10.1134/S1070428018110180
The study focuses on the synthesis of 1-, 2-methoxy-, 1,3-dimethoxyadamantanes, and 1-, 4-methoxydiadamantanes using adamantyl and diadamantyl halides reacted with dimethyl carbonate in the presence of zeolite catalysts, specifically NiHY or FeHY. These catalysts, free of binders, are promoted by iron and nickel compounds and are crucial for the selective synthesis of methoxyadamantanoids. The study optimizes the ratio of catalysts and reagents and develops reaction conditions for high yield and selectivity. The chemicals involved include adamantyl and diadamantyl halides as starting materials, dimethyl carbonate as both a reagent and solvent, and zeolite catalysts (NiHY and FeHY) to facilitate the reactions. The synthesized compounds exhibit high thermal stability, resistance to light and hydrolysis, and antimicrobial properties, making them valuable additives for improving the oxidative resistance and rheological characteristics of lubricating oils and fluids.
10.1080/15533174.2016.1212242
The study presents an efficient method for the synthesis of azlactone derivatives using zeolite NaY as a reusable heterogeneous catalyst under microwave irradiation and solvent-free conditions. Azlactones are compounds with significant biological and pharmaceutical properties, used as building blocks for various biologically active molecules. The chemicals used in the study include aromatic aldehydes, heterocyclic aldehydes, cyclic ketones, hippuric acid, and acetic anhydride (Ac2O). These reactants serve to form the azlactone derivatives through a condensation reaction. The purpose of using zeolite NaY is to catalyze this reaction, offering advantages such as good yields, short reaction times, simple work-up, and catalyst reusability, making the process mild and eco-friendly.
10.1016/j.jcat.2004.12.021
The research investigates the acylation of six aromatic substrates with varying characteristics using acetic anhydride over a H-BEA zeolite catalyst in a batch reactor at 373 K with nitrobenzene as the solvent. The study aims to evaluate the influence of the substrate's ring activation degree on the acetylation rate and the catalyst's stability. The results indicate that the reactivity is significantly dependent on the degree of ring activation, with electronic factors playing a more crucial role than diffusion limitations. The study concludes that acidic zeolites, particularly H-BEA, are a viable alternative to traditional Friedel-Crafts catalysts for acetylation of highly activated and polar aromatic substrates.
