Preparation And Characterization Of g-C3N4 @ L-Arginine As A Highly - Efficient And Recyclable Catalyst For The Synthesis of 1, 4-Dihydropyridine, 4H-Chromene, And 2, 3-Dihydro Quinazoline Derivatives

Abstract

In this work, the nanocatalyst of g-C3N4@L-arginine was prepared that synthesis of it in comparison with the synthesis of other catalysts was convenient; initially, this prepared nanocatalyst was evaluated and verified by FT-IR, EDX, XRD, TGA, and FESEM analysis, and in the next step, the performance of nanocatalyst in the synthesis of 1, 4-dihydropyridine, 4H-chromene, and 2, 3-dihydro quinazoline derivatives were examined with high yield. Properties such as high thermal stability, easy separation of reaction media, use in various multicomponent reactions, and reusability have caused that this novel nanocatalyst was changed into a unique catalyst in its own age.

Tandem oxidative amidation of benzylic alcohols by copper(II) supported on metformin-graphitic carbon nitride nanosheets as an efficient catalyst

“…In Fig. 2 c, alongside the absorbance bands of the g-C 3 N 4 , the peak appears in the range of 2800 cm −1 to 3000 cm −1 was associated with the stretching vibration of the aliphatic C–H in the linker 9 . Figure 2 d illustrates the functionalization of CN–Pr–Br by metformin.…”

“…The procedure utilized for preparation CN was introduced by Tajik et al 9 . Initially, 2 g of as-prepared bulk g-C 3 N 4 and 40 mL of sulfuric acid were poured into a 600 mL beaker and the mixture was stirred for 5 h at 90 °C.…”

“…The tri-s-triazine units in the structure of the g-C 3 N 4 are one of the reasons for catalytic applications of g-C 3 N 4 7 . In this regard, various forms of g-C 3 N 4 including bulk 8 , nanosheets 9 , mesoporous 10 , quantum dot 11 , and nanotubes have been reported 12 . Recently, g-C 3 N 4 in the form of nanosheets has been functionalized covalently or non-covalently by various molecules to improve its properties and applications 13 .…”

“…Functionalization of g-C 3 N 4 is usually accomplished by oxidation/carboxylation, amidation, sulfonation, phosphorylation, polymer grafting, electrostatic interaction, π–π interaction, and hydrogen bonding 13 . Also, various molecules including L-arginine 9 , ferrocene 14 , thiamine 15 , 1,4-butane sultone 16 , 5-bromovaleryl chloride 17 , 1, 3-dibromopropane have been used to functionalized g-C 3 N 4 15 . Metformin (dimethyl biguanide) as a polydentate ligand can be also useful.…”