Rapid synthesis of highly stable polymer-supported eosin Y for visible light-driven photoxidation of thioethers to sulfoxides and phenylboronic acids to phenols.

In recent past, magnetic catalyst has gained much attention because it can be easily separated from the reaction mixture. Herein we report a facile synthesis of magnetic carbon dot supported MnO 2 nanoparticles for the oxidative transformation of organic compounds. In the actual synthesis, initially Fe 3 O 4 nanoparticles were prepared by microwave assisted method and carbon dots were prepared instantaneously from glucose by simple incineration under closed condition. The synthesized carbon dots were coated over iron oxide nanoparticles via sonochemical deposition method. Further, magnetic carbon dot supported MnO 2 nanocomposite was synthesized by conventional homogeneous precipitation using potassium permanganate. The synthesized nanocomposite material was characterized using FT-IR, SEM, TEM, XRD and VSM techniques. The catalytic efficiency of the nanomaterial was successfully demonstrated for the oxidation of benzyl alcohols to benzaldehydes. The advantages of this method include, controlled oxidation of alcohols to aldehydes with broad substrate scope, the use of molecular oxygen as a green oxidant and beyond that a facile magnetic separation of the catalyst material. Moreover, the catalyst can be recycled for 5 times without much loss in its efficiency.

A facile one-pot green chemical conversion of aromatic aldehydes to alkyl esters is described using polymer-supported bromine chloride resin in the presence of potassium carbonate at room temperature. This eco-friendly methodology with simple workup procedure and recovery and recyclability of the resin makes the transformation simple and efficient.

A highly efficient KI‐TBHP mediated oxidative amidation of ethylarenes into primary, secondary and tertiary α‐ketoamides was developed at an ambient temperature. In addition, oxidative degradation of ethylarenes to primary aromatic amides using KI‐TBHP‐I2 was also demonstrated in an environmentally benign water medium. The merits of this transition metal free transformation includes 52–81% yield, inexpensive catalyst and substrate. The synthetic potential of the protocol was showcased by scale up reaction and functionalization of the α‐ketoamides.

Alkyl benzoates are prepared by a facile, green one‐pot esterification of benzaldehydes using bromine supported on Amberlite IRA‐400 chloride resin as reusable catalyst.