Chloromethylated polystyrene supported copper (II) bis–thiazole complex: Preparation, characterization and its application as a heterogeneous catalyst for chemoselective and homoselective synthesis of aryl azides

Abstract

This work deals the synthesis of aryl azides catalyzed by heterogeneous copper (II) complex of 3,5–bis (2–benzothiazolyl) pyridine, [Cu (II)(BTP)(OTf)2], immobilized on chloromethylated polystyrene, [Cu (II)(BTP)(OTf)2]@CMP. The prepared catalyst was characterized by different analytical techniques such as X‐ray diffraction (XRD), thermogravimetric analysis (TGA), field emission scanning electron microscopy (SEM), energy dispersive X–ray spectroscopy (EDX), elemental analysis, and FT‐IR and UV–Vis spectroscopic methods. This catalytic system showed excellent activity in the synthesis of aryl azides by the reaction of aryl halides with sodium azide in the presence of catalytic amounts of [Cu (II)(BTP)(OTf)2]@CMP. Moreover, this unique catalyst could be recovered easily and reused several times without any considerable loss of its catalytic activity.

SEM morphological analysis of irradiated polystyrene film doped by a Schiff base containing a 1,2,4-triazole ring system

“…3) indicate the appearance of new bands related to nitrogen and oxygen from Schiff base 4. The assignment of peaks in the EDX patterns for the PS films is consistent with reported assignments [22][23][24].…”

“…Heterocycles containing the 1,2,4-triazole moiety have various biological activities [18][19][20][21]. The Schiff base enhances the photostability of PS against photodegradation that is a continuation of previously reported work in the area of polymers [22][23][24][25][26][27][28][29][30][31][32][33]. The elemental composition of the PS films was measured by energy-dispersive X-ray (EDX) spectroscopy, and the surface morphology was analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM).…”

Construction of Cu(DMF)2Cl Active Sites for Gas–Solid Acetylene Dimerization: Effects of DMF Ligand and Catalytic Mechanism

“…However, for the Cu-15DMF/ AC catalyst, the catalytic surface has experienced a lower rate of carbon deposition at around 3.61%, suggesting that DMF addition can effectively mitigate carbon deposition during reaction. 48,49 The impact of DMF ligands on the acetylene adsorption performance of the Cu catalysts was evaluated through C 2 H 2 -TPD (Figure S8). It was observed that the desorption peak area and desorption temperature for Cu/AC catalysts were significantly higher than the other catalysts, indicating that the DMF ligand could decrease the adsorption capacity of acetylene adsorbed on the catalysts, thereby reducing carbon deposition during the reaction.…”

Fe3O4@BNPs‐CPTMS‐Chitosan‐Pd(0) as an Efficient and Stable Heterogeneous Magnetic Nanocatalyst for the Chemoselective Oxidation of Alcohols and Homoselective Synthesis of 5‐Subestituted 1H‐Tetrazoles

“…Another term in organic reactions is chomoselectivity, in which a special functional group reacts preferentially to other functional groups . To investigate the chemeselectivity, equal amounts of benzyl alcohol and octanol were subjected to oxidation with Fe 3 O 4 @BNPs‐CPTMS‐Chitosan‐Pd(0) under the optimized reaction conditions (Scheme ).…”

“…Homoselectivity is a term used in certain reactions where two or more identical functional groups there are in a molecule, but only one of them is reacted selectively during the reaction …”