Browsing by Author "Prince Kumar Gupta"

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Enhancement in electrical and magnetic properties with Ti-doping in Bi0.5La0.5Fe0.5Mn0.5O3
(American Institute of Physics Inc., 2017) Rahul Singh; Prince Kumar Gupta; Shiv Kumar; Amish G. Joshi; A.K. Ghosh; S. Patil; Sandip Chatterjee
In this investigation, we have synthesized Bi0.5La0.5Fe05Mn0.5-xTixO3 (where x = 0 and 0.05) samples. The Rietveld refinement of X-ray diffraction (XRD) patterns shows that the systems crystallize in the orthorhombic phase with the Pnma space group. The observed Raman modes support the XRD results. The appearance of prominent A1-3 and weak E-2 modes in Bi0.5La0.5Fe0.5Mn0.45Ti0.05O3 indicates the presence of chemically more active Bi-O covalent bonds. Ferromagnetism of Bi0.5La0.5Fe0.5Mn0.5O3 is enhanced by Ti doping at the Mn-site, indicating that these particular samples might be interesting for device applications. © 2017 Author(s).
Iodine-catalyzed thioallylation of indoles using Bunte salts prepared from Baylis-Hillman bromides
(Royal Society of Chemistry, 2021) Prince Kumar Gupta; Arvind Kumar Yadav; Anup Kumar Sharma; Krishna Nand Singh
Metal-free iodine-catalyzed regioselective thioallylation of indoles has been accomplished at room temperature using Bunte salts prepared from Baylis-Hillman bromides. The resulting multi-functional C3 thioallylated indoles exhibit ample structural diversity and good functional group tolerance. © The Royal Society of Chemistry 2021.
The Risk Associated with Crop Ecosystem Management and Pesticides Pollution
(Nova Science Publishers, Inc., 2022) Manoj Kumar Chitara; Rajesh Pratap Singh; Prince Kumar Gupta; Dhruv Mishra; Surendra Singh Jatav; Sachin Sharma; Hanuman Singh Jatav
Pesticides are large groups of chemical compounds including herbicides, insecticides, fungicides, nematicides, rodenticides, and plant growth regulators etc., commonly used for crop protection against pests. Indiscriminate utilization of pesticides could adversely impose the risk to food safety, the environment and the living population. Farmers are ignoring the risk associated with pesticides used, safety guidelines, and protective directives in crop management. The improper utilization of pesticides caused the degradation of the quality and fertility of the soil as well as disturbing the nutrient cycling, which leads to heavy metal deposition and toxicity. Excessive exposure of the pesticide to the insect population will be created the development of insect pest resistance, resurgence and decline of the population of the natural enemies. Disposal of unwanted pesticides waste is responsible for the pollution of the water reservoir, groundwater, and pond water sources. The bio-magnification of contaminant cause health associated risk in human beings and animal at different levels of the food chain. In this chapter, we are discussing in detail the risk associated with pesticide application and crop management. © 2022 by Nova Science Publishers, Inc.
Visible Light-Triggered β-Allylation of Indoles Using Baylis-Hillman Bromides
(Wiley-VCH Verlag, 2020) Prince Kumar Gupta; Arvind Kumar Yadav; Krishna Nand Singh
A facile regioselective β-allylation of indoles has been accomplished employing Baylis-Hillman bromides as allyl source under visible light photoredox catalysis in the presence of Ru(bpy)3Cl2.6H2O and blue LED. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Visible-Light-Induced Photocatalytic Trifluoromethylation of Bunte Salts: Easy Access to Trifluoromethylthiolated Synthons
(American Chemical Society, 2022) Neha Sharma Prabhakar; Saurabh Kumar; Prince Kumar Gupta; Krishna Nand Singh
A metal-free visible-light-induced trifluoromethylation of Bunte salts of α-bromoketones/alkyl bromide/benzyl bromides/functionalized allyl (Baylis-Hillman) bromides has been accomplished using Langlois' reagent in the presence of inexpensive eosin Y as a photocatalyst to form the privileged trifluoromethylthiolated synthons. The method is straightforward, operationally simple, and endowed with broad substrate scope and good functional group tolerance. © 2022 American Chemical Society. All rights reserved.