesis of Metal and Metal Oxide Nanoparticles: Principles of Green Chemistry and Raw Materials

“…Spinel ferrites have attracted much attention due to their thermal and chemical resistance [149][150][151][152][153][154]. Nickel ferrite (NiFe 2 O 4 ) is a major representative of spinel ferrites with the inverse spinel structure, which demonstrates ferromagnetism, originating from the magnetic moment of the antiparallel spins of metal ions (Ni 2+ and Fe 3+ ) [155]. Udhaya et al [156] developed a simple auto-combustion method using albumen for the synthesis of nanocrystalline nickel ferrite (NiFe 2 O 4 ).…”

A nickel nanoparticle engineered CoFe2O4@GO–Kryptofix 22 composite: a green and retrievable catalytic system for the synthesis of 1,4-benzodiazepines in water

“…The development of green methods with high catalytic activity systems has received a great deal of research attention in organic synthesis for environmental and economic reasons. [1][2][3][4][5] The aim of the eld of catalysis in terms of green chemistry is to develop environmentally benign, practical, clean, economical and efficient processes for catalyst separation and recycling. To achieve these goals, graphene oxide (GO) has been widely explored to replace conventional catalysts or use as supporting material for improving the performance of catalysts due to its large specic surface area, unique layered structure, high thermal stability, intrinsic mechanical, electrical properties, and excellent exibility.…”