Study of avifaunal diversity is one of the reliable ecological attribute by which ecosystem structure, services and health are indicated from time to time. The present study was carried out in the shoreline Ecotone region of Henry’s Island in Sundarban Biosphere Reserve from South 24 Parganas, West Bengal during early winter months of 2021. A total of 63 avian species belonging to 31 different families and 13 orders were recorded in the winter season following standard field ecology protocols and then foraging guilds were analyzed. Family-wise relative diversity index has been constructed with standard mathematical equation. Six major categories with other seven overlapping foraging guilds were also observed in the present study. Most bird species were found to be insectivorous followed by other foraging guilds.
A newer synthetic protocol has been developed to synthesize α-oxyalkyl ketones from vinyl azides under transition metal free reaction conditions. The reaction proceeds in the presence of organic photoredox catalyst Rose Bengal, an oxidant tert-butyl hydroperoxide (TBHP), and ethers. A broad range of substituted vinyl azides were found to react smoothly upon visible-light irradiation, which readily furnished the related products. Several controlled experiments have been done to suggest a probable mechanism. The process is initiated by radical addition to vinyl azide, which triggers a cascade fragmentation mechanism driven by the loss of dinitrogen and the stabilized ether radical ultimately produces the α-oxyalkyl ketones. This method provides a simple, mild, straight forward, novel paradigm to prepare α-oxyalkyl ketones.
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