A Porphyrin-Based Covalent Organic Framework as Metal-Free Visible-LED-Light Photocatalyst for One-Pot Tandem Benzyl Alcohol Oxidation/Knoevenagel Condensation

Abstract

A porphyrin-based covalent organic framework (COF), namely Porph-UOZ-COF (UOZ stands for the University of Zabol), has been designed and prepared via the condensation reaction of 5,10,15,20-tetrakis-(3,4-dihydroxyphenyl)porphyrin (DHPP) with 1,4-benzenediboronic acid (DBBA), under the solvothermal condition. The solid was characterized by spectroscopic, microscopic, and powder X-ray diffraction techniques. The resultant multifunctional COF revealed an outstanding performance in catalyzing a one-pot tandem selective benzylic C-H photooxygenation/Knoevenagel condensation reaction in the absence of additives or metals under visible-LED-light irradiation. Notably, the catalytic activity of the COF was superior to individual organic counterparts and the COF was both stable and reusable for four consecutive runs. The present approach illustrates the potential of COFs as promising metal-free (photo) catalysts for the development of tandem reactions.

Unleashing the solar revolution: harnessing the power of an ultra-strong tensile strength PGTPP nanocomposite photocatalyst for artificial photosynthesis

“…4, G, P@G, P@TPP, and 1% PGTPP nanocomposite photocatalyst have a crumble-like structure, usual crumble-like structure, rod-like structure, and rod-based crumble structure, which clearly shows that the formation of the high strength 1% PGTPP nanocomposite photocatalyst. 42–46…”

“…4, G, P@G, P@TPP, and 1% PGTPP nanocomposite photocatalyst have a crumble-like structure, usual crumble-like structure, rod-like structure, and rod-based crumble structure, which clearly shows that the formation of the high strength 1% PGTPP nanocomposite photocatalyst. [42][43][44][45][46] Fig. 5 shows the energy dispersive X-ray spectroscopy (EDX) spectra of (a) Aloe vera-derived G, (b) P@G, (c) P@TPP, and (d) 1% PGTPP nanocomposite photocatalyst.…”

Metal–organic frameworks as an efficient Pickering interfacial catalyst for the deacetalization-Knoevenagel tandem reaction

“…In recent decades, tandem reactions have been widely used due to the simplicity of the process and because there is no need to purify intermediate products. [28][29][30][31] Tandem reactions are economically and environmentally beneficial because they can directly obtain complex molecules from relatively simple and easily available raw materials. [32][33][34] Deacetalization-Knoevenagel condensation reactions are typically tandem reactions catalysed by synergistic acid-base active centres, requiring catalysts with spatial isolation of antagonistic acid-base groups, 35 which poses a significant challenge for catalyst preparation.…”

Tandem Photooxidation/Acetalization of Alcohols to Acetals/Ketals with Sulfur‐doped Carbon Nitride

“…It is widely acknowledged that there is a growing need to focus on resource efficiency and on the design of chemical products and processes that are environmentally benign [1–4] . Concurrent tandem catalysis (CTC), which combines two or more mechanistically distinct catalytic reactions into one synthetic operation, has recently gained much attention [5–10] . In CTC, all the reagents are added initially, and the same reaction conditions are maintained during chemical transformations.…”

“…[1][2][3][4] Concurrent tandem catalysis (CTC), which combines two or more mechanistically distinct catalytic reactions into one synthetic operation, has recently gained much attention. [5][6][7][8][9][10] In CTC, all the reagents are added initially, and the same reaction conditions are maintained during chemical transformations. This approach improves the catalyst utilization, process efficiency, substantially decreases waste generation and the number of separation and purification steps.…”