Sustainable Synthesis through Catalyst-Free Photoinduced Cascaded Bond Formation.

The beginning of photochemical reactions revolutionized synthetic chemistry through sustainable practices. This review explores cutting-edge developments in leveraging light-induced processes for generating cascaded C-C and C-hetero bonds without catalysts. Significantly, catalyst-free photoinduced methodologies have garnered considerable attention, especially in the creation of varied heterocyclic frameworks for drug design and the synthesis of natural products.

Photocatalyst- and Transition Metal-Free Light-Induced Borylation Reactions.

The increasing global warming concerns have propelled a surge in the demand for sustainable energy sources within the domain of synthetic organic chemistry. A particularly prominent area of research has been the development of mild synthetic strategies for generating heterocyclic compounds. Heterocyclic compounds containing boron have notably risen to prominence as pivotal reagents in a myriad of organic transformations, showcasing their wide-ranging applicability.

Investigation of the Effect of Solvents on the Synthesis of Aza-flavanone from Aminochalcone Facilitated by Halogen Bonding.

It has been recognized that CBr can give rise to a noncovalent interaction known as halogen bond (XB). CBr was found to catalyze, in terms of XB formation, the transformation of 2'-aminochalcone to aza-flavanone through an intramolecular Michael addition reaction. The impact of XB and the resulting yield of aza-flavanone exhibited a pronounced dependence on the characteristics of the solvent.

Regioselective synthesis of phenanthridine-fused quinazolinones using a 9-mesityl-10-methylacridinium perchlorate photocatalyst.

Herein, we demonstrate a regioselective intramolecular C-N cross-coupling for the synthesis of 14-quinazolino[3,2-]phenanthridin-14-one by using 9-mesityl-10-methylacridinium perchlorate as the visible-light (450-470 nm) photocatalyst. The experiments with BHT, TEMPO, and Stern-Volmer quenching studies helped to rationalize a radical pathway a SET mechanism.

Mapping the research landscape of Covid-19 from social sciences perspective: a bibliometric analysis.

COVID-19 has emerged as a widely researched topic and the academia has taken interest in the effects of COVID-19 in various sectors of human life and society. Most of the bibliometric research addresses scientific contributions in medicine, health, and virology related topics, with very little emphasis on social sciences. Therefore, to address this gap, a bibliometric analysis of research related to COVID-19 in the subject area of social sciences was performed on selected publications from January 2020 to mid-2021.

DDQ in mechanochemical C-N coupling reactions.

2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) is a commonly known oxidant. Herein, we report that DDQ can be used to synthesize 1,2-disubstituted benzimidazoles and quinazolin-4(3)-ones via the intra- and intermolecular C-N coupling reaction under solvent-free mechanochemical (ball milling) conditions. In the presence of DDQ, the intramolecular C(sp)-H amidation of -(2-(arylideneamino)phenyl)--toluenesulfonamides leads to 1,2-disubstituted benzimidazoles and the one-pot coupling of 2-aminobenzamides with aryl/alkyl aldehydes resulted in substituted quinazolin-4(3)-one derivatives in high yields.

Standardization of process parameters for salbutamol sulphate microcapsules coated with cellulose acetate phthalate and computation of in-vitro release kinetics.

Salbutamol sulphate, a bronchodilatatory drug for asthma, is encapsulated by Emulsion-Solvent-Evaporation technique using cellulose acetatephthalate as coating polymeric material. Different process parameters like Stirring Speed, Drug-Polymer Ratio, Solvent-Polymer Ratio, Internal Phase-External Phase Ratio, Effects of Temperature, and of Surfactants have been studied to standardise the process. At optimal condition of process parameters maximum encapsulation efficiency is obtained and microcapsules produced are free flowing and spherical.

In-vitro diffusion kinetics of salbutamol sulphate from microcapsules coated with Eudragit RS 100.

Diffusion plays an important role in controlled release drug delivery system. Salbutamol sulphate, which is a bronchodilatory drug for asthma, was microencapsulated with a polyacrylic resin: Eudragit RS 100. Drug release data have been analyzed according to various release kinetics like Zero order, First order and Higuchi kinetics.