79 research outputs found
SYNTHESIS AND ANTIOXIDANT ACTIVITY OF NOVEL 2-ARYL SUBSTITUTED BENZOTHIAZOLE DERIVATIVES
Objective: A series of 2-aryl substituted benzothiazole was designed and synthesized with various substituted benzoic acid. 2-mercaptobenzothiazole and thionyl chloride also used to get carbothiaote. The present study was carried to assess the pharmacological potential towards antioxidant activity of 2-aryl substituted benzothiazole derivatives.
Methods: The antioxidant activity of the synthesized compounds was evaluated by 2, 2-diphenyl-1-picrylhydrazyl (DPPH), and superoxide radical scavenging assay methods.
Results: Compounds showed significant radical scavenging potential due to the presence of electron donating substituent.
Conclusion: These indicate that benzothiazole derivatives showed the defence mechanism to prevent formation of excess free radicals
Georeferenced soil information system: assessment of database
Land-use planning is a decision-making process that
facilitates the allocation of land to different uses that
provide optimal and sustainable benefit. As land-use
is shaped by society–nature interaction, in land-use
planning different components/facets play a significant
role involving soil, water, climate, animal (ruminant/
non-ruminant) and others, including forestry
and the environment needed for survival of mankind.
At times these components are moderated by human
interference. Thus land-use planning being a dynamic
phenomenon is not guided by a single factor, but by a
complex system working simultaneously,which largely
affects the sustainability. To address such issues a
National Agricultural Innovation Project (NAIP) on
‘Georeferenced soil information system for land-use
planning and monitoring soil and land quality for
agriculture’ was undertaken to develop threshold
values of land quality parameters for land-use planning
through quantitative land evaluation and crop
modelling for dominant cropping systems in major
agro-ecological sub-regions (AESRs) representing
rice–wheat cropping system in the Indo-Gangetic
Plains (IGP) and deep-rooted crops in the black
soil regions (BSR). To assess the impact of landuse
change, threshold land quality indicator values
are used. A modified AESR map for agricultural landuse
planning is generated for effective land-use planning
Soil information system: use and potentials in humid and semi-arid tropics
The articles presented in this special section emanated from the researches of consortium members of the National Agricultural Innovative Project (NAIP, Component 4) of the Indian Council of Agricultural Research (ICAR), New Delhi. These researches have helped develop a soil information system (SIS). In view of the changing scenario all over the world, the need of the hour is to get assistance from a host of researchers specialized in soils, crops, geology, geography and information technology to make proper use of the datasets. Equipped with the essential knowledge of data storage and retrieval for management recommendations, these experts should be able to address the issues of land degradation, biodiversity, food security, climate change and ultimately arrive at an appropriate agricultural land-use planning. Moreover, as the natural resource information is an essential prerequisite for monitoring and predicting global environmental change with special reference to climate and land use options, the SIS needs to be a dynamic exercise to accommodate temporal datasets, so that subsequently it should result in the evolution of the soil information technology. The database developed through this NAIP would serve as an example of the usefulness of the Consortium and the research initiative of ICAR involving experts from different fields to find out the potentials of the soils of humid and semi-arid bioclimatic systems of the country
Chemoselective C−H Bond Activation: Ligand and Solvent Free Iron-Catalyzed Oxidative C−C Cross-Coupling of Tertiary Amines with Terminal Alkynes. Reaction Scope and Mechanism
Polyaniline-supported metal catalysts for green synthesis
The conducting and redox properties of polyaniline coupled with its easy preparative protocol from inexpensive starting materials, high environmental stability, and easy acid doping/base dedoping has prompted its use as a support to hold metal complexes securely during catalytic reactions. Synthesis of polyaniline-supported palladium, indium, and iron catalysts, their characterization and use in coupling, addition and acylation reactions have been reviewed in this article
Preliminary results of GPS studies for the January 2001 Gujarat earthquake
The Global Positioning System (GPS) provides a valuable tool to monitor crustal deformations, and thereby aids in understanding the complex earthquake mechanisms. After the tragic earthquake that struck the Gujarat region of western India on 26th January 2001, immediate GPS observations were carried out in the area by the GPS team of Indian Institute of Technology Bombay (IITB), for estimating the post-earthquake deformations. Repeat observations of the GPS network were completed in February 2002. The aim was not only to understand the post-earthquake crustal deformation pattern, but also to establish precise GPS control for monitoring crustal dynamics in this earthquake-affected region in the future. The data has been processed and analyzed using scientific GPS data processing software: Bernese and GAMIT. The preliminary results from the analysis of the data from these two epochs, and future plan of work, are presented here. An extensive GPS network is being established in India under the 'National GPS for Geodynamics Programme' by Government of India. A brief overview of this programme is also provided
Carboxyamido/carbene ligated palladium (II) complex: A versatile catalyst for the synthesis of aryl-substituted heteroarenes
Carboxy amido/carbene ligated Pd-complex catalyzed Suzuki-Miyaura cross-coupling of aryl-boronic
acids with heteroaryl bromides is described. The protocol has a broad substrate scope that includes electron-rich,
electron-deficient and sterically hindered arylboronic acids and heteroaryl bromides. The catalytic
activity of the catalyst has been further investigated in the coupling of 2,6-dibromopyridine with
arylboronic acids
A new synthetic approach to pyrrolo[3,2-b]indoles via regioselective formation of pyrrole and intramolecular C[-]N coupling
A new synthetic approach for the synthesis of pyrrolo[3,2-b]indoles has been developed in two steps. First step involves electrophilic iodocyclization of protected 2-alkynylanilines to regioselective formation of pyrroles followed by copper catalyzed intramolecular C[sbnd]N coupling
Palladium complexes containing multidentate phenoxy-pyridyl-amidate ligands: Highly efficient catalyst for Heck coupling of deactivated aryl halides
N,N',N '',O-Tetrafunctional Pd(II) complexes prepared from the easily available amino acids are shown to be highly efficient catalysts for the Heck reaction of deactivated aryl bromides and iodides with high turnover numbers up to ca. 10(4) and moderate activity for the activation of aryl chlorides under phosphine-free conditions
Uridate/pyridyl Pd(II) complexes: Phosphine-free high turnover catalysts for the Heck reaction of deactivated aryl bromides
The synthesis and structure of palladium(II) complexes bearing uridato/pyridyl ligands as an anionic N-donor coordination sites are reported. The complexes have been shown to be highly active catalysts for the Heck reaction of aryl bromides (TON 4.0104e9.1104) and moderate activity for the activation of aryl chlorides under phosphine-free conditions
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