CsPbBr₃ perovskite quantum dots as a visible light photocatalyst for cyclisation of diamines and amino alcohols: an efficient approach to synthesize imidazolidines, fused-imidazolidines and oxazolidines

Abstract

We report synthesis of highly stable CsPbBr3 QDs based photocatalysts using dibromoisocyanuric acid (DBI) as benign non-toxic bromide precursor. The QDs were applied as visible light photocatalyst for intramolecular cyclisation...

Stereospecific Single-Pot Route to Chiral Imidazolidines from Aziridines Using a 2D Cu Metal–Organic Framework

“…Here, the activation of alkyl amines proceeds via a radical cation pathway with the formation of an iminium ion as an intermediate. 21,22 When we performed the one-pot reaction in the presence of a radical scavenger TEMPO (1.0 equiv), a substantial decrease in the formation of 3a (<5%) was observed, which indicates the presence of radicals in the reaction system (Table S8). 21 Furthermore, to understand the role of Cu species during the reaction, the density functional theory (DFT) calculations were performed using the Gaussian 09 program.…”

“…However, these processes are associated with the prefunctionalization of substrate and the use of expensive ligands . The synthesis of imidazolidines via aziridine bond cleavage (both C–C and C–N bonds) − is an attractive alternative method for the synthesis of the imidazolidine framework due to the high atom economy. Previously, the synthesis of chiral imidazolidine starting from enantiopure aziridine was reported by Punniyamurthy et al using a homogeneous Cu­(TOf) 2 catalyst with an enantiomeric excess (ee) of 95–99%; however, the method still entails solutions for the use of a chlorinated solvent and issues of catalyst separation and reusability for these reactions (Scheme b).…”

C-H Chalcogenation by a Bromide Rich and Environmentally Benign Orthorhombic CsPbBr3 under Visible Light, Polar Media and Aerobic Condition

“…In recent times, the CsPbBr3 perovskite NCs also have been explored as photocatalysts in organic synthesis. [16][17][18][19][20][21] Photocatalysis has gained interest as a green and sustainable alternative to traditional chemical synthesis methods, which often rely on high temperatures and/or harsh chemicals. [22][23] However, there are still some challenges associated with CsPbBr3 perovskite, such as its long-term stability 24 and the toxicity of lead.…”

Size and Shape Tunability of Cesium Lead Bromide Nanocrystals by Pb(II) Counter Anions

“…1 They exhibit great promise for diverse applications, including solar cells, [2][3][4][5] light-emitting diodes, [6][7] lasers, 8-9 photodetectors, [10][11] , and visible light photocatalysis in organic synthesis. [12][13][14][15][16][17] Furthermore, these perovskite materials have been widely applied as highly effective photocatalysts in various processes, including hydrogen (H2) generation, carbon dioxide (CO2) reduction, nitrogen (N2) fixation, and dye degradation, among other applications. [18][19][20][21] These properties are primarily attributed to the high absorption coefficient, adjustable bandgap, and remarkable photoluminescence quantum yield exhibited by CsPbBr3 perovskites.…”