A green method for solvent-free conversion of epoxides to thiiranes using NH₄SCN in the presence of NiFe₂O₄ and MgFe₂O₄ magnetic nanocatalysts

Preparation, characterization and application of MgFe2O4/Cu nanocomposite as a new magnetic catalyst for one-pot regioselective synthesis of β-thiol-1,4-disubstituted-1,2,3-triazoles

“…Fourier transform infra-red (FT-IR) spectrum. 51 The characteristic diffraction peaks of copper located at 2q ¼ 43.7 , 50.7 , and 74.3 which correspond to the (111), (200), and (220) planes of the fcc structure, respectively and they are in good agreement with copper standard (JCPDS: 04-0836). 57 The peaks at 43.…”

Preparation and characterization of magnetically separable MgFe2O4/Mg(OH)2 nanocomposite as an efficient heterogeneous catalyst for regioselective one‐pot synthesis of β‐chloroacetates from epoxides

“…A broad band at 1509 cm −1 is attributed to the O─ H bending vibrations in Mg(OH) 2 . The formation of tetrahedral–octahedral structures of the metal oxide (Fe─ O and Mg─ O) is confirmed by the absorption bands at around 400–600 cm −1 …”

“…Some of these procedures suffer from disadvantages such as high temperatures, long reaction times, the use of harmful reagents, low efficiency and regioselectivity, formation of by‐products, incapability of catalyst recycling and the risk of metal remaining in the obtained product in pharmaceutical synthesis. Therefore, in order to overcome these problems and in connection with our recent works on nanoferrites, we describe here a green and efficient method for the regioselective one‐pot synthesis of β‐chloroacetates from epoxides with nickel chloride and acetic anhydride in the presence of a catalytic amount of MgFe 2 O 4 /Mg(OH) 2 magnetic nanoparticles in ethanol solvent at room temperature.…”

The promoted synthesis of minoxidil by magnetic nanoparticles of cobalt ferrite(CoFe2O4) as a heterogeneous reusable catalyst

“…As a part of our research program on the synthesis of nanomagnetic materials and their application in functional group transformations [20][21][22], herein, we wish to introduce nanospinel ferrites as efficient and reusable heterogeneous catalysts for N -oxidation of 6-chloro-2,4-diaminopyrimidine to 2,6-diamino-4-chloropyrimidine N -oxide by H 2 O 2 in ethanol under reflux conditions. Then, through the nucleophilic reaction of piperidine with 2,6-diamino-4-chloro-pyrimidine N -oxide, minoxidil (2,4-diamino-6-piperidino-pyrimidine 3oxide) was produced in high yield and purity ( Figure 1).…”