Fe₃O₄@BNPs‐CPTMS‐Chitosan‐Pd(0) as an Efficient and Stable Heterogeneous Magnetic Nanocatalyst for the Chemoselective Oxidation of Alcohols and Homoselective Synthesis of 5‐Subestituted 1H‐Tetrazoles

Abstract

In this content, a stable, efficient, active, reusable and inexpensive magnetic boehmite was synthesized by hydrothermal sol-gel method. In the next step magnetic boehmite immobilized further with palladium chitosan complex (Fe 3 O 4 @BNPs-CPTMS-Chitosan-Pd (0)). This novel nanocatalyst was used for the oxidation of alcohols in ethanol and the preparation of 5-substituted tetrazoles in solvent-free conditions. To confirm the structure of catalyst, a variety of techniques, including FT-IR, XRD, FESEM, TEM, EDX, mapping, VSM, TGA-DTA, BET, ICP and UV-Visible were used. The mol % of catalyst was obtained with ICP (2.8 mol%). Also, some benefits of the catalyst are: excellent magnetic properties, easy separating from the reaction mixture with the external magnet, the use of cheap and affordable materials, good surface area (55.94 m 2 /g), low palladium leaching from the catalyst surface, use the green ligand and the use of catalyst for at least 5 consecutive times without reducing the catalytic activity.

Nanomaterial catalyzed green synthesis of tetrazoles and its derivatives: a review on recent advancements

“…The Fe 3 O 4 @BNPs-CPTMS-chitosan-Pd(0) offered numerous advantages such as green ligand (Chitosan), thermal and mechanical stability, high-grade magnetic strength, high surface area, reusability (5 cycles), an easy and fast separation. 65 Akbarzadeh et al embedded chlorosulfonic acid functionalized carbon nanotubes on Fe 3 O 4 nanoparticles to produce 66 Similarly, it was found that, unmodied nano Fe 3 O 4 exhibited remarkable catalytic activity for 5-substituted tetrazole synthesis from malononitrile (1 mmol), aromatic aldehyde (1 mmol), sodium azide (1 mmol) as tabulated in Table 4, entry 4. They observed that nano Fe 3 O 4 gave best result at 20 mol% amount.…”

“…The Fe 3 O 4 @BNPs-CPTMS-chitosan-Pd(0) offered numerous advantages such as green ligand (Chitosan), thermal and mechanical stability, high-grade magnetic strength, high surface area, reusability (5 cycles), an easy and fast separation. 65 …”

Copper/Schiff‐base complex immobilized on amine functionalized silica mesoporous magnetic nanoparticles under solvent‐free condition: A facile and new avenue for the synthesis of thiazolidin‐4‐ones

“…This is in accordance with reported miller XRD. [55][56][57] The EDX analysis of the copper/Schiff base complex supported on amine-functionalized silica MMNPs is presented in Figure 4. Peaks for iron, oxygen, nitrogen, carbon, silica, and copper can be detected, confirming the presence of these elements in the structure of the nanoparticles.…”

La(OH)3 nanoparticles immobilized on Fe3O4@chitosan composites as novel magnetic nanocatalysts for sonochemical oxidation of benzyl alcohol to benzaldehyde

“…Among different oxidation reactions, oxidation of benzyl alcohols into the corresponding benzaldehydes is a prominent chemical transformation in organic chemistry. [1][2][3][4][5] Aldehydes, which have various applications in different elds such as pharmaceuticals, dyes, perfumes, agriculture, food, beverages, agribusiness industries, and chemicals, are used as valuable oxygen-containing intermediates and raw materials in organic chemistry. In the past, despite numerous available methods for selective oxidation processes, most of them were not without drawbacks, generating a lot of by-products and pollutants.…”