A Cu(ii) complex supported on Fe₃O₄@SiO₂ as a magnetic heterogeneous catalyst for the reduction of environmental pollutants

Abstract

Nitro-aromatic-pollutants are hazardous to people and the environment. In this work, the catalytic potential of CM@SS-BBTU-Cu(ii) has been investigated for reduction of nitro group in aqueous media by NaBH4.

A Sulfonic Acid Polyvinyl Pyridinium Ionic Liquid Catalyzes the Multi-Component Synthesis of Spiro-indoline-3,5′-pyrano[2,3-d]-pyrimidines and -Pyrazines

“…In continuation of our ongoing research [25][26][27][28][29], we herein report on the synthesis of a poly(4-vinyl-pyridinium-N-butyl-sulfonate) material (PVPy-IL-B-SO3H) containing an acidic pyridinium/HSO3 − ionic liquid moiety and its use as an acid catalyst for the preparation of the spirooxoindoles 1c-6c and 1d-8d (Scheme 2) through the three-component reaction of malononitrile with 1-alkylindoline-2,3-diones and 1,3-dialkylpyrimidine-2,4,6(1H,3H,5H)-triones or methyl 5-hydroxy-1H-pyrazole-3-carboxylate under ultrasonic irradiation (US) conditions.…”

“…In continuation of our ongoing research [25][26][27][28][29], we herein report on the synthesis of a poly(4-vinyl-pyridinium-N-butyl-sulfonate) material (PVPy-IL-B-SO3H) containing an acidic pyridinium/HSO3 − ionic liquid moiety and its use as an acid catalyst for the preparation of the spirooxoindoles 1c-6c and 1d-8d (Scheme 2) through the three-component reaction of malononitrile with 1-alkylindoline-2,3-diones and 1,3-dialkylpyrimidine-2,4,6(1H,3H,5H)-triones or methyl 5-hydroxy-1H-pyrazole-3-carboxylate under ultrasonic irradiation (US) conditions. Polymers with acidic protons in their structures and ionic liquid-polymer composites have found applications in fuel cells, in biomedical applications, and as catalysts [30][31][32][33][34] and different methods such as grafting, crosslinking, and functionalization procedures have been developed to produce such materials.…”

Alkyl ammonium hydrogen sulfate immobilized on Fe3O4@SiO2 nanoparticles: a highly efficient catalyst for the multi-component preparation of novel tetrazolo[1,5-a]pyrimidine-6-carboxamide derivatives

“…The new structures have a high binding ability and at the same time increase the stability of the magnetic particles. Thus, the development of new magnetically separable catalysts is a great demand for synthetic chemists 27 – 34 .…”

Ru(II) and Ru(III) complexes containing N‐acylthiourea ligands: Supramolecular structures and synthons, reduction, and reaction pathway of aromatic nitro compounds

“…The benzoylthiourea derivatives have more than one potential atom for coordination with oxygen, nitrogen, and sulfur atoms and thus can act as monodentate, bidentate, or polydentate ligands 11–14 . Recently, transition group metal complexes that are functionalized with aryl or acyl benzoylthiourea derivatives have been affirmed to be extremely effective in the field of catalysis 1,9,14–18 . The reduction of aromatic nitro compounds to aromatic amino compounds is one of the most important reactions in the chemical industry 19,20 because amino compounds are important intermediates in the preparation of agrochemicals, dyes, pigments, and pharmaceuticals 21–23 .…”

“…[11][12][13][14] Recently, transition group metal complexes that are functionalized with aryl or acyl benzoylthiourea derivatives have been affirmed to be extremely effective in the field of catalysis. 1,9,[14][15][16][17][18] The reduction of aromatic nitro compounds to aromatic amino compounds is one of the most important reactions in the chemical industry 19,20 because amino compounds are important intermediates in the preparation of agrochemicals, dyes, pigments, and pharmaceuticals. [21][22][23] Direct hydrogenation of nitro compounds to related amines is an efficient and fundamental strategy.…”