NiO Nanoparticles: An Efficient Catalyst for the Multicomponent One‐Pot Synthesis of Novel Spiro and Condensed Indole Derivatives

Abstract

An efficient catalytic protocol for the synthesis of novel spiro[indoline-3,4′-pyrano[2,3-c]thiazole]carbonitriles and condensed thiazolo[5′′,4′′:5′,6′]pyrano[4′,3′:3,4]furo[2,3-b]indole derivatives is developed in a one-pot three-component approach involving substituted 1H-indole-2,3-diones, activated methylene reagent, and 2-thioxo-4-thiazolidinone under conventional heating and microwave irradiation. This paper describes the use of NiO nanoparticles as catalyst for the synthesis of novel spiro and condensed indole derivatives by Knoevenagel condensation followed by Michael addition. The advantageous features of this methodology are operational simplicity, high yield processing, and easy handling. The particle size of NiO nanoparticle was determined by XRD. After reaction course, NiO nanoparticles can be recycled and reused without any apparent loss of activity.

Metal–Acid Synergy: Hydrodeoxygenation of Anisole over Pt/Al‐SBA‐15

“…The efficacy of small Pt particles for anisole HDO to methoxycyclohexane contrasts with that of phenol HDO over Ni/SiO 2 and 2‐(2‐methoxyphenoxy)‐1‐phenylethanol HDO over Ru/NbOPO 4 for which deoxygenation products dominate; this difference may be a consequence of the greater oxophilicity of Ni and Ru compared to Pt, and hence the retention of Lewis acidic NiO x and RuO x sites under the reaction conditions . DFT calculations and microkinetic analysis suggest that the hydrogenation of the aromatic ring in phenolics is favored over dissociation to benzene .…”

Environ-Economic Synthesis and Characterization of Some New 1,2,4-Triazole Derivatives as Organic Fluorescent Materials and Potent Fungicidal Agents

“…In continuation of our work to develop greener and expeditious protocols for the synthesis of heterocyclic compounds [44][45][46][47][48], herein we wish to report a highly efficient procedure for the synthesis of new substituted-2H-1,2,4-triazole phenol derivatives (4) and spiro (indole-triazole) propanoic acid derivatives (5) using water (containing 1-2 mL of alcohol) by the reaction of 4-chloro-2-nitro aniline (1)/amino acids (1 ) and aromatic aldehydes (2)/1H indole-2,3-diones (2 ), respectively, with thiosemicarbazide (3) yielding triazole (4)/spiro indole-triazole (5) derivatives in high yields and shorter reaction displaying excellent florescent property (Scheme 1).…”

Growth, physical and electrical characterization of nickel oxide thin films prepared by plasma-enhanced atomic layer deposition using nickelocene and oxygen precursors

“…Nickel oxide (NiO) has a wide band gap (~3.6 eV), high transmittance in the visible range and an excellent chemical stability, it is thus widely used in electronic devices [1], solar cells [2,3], super-capacitors [4,5], gas sensors [6][7][8], catalysis [9,10] and so on. So far, most NiO thin films have been prepared by magnetron sputtering [11][12][13], chemical solution [14,15], thermal oxidation [16], and atomic-layer-deposition (ALD) [2,4,5].…”