Synthesis of potential antioxidants by synergy of ultrasound and acidic graphene nanosheets as catalyst in water

Metal‐Free and Ultrasound‐Assisted C–C and O‐Si (O‐Protected) Bond Formation in Cyanosilylation of Aldehydes with TMSCN Catalyzed by Functionalized Graphene Oxide Derivatives

“…Also, the full details of preparation and characterization of the prepared catalysts are provided in supporting information of this paper. Previously, we have reported the synthesis of phenolic antioxidants using GO‐SO 3 H and RGO‐SO 3 H ,,–. In this study, all of the catalysts were tested in the cyanosilylation of aromatic aldehyde using TMSCN and we found that the cyanosilylation of aldehydes could be rapidly accomplished.…”

Preparation and Characterization of Ni‐Modified Graphene Oxide Complex as an Efficient Catalyst for the Synthesis of Sulfides via Reaction of Arylhalides with S8 or Thiourea

“…The results were confirmed by TGA analysis data by showing 6% weight loss before 130 °C for GO, which is caused by the release of trapped water between layers GO nanosheets. Also the weight loss (23%) between 130 °C and 212 °C is due to the decomposition of the labile oxygen‐containing functional groups (hydroxyl, carboxylic acid and epoxy) on the surface of GO nanosheets . In TGA curve of the GO‐N‐isatin‐Ni (II), a weight loss (8%) before 200 °C is due to the trapped water and also a weight loss about 20% from 250 to 700 °C attributed to the decomposition of immobilized organic spaces on the GO nanosheets surface.…”

“…GO used in various fields of biological, optical, electrical, thermal and mechanical . The key advantages of GO are high specific surface area, high surface‐to‐volume ratio and chemical stability . Graphene oxide, prepared by complete oxidation of graphite, contains various functional groups such as epoxy, hydroxyl, carbonyl, and carboxyl groups …”

Magnetization of graphene oxide nanosheets using nickel magnetic nanoparticles as a novel support for the fabrication of copper as a practical, selective, and reusable nanocatalyst in C–C and C–O coupling reactions

“…48,49 The second weight loss, which is about 18%, is observed between 100 and 250 C, which is attributed to the decomposition of thermally less stable and labile oxygencontaining functional groups (hydroxyl, epoxy, and carboxylic acid). 21,50 The third weight loss at about 300 C corresponds to the more stable oxygen-containing functionalities and the bulk pyrolysis of the carbon skeleton. 51,52 The fourth weight loss, which shows a major decrease in the mass of about 31% in the temperature range of 250-450 C, is attributed to the decomposition of supported organic moieties and the copper complex on the surface if GO-Ni MNPs, 21,31 which can be possibly related to the strong chemical interaction between GO-Ni MNPs and the organic groups.…”