Tamanna Khandelia

• Indian Institute of Technology Guwahati

A cobalt(III)‐catalyzed dual C(sp²)−H/C(sp²)−H activation of 2‐arylimidazopyridines and its annulation with N‐substituted maleimides leads to polycyclic aromatic heterocycles. This sustainable oxidative annulation uses earth‐abundant, less toxic, and cost‐effective cobalt(III) catalyst that complement expensive 2nd and 3rd‐row metals. This oxidativ...

Solvent plays an important role in many chemical reactions. The C−H activation has been one of the most powerful tools in organic synthesis. These reactions are often assisted by solvents which not only provide a medium for the chemical reactions but also facilitate reaching to the product stage. The solvent helps the reaction profile both chemical...

Developed here is a highly fluorescent organic N-O bidentate BF2 complex from isoxazole in the presence of Ru(II) catalyst. Herein, the complexation proceeds via a selective N-O cleavage of the...

Demonstrated here is an external photo‐sensitizer‐free (auto‐sensitized) singlet oxygen‐enabled solvent‐dependent tertiary hydroxylation and aryl‐alkyl spiro‐etherification of C3‐maleimidated quinoxalines. Such “reagent‐less” photo‐oxygenation at Csp³‐H and etherification involving Csp³‐H/Csp²‐H are unparalleled. Possibly, the highly π‐conjugated N...

A visible light-driven di-functionalization of maleimide with disulfide and in situ-generated singlet oxygen offers selective 1,2-thiohydroxylation under additive-free conditions. Here the disulfide plays the dual role of photo catalyst and...

A Ru(II) catalyzed regioselective Heck-type C-H olefination of isoxazole with unactivated allyl phenyl sulfone is revealed. The solvent DCM offers dual sp2-sp2 C-H activation via an N-directed strategy, leading to ortho-olefinated isoxazoles with exclusive E-selectivity. On the other hand, in DCE solvent, isoxazole serves as the nitrile synthon and...

A Mn(I)-catalyzed site-selective nondirected C3-maleimidation of quinoxaline is established. Herein, the electrophilic C3-metalation precedes over the o-directed strategy to access diversely substituted quinoxaline-appended succinimides. The products undergo PIFA-promoted C(sp2)-C(sp3) spirocyclization via π-electrons drifting from aryls and Select...

A Cu(OTf)2 mediated regioselective de-aromatized aryl-hydroxylation across C(sp2)N bond of 2-aryl quinoxalines and bis-N-arylation of (benz)imidazoles is developed using aryl boronic acids. For dearomative aryl-hydroxylation, the C-center should be electrophilic...

Aldehydes have been widely utilized as an acyl source for the construction of C(sp2)—C(sp2) bonds via cross-dehydrogenative coupling (CDC) in an efficient and sustainable strategy. The aldehyde-based acylation is an important methodology for the synthesis of diaryl ketones, a significant motif in the field of agrochemicals, pharmaceuticals, and dye...

In the field of oil-water separation, carbon nanotubes (CNTs) have been proved as an efficient tool. The development of carbon-based nanotubes has shed bright light on gloomy disasters caused by oil spillage and industrial oily wastewater drainage. CNT is bestowed with many distinctive physicochemical properties such as superhydrophobicity, superol...