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

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