In this work, we fabricated a stimulusresponsive biopolymeric material and demonstrated the reversible character of a hydrophilic/hydrophobic interface upon exposure to UV light. Importantly, this stimulusresponsive material exhibited excellent features in an oil/ water separation system. Cellulose was functionalized on both sides of the surface with a dopamine polymer and further modified with an azobenzene-fluorosilane material. Azobenzene can alter the properties of a material via an isomerization effect (trans−cis) upon exposure to UV light. Initially, the azobenzene-fluorosilane material was in a hydrophobic state; the contact angle was over 130°; and absorption performance with various organic solvents showed there to be high levels of extractive activity and outstanding reusability. When we exposed the material to UV light, the surface changed to that of a hydrophilic nature, and this phenomenon was influenced by the azobenzene chemistry of folding and unfolding of an azobenzene-fluorosilane molecule. Significantly, this phenomenon is a reversible, reusable, and eco-friendly material. Furthermore, dopamine polymers could block organic material, bacteria, and fungi, and this surface can be used for wastewater purification. Therefore, we foresee that the stimulus-responsive surface of biopolymeric material could result in a different direction in the oil/water purification fields.

TMSOTf‐catalysed generation of 2,4,5‐trisubstituted imidazoles by a simple [3+2] addition reaction of azido chalcones and organic nitriles is described. This transformation generates two new C‐N bonds under mild reaction conditions. The substrate scope of the reaction is excellent with good number of vinyl azides and aromatic and aliphatic nitriles tolerating the reaction. It has been shown that the reaction can also be conducted under microwave condition successfully. These newly synthesized imidazoles are shown to exist as tautomeric mixture and the subsequent methylated as well as benzylated compounds have been obtained as a single regioisomer. The synthesised N‐methyl Imidazole derivative is a potential structural unit towards biologically active compounds.

A regioselective α-heteroarylation followed by deoxygenation towards the synthesis of variety of azine triazole from simple azine N-oxides derivatives and N-tosyl-1,2,3-triazoles has been described.

The reactivity of α-azidochalcones has been explored for the preparation of highly substituted oxazoles via a 2H-azirine intermediate. The azidochalcones, when treated with potassium thiocyanate in the presence of potassium persulfate, lead to 2,4,5-trisubstituted oxazoles in good yields. Incidentally, 2-aminothiazoles are the products when ferric nitrate is employed instead of persulfate in the above reaction.

Base Free Regioselective Synthesis of -Triazolylazine Derivatives. -A facile regioselective -heteroarylation/deoxygenation reaction allows the synthesis of -triazolylazines from azine N-oxides and N-tosyltriazoles. -(HARISHA, M. B.; NAGARAJ, M.; MUTHUSUBRAMANIAN*, S.; BHUVANESH, N.; RSC Adv. 6 (2016) 63, 58118-58124, http://dx.