Herein, we report the green synthesis of copper− zirconium bimetallic nanoparticles (Cu−Zr BNPs) ... more Herein, we report the green synthesis of copper− zirconium bimetallic nanoparticles (Cu−Zr BNPs) from aqueous solutions using Azadirachta indica leaf extract as a reducing and stabilizing agent. The CuO, ZrO 2 NP, and Cu−Zr BNP samples were characterized by X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy, and the morphologies of the samples were analyzed by high-resolution transmission electron microscopy (HR-TEM) with selected area electron diffraction analysis (SAED). The synthesized Cu−Zr BNPs have been employed as efficient catalysts for the selective N-methylation of aromatic and aliphatic amines with dimethyl carbonate. The effect of process conditions on the percentage conversion of benzylamine with dimethyl carbonate as a model reaction has been investigated. The Cu−Zr bimetallic nanoparticle catalytic system in a 1:2 molar ratio was able to convert amines into the corresponding Nmethylated amines with a selectivity up to 91% at 180°C in 4 h. The analysis of catalytic reusability confirmed that the reported heterogeneous catalyst can be used for five consecutive cycles without much loss in activity. Thus, the current protocol can be considered as a simpler, reproducible, and environmentally benign approach for N-methylation of amines.
Current Research in Green and Sustainable Chemistry, 2021
Abstract A benign protocol for the Strecker synthesis of α-aminonitriles in the bifunctional ioni... more Abstract A benign protocol for the Strecker synthesis of α-aminonitriles in the bifunctional ionic liquids has been reported here. The imidazolium based dicationic ionic liquids with Cl−, NO2− and PF6− anions efficiently catalysed the conversion of a variety of aldehydic substrates into corresponding α-aminonitriles upon treatment with aniline and trimethylsilylcyanide. B[MIm]2[PF6]2 provided 97% of the product in a short interval of 30 min with 5 wt% of it. Ionic liquids were recovered efficiently and re-used in the reaction for consecutive 5 cycles without much significant loss in its activity. Thus, the current protocol possesses the advantageous features of being less-hazardous, benign, solvent free and reproducible.
Herein, we report the green synthesis of copper− zirconium bimetallic nanoparticles (Cu−Zr BNPs) ... more Herein, we report the green synthesis of copper− zirconium bimetallic nanoparticles (Cu−Zr BNPs) from aqueous solutions using Azadirachta indica leaf extract as a reducing and stabilizing agent. The CuO, ZrO 2 NP, and Cu−Zr BNP samples were characterized by X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy, and the morphologies of the samples were analyzed by high-resolution transmission electron microscopy (HR-TEM) with selected area electron diffraction analysis (SAED). The synthesized Cu−Zr BNPs have been employed as efficient catalysts for the selective N-methylation of aromatic and aliphatic amines with dimethyl carbonate. The effect of process conditions on the percentage conversion of benzylamine with dimethyl carbonate as a model reaction has been investigated. The Cu−Zr bimetallic nanoparticle catalytic system in a 1:2 molar ratio was able to convert amines into the corresponding Nmethylated amines with a selectivity up to 91% at 180°C in 4 h. The analysis of catalytic reusability confirmed that the reported heterogeneous catalyst can be used for five consecutive cycles without much loss in activity. Thus, the current protocol can be considered as a simpler, reproducible, and environmentally benign approach for N-methylation of amines.
Current Research in Green and Sustainable Chemistry, 2021
Abstract A benign protocol for the Strecker synthesis of α-aminonitriles in the bifunctional ioni... more Abstract A benign protocol for the Strecker synthesis of α-aminonitriles in the bifunctional ionic liquids has been reported here. The imidazolium based dicationic ionic liquids with Cl−, NO2− and PF6− anions efficiently catalysed the conversion of a variety of aldehydic substrates into corresponding α-aminonitriles upon treatment with aniline and trimethylsilylcyanide. B[MIm]2[PF6]2 provided 97% of the product in a short interval of 30 min with 5 wt% of it. Ionic liquids were recovered efficiently and re-used in the reaction for consecutive 5 cycles without much significant loss in its activity. Thus, the current protocol possesses the advantageous features of being less-hazardous, benign, solvent free and reproducible.
Uploads
Papers by Khushboo Verma