Fe3O4-supported N-pyridin-4-amine-grafted graphene oxide as efficient and magnetically separable novel nanocatalyst for green synthesis of 4H-chromenes and dihydropyrano[2,3-c]pyrazole derivatives in water

Sulfonic acid‐functionalized Fe3O4‐supported magnetized graphene oxide quantum dots: A novel organic‐inorganic nanocomposite as an efficient and recyclable nanocatalyst for the synthesis of dihydropyrano[2,3‐c]pyrazole and 4H‐chromene derivatives

“…Also, the presence of SO 3 group was confirmed by the peak at 1221 cm −1 . [ 10,45 ] In addition, the peaks at 2920 and 2850 cm −1 in Figure 1c are assigned to CH stretching vibrations of the propyl group attached to the sulfonic acid group. In the spectrum of Fe 3 O 4 @GOQD‐ O ‐(propane‐1‐sulfonic acid), the absorption bands observed at around 620 and 485 cm −1 are related to the FeO stretching vibrations.…”

“…[ 8 ] As a result, MNPs have found wide applications in catalytic organic reactions and industrial processes. [ 9,10 ] In this context, Fe 3 O 4 and Fe 2 O 3 NPs are the most extensively studied core magnetic supports, owing to their high surface area with high catalyst loading ability, magnetic susceptibility, conductivity, striking stability and catalytic activity. [ 11 ]…”

Synthesis of pyrano[2,3‐c]pyrazoles: A review

“…[ 1 ] Their work was extended by many scientists and several reports on the synthesis of pyranopyrazole derivatives have been published. [ 2–6 ]…”

Heterogenized magnetic graphene oxide‐supported N6‐Schiff base Cu (II) complex as an exclusive nanocatalyst for synthesis of new pyrido[2,3‐d]pyrimidine‐7‐carbonitrile derivatives

“…In recent years, the search for extension of new and effective synthetic approaches toward the preparation of various biologically active heterocyclic compounds has been motivated on highly active and reusable catalysts under eco‐friendly conditions. [ 61–64 ] In this regard, and as our ongoing research program directed on the preparation and application of new and reusable magnetic nanoparticles as catalysts, [ 65–73 ] herein we wish to report the coating of Cu (II) N 6 ‐Schiff base complex on the surface of Fe 3 O 4 ‐magnetized graphene oxide nanosheets as a new support in order to prepare GO/Fe 3 O 4 @SPNC nanoparticles as a novel catalyst. The catalytic activity of this magnetically GO/Fe 3 O 4 ‐supported Cu (II) Schiff base complex was explored as an efficient, recyclable and sustainable catalyst in the synthesis of new pyrido[2,3‐ d ]pyrimidine‐7‐carbonitrile derivatives (Scheme 1).…”