A novel, visible-light-mediated method for the synthesis of 2-substituted benzothiazoles from thiophenols and alkyl/aryl nitriles in the presence of eosin Y under air atmosphere is disclosed.
A regioselective tandem approach for annulated napthyridines/isoquinolines embedded with the phosphine oxide group under mild reaction conditions has been achieved in good to excellent yields. The designed strategy involves the triflateinduced formation of new C sp 3 −P and C sp 2 −N bond formation in one pot. This protocol was also well tolerated for the construction of densely functionalized organo-phosphorylated chromenes in good yields. Further, phosphino-derived sulfamethazine and sulfamethoxazole drugs were also successfully synthesized in good yields. The mechanistic studies revealed that the ionic pathway and the formation of regioselective 6-endo dig cyclized products were confirmed through X-ray crystallographic studies. Interestingly, photophysical studies of selectivity selected compounds revealed their stimulating fluorescence properties.
An experiment was undertaken to analyse the impact of fluctuating climateon growth and development of mulberry cuttings (T-1), saplings (T-2), wild tree (T-3) and cultivated tree (control) of the same variety (Chakmajra). Various growth parameters like survivability percentage, rooting percentage, number of sprouted cuttings, fresh and dry weight of leaves and moisture retention capacity (MRC) were studied. Poonch district experienced temperature (temp.) of 3.8 to 15.3 ºC, relative humidity (RH) of 56 to 62%, rainfall 560 to 87mm and snowfall of 213 to 461mm during January to April, 2022. Maximum survivability and rooting percentage of 85.6% in case of T-1 and least 60% in T-3. Whereas, maximum values of longest shoot length and thickest diameter was recorded in T-2 as 16.2 cm and 1.1 cm respectively. T-2 showed more positive results in terms of total no. of available fresh leaves (09), fresh (64g) and dry (16g) weight of the shoots, no. of primary roots (78), MRC (86.2%) and diameter of shoot (1.1cm). Therefore, it can be concluded that farmers should plant saplings directly to save time and resources as it showed better results in terms of various traits under the agro-climatic conditions of Poonch district.
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