Heterogenization of molybdenum complexes: Techniques and catalytic applications

Rana, Lata

doi:10.1016/j.apcata.2023.119227

Cited by 7 publications

(1 citation statement)

References 184 publications

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“…[8] Incorporating molybdenum complexes in polymeric matrices enhances the activity and selectivity of catalysts. [9] Such supported complexes are known for their ability to catalyze numerous organic transformations [10] such as olefin epoxidation, [11] oxidation of alcohols, [12] oxidative bromination of organic substrates, [13] oxygen atom transfer reactions, [14] polymerization of lactones, [15] multicomponent reactions [16] and many more. These types of complexes offer a promising way to improve the efficiency and sustainability of various organic reactions, making them a potential candidate for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Polymer Supported Nitrogen‐Bridged Symmetrical Binuclear Dioxidomolybdenum(VI) Complexes and Their Homogeneous Analogues as Potential Catalysts for Efficient Synthesis of 2‐Amino‐3‐Cyano‐4H‐Chromenes/Pyrans

Maurya,

Nandi,

Kumar

et al. 2024

Chemistry A European J

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Reaction of 2‐chloromethylbenzimidazole with known intermediates (i – iii), prepared from diaminoguanidine hydrochloride with salicylaldehyde, 5‐bromo‐salicylaldehyde or 3,5‐di‐tert‐butylsalicylaldehyde, led to the formation of benzimidazole appended new ligands, H4L1–H4L3 (I−III). The homogeneous nitrogen‐bridged symmetrical binuclear complexes, [(MoVIO2)2(L1)(H2O)2] (1), [(MoVIO2)2(L2)(H2O)2] (2) and [(MoVIO2)2(L3)(MeOH)2] (3) and mononuclear complexes, [MoVIO2(H2L1)(MeOH)] (4), [MoVIO2(H2L2)(H2O)] (5) and [MoVIO2(H2L3)(MeOH)] (6).have been isolated by reacting these ligands. The corresponding binuclear heterogeneous compounds [(MoVIO2)2(L1)(DMF)2]@PS (PS‐1), [(MoVIO2)2(L2)(DMF)2]@PS (PS‐2) and [(MoVIO2)2(L3)(DMF)2]@PS (PS‐3) have been obtained by immobilization of 1−3 onto chloromethylated polystyrene beads. All synthesized ligands, homogeneous as well as heterogeneous supported compounds have been characterized well. Heterogeneous compounds (PS‐1−PS‐3) have further been studied by microwave plasma atomic emission spectroscopy, X‐ray photoelectron spectroscopy, and field emission scanning electron microscopy along with energy dispersive spectroscopy. All compounds were explored for catalytic applications to one‐pot multicomponent reactions (MCRs) for efficient synthesis of biologically active 2‐amino‐3‐cyano‐4H‐chromenes/pyrans (21 examples). Optimizing various reaction parameters helped in achieving as high as 97% yields of products. Though, only half equivalent of the binuclear complexes (1‐3) was required compared to mononuclear analogues (4‐6) to achieve comparable yields, heterogeneous catalysts have an added advantage due to their stability and recyclability. Suitable reaction mechanism has also been proposed based on isolated intermediate(s).

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