Preliminary studies of surface water quality in Damodar River basin (West Bengal, India)

The purpose of the research was to study the main parameters of the chemical composition of surface water and its quality in the Damodar River basin near the Durgapur city where the surface water is used for water supply of the local community. During fieldwork water of the Damodar River, its tributaries (Tamla River and small streams - receivers of industrial wastewater and drainage water) and the Maithon Reservoir was sampled from the layer 0.1-0.5 m. Preliminary studies have shown that the main pollutants in the study area are organic compounds, ammonium, phosphate and fluoride ions. Deterioration of water quality in some sampling points is connected with a low content of dissolved oxygen and high concentrations of nitrite, chloride and sulfate ions

Preliminary studies of surface water quality in Damodar River basin (West Bengal, India)

The purpose of the research was to study the main parameters of the chemical composition of surface water and its quality in the Damodar River basin near the Durgapur city where the surface water is used for water supply of the local community. During fieldwork water of the Damodar River, its tributaries (Tamla River and small streams - receivers of industrial wastewater and drainage water) and the Maithon Reservoir was sampled from the layer 0.1-0.5 m. Preliminary studies have shown that the main pollutants in the study area are organic compounds, ammonium, phosphate and fluoride ions. Deterioration of water quality in some sampling points is connected with a low content of dissolved oxygen and high concentrations of nitrite, chloride and sulfate ions

Transition-Metal Free Oxidative Alkynylation of 2‑Oxindoles with Ethynylbenziodoxolone (EBX) Reagents

We report an efficient direct alkynylations of 3-alkyl/aryl 2-oxindoles employing ethynyl-1,2-benziodoxol-3­(1H)-one (EBX) to afford a wide variety of 3-alkynyl-3-alkyl/aryl 2-oxindole under transition-metal free condition. In addition to activated carbonyl compounds <i>viz</i>. 2-oxindole-3-alkylcarboxylates, this direct alkynylations protocol works efficiently on 3-alkyl/aryl 2-oxindols as well thereby widening the scope even further. Eventually, a Pd(0)-catalyzed asymmetric decarboxylative allylation of few products is shown to furnish synthetically viable enantioenriched 2-oxindoles with C-3 quaternary stereocenters