Biodegradable and economically viable choline chloride-FeCl 2. H 2 O deep eutectic solvent (DES), was synthesized and successfully utilized as a catalyst and reaction medium for the selective oxidation of aromatic methyl groups to aldehydes. To demonstrate the synthetic potential of this protocol, the reaction was scaled up to the gram scale. The DES could be reused up to four times without considerable effect on the yield of the reaction. The key features of the protocol that qualify the process as green include the ambient reaction temperatures, easy isolation of the products, higher yields, recyclability of the catalyst, and reactions without the use of conventional organic solvents.

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This article presents two highly fluorescent donor-π-acceptor (D-π-A) moieties containing an electron-donating carbazole and phenothiazine donors fused with electron-withdrawing pyrrolo-quinoline acceptor dyes, PQC and PQPT . We also discussed the polymerization and film-forming process of dye PQC and PQPT doped in poly (methyl methacrylate) (PMMA) and polystyrene (PS) polymer to find their optical applications in polymer-based technology. We investigated the fluorescent properties of dyes PQC and PQPT from 0.01 to 1 wt% in poly(methyl methacrylate) (PMMA). We also investigated the changes in the spectrum shape and shift in wavelength with changes in poly(methyl methacrylate) (PMMA), polystyrene (PS), and TiO 2 doped in polystyrene (PS/TiO 2 ). The analysis of surface morphology of prepared polymer samples was done with the help of a scanning electron microscope. The thermal and photostability of synthesized dyes in poly (methyl methacrylate) (PMMA), polystyrene (PS), and TiO 2 doped in polystyrene (PS/TiO 2 ) were investigated to get detailed information owing to the application of fluorescent polymers in the field of optoelectronic, nanohybrid coatings in solar concentrators, etc. Graphical Abstract

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We prepared a commercially viable Deep Eutectic Solvent (DES) based on Choline Chloride‐Urea‐copper acetate for the first time. It mediates the homocoupling of terminal alkynes, using air as an oxidant. Water is the only by‐product of the entire process. The method avoids ligands, bases, oxidants, and costly palladium catalysts, which qualifies the process greener than ever. The DES can be reused at least three times without affecting the reaction yield significantly. The key features of the protocol that qualify the process as green include the ambient reaction temperatures, lesser use of conventional organic solvents in the reaction, higher yields, and easy product isolation qualify the protocol as a green process.