Light Induced Diastereoselective Ketoesterification To Access 6,5-Fused Tetrahydrobenzofuranones in Batch and Continuous Flow Conditions.

Ketoesterification stands as a pivotal technique in organic synthesis, particularly due to its essential role in the construction of numerous natural products and bioactive compounds. In this study, we have successfully accomplished a visible-light-induced cyclization and diastereoselective direct ketoesterification of cyclohexadienones, facilitating access to cis 6,5-fused tetrahydrobenzofuranone derivatives. The utilization of TEMPO radical quenching experiments has provided insights, suggesting an ionic mechanism underlying this methodology.

Regioselective Radical Cascade Cyclizations of Alkyne-Tethered Cyclohexadienones with Chalcogenides under Visible-Light Catalysis.

Herein, we demonstrated a silver/KSO-mediated highly regio- and diastereoselective 6/5- trig radical cascade cyclization of alkyne-tethered cyclohexadienones with sulfonyl hydrazides or sodium sulfinates and subsequent selenation to access 6,6-dihydrochromenone and 6,5-fused tetrahydro benzofuranone derivatives. This reaction protocol features high functional group compatibility and has a wide substrate scope providing a variety of dihydrochromenones and tetrahydro benzofuranone derivatives in good to excellent yields. The reaction proceeds via the attack of a sulfonyl radical to alkyne over the activated Michael acceptor.

Influence of salinity on the meiofaunal distribution in a hypersaline lake along the southeast coast of India.

The present study highlights that seasonal salinity variability plays a significant role in meiobenthic distribution with special reference to nematode assemblages. Sediment and water samples were collected from Pulicat Lake, a hypersaline lake along the southeast coast of India during two seasons (Southwest Monsoon (SWM) and Northeast Monsoon (NEM)). Based on the salinity distribution, the lake is categorized into four regions, viz.

Characterization of plastic debris from surface waters of the eastern Arabian Sea-Indian Ocean.

The quantity of floating plastic debris (FPD) is continuously being increased in the oceans. To assess their size, structure, and composition along the eastern Arabian Sea (EAS), FPD samples were collected by using a surface plankton net. The microplastic size fraction (0.

Blooming of Gonyaulax polygramma along the southeastern Arabian Sea: Influence of upwelling dynamics and anthropogenic activities.

The influence of upwelling on the phytoplankton community was examined during the upwelling-relaxation period in the southeastern Arabian Sea. Elevated upwelling intensity during the summer monsoon season of 2016 resulted in the re-suspension of harmful dinoflagellates into the surface water. Further, the surplus of phosphorus (P) inputs into the coastal waters from estuarine runoff during the upwelling-relaxation period induced blooming of Gonyaulax polygramma (4.

Loricate ciliates as an indicator of eutrophication status in the estuarine and coastal waters.

Owing to the environmental sensitivity of ciliate species, the monitoring and assessment of these communities can indicate the health of the aquatic environment. Sampling for loricate ciliates was carried out during different seasons at three different locations in the estuarine and coastal waters of Kochi, Southwest coast of India. The loricate ciliate community comprising of 27 species belonging to 10 genera revealed significant differences among the three sampling locations.

Microplastics in the benthic invertebrates from the coastal waters of Kochi, Southeastern Arabian Sea.

This study examined microplastic particles present in the benthic invertebrates Sternaspis scutata, Magelona cinta (deposit feeders) and Tellina sp. (suspension feeder) from the surface sediments of off-Kochi, southwest coast of India. The microplastic particles and thread-like fibres detected in these organisms were identified to be polystyrene by using DXR Raman microscope.

An analysis of association of components of yield and oil in safflower (Carthamus tinctorius L.).

Inter-relationships of various component characters with yield and oil content were analysed using 215 entries of safflower from India and U.S.A.