Silver nanoparticles immobilized onto poly(4‐vinylpyridine)‐functionalized magnetic nanoparticles: A robust magnetically recyclable catalyst for oxidant‐free alcohol dehydrogenation

Abstract

A heterogeneous and recyclable catalyst with a high loading of silver nanoparticles was synthesized via the silver nanoparticles being supported onto the surface of magnetic nanoparticles coated with poly(4‐vinylpyridine). The synthesized catalyst was used in the dehydrogenation of alcohols to corresponding carbonyl compounds. A broad diversity of alcohols was converted into their corresponding carbonyl compounds in excellent yields. The catalyst was easily recovered by applying an external magnetic field and reused for seven reaction cycles without considerable loss of activity. The catalyst was fully characterized using various techniques.

Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

“…Another example of grafting of the P4VP brush was reported by Bayat et al 78 The authors synthesized Ag NPs stabilized by P4VP on the surface of magnetic NPs using multiple modification steps such as the formation of Fe 3 O 4 NPs, coating with silica, functionalization with thiol groups, grafting of P4VP, coordinating a Ag compound, and reduction with NaBH 4 . The catalyst showed excellent properties in dehydrogenation of various alcohols to corresponding carbonyl compounds with high conversion, selectivity, and exceptionally high TOF, but it is unclear whether a multistep procedure of the catalyst fabrication could be simplified to achieve the same enhancement of the catalytic performance and reusability.…”

One‐pot oxidant‐free dehydrogenation‐Knoevenagel tandem reaction catalyzed by a recyclable magnetic base‐metal bifunctional catalyst

“…In addition, the catalytic activity of NH-Pd(0)@MNP was compared with other catalysts in the dehydrogenation condensation of benzyl alcohol reported in literature. [2,8,9,[22][23][24][25][26][27] Base was needed when Ag/ZnO and PVP-Ru were used as catalysts (Table 2, entries 6, 7). Other catalysts required either longer time or higher temperature ( Table 2, entries 8-14).…”

“…Dehydrogenation of primary and secondary alcohols to carbonyl compounds is of great value in organic synthesis and the products are also versatile organic compounds. [1][2][3][4][5][6] The metal-based oxidants such as potassium permanganate, chromium reagents, osmium reagents, or ruthenium reagents are traditionally used in most of the oxidative dehydrogenations. However, these methods have the disadvantages of high cost, low selectivity and large amount of waste.…”

Magnetic Fe3O4@Ag nanoparticles catalyzed C–C cross‐coupling reaction of aromatic alcohols

“…It is found that as recyclable heterogeneous catalyst, silver-based nanoparticles have high conversion and selectivity in alcohol oxidation or crosscoupling. [19][20][21][22] In order to improve the catalytic ability and recyclability of silver catalysts, many materials (hydrogel, cellulose, carbon fibers, magnetic materials, etc.) have been developed to support Ag nanoparticles.…”